Found 50 papers in cond-mat
Date of feed: Tue, 19 Sep 2023 00:30:00 GMT

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Antiferromagnetic $\mathbb{Z}_2$ topological metal near the metal-insulator transition in MnS$_2$. (arXiv:2309.08712v1 [cond-mat.mtrl-sci])
Vsevolod Ivanov, Xiangang Wan, Sergey Y. Savrasov

Antiferromagnetic (AFM) semiconductor MnS$_2$ possesses both high-spin and low-spin magnetic phases that can be reversibly switched by applying pressure. With increasing pressure, the high-spin state undergoes pressure-induced metalization before transforming into a low-spin configuration, which is then closely followed by a volume collapse and structural transition. We show that the pressure driven band inversion is in fact topological, resulting in an antiferromagnetic $\mathbb{Z}_2$ topological metal (Z2AFTM) phase with a small gap and a Weyl metal phase at higher pressures, both of which precede the spin-state crossover and volume collapse. In the Z2AFTM phase, the magnetic order results in a doubling of the periodic unit cell, and the resulting folding of the Brillouin zone leads to a $\mathbb{Z}_2$ topological invariant protected by the persisting combined time-reversal and half-translation symmetries. Such a topological phase was proposed theoretically by Mong, Essin, and Moore in 2010 for a system with AFM order on a face-centered cubic (FCC) lattice, which until now has not been found in the pool of real materials. MnS$_2$ represents a realization of this original proposal through AFM order on the Mn FCC sublattice. A rich phase diagram of topological and magnetic phases tunable by pressure, establishes MnS$_2$ as a candidate material for exploring magnetic topological phase transitions and for potential applications in AFM spintronics.


2D Ambipolar Vertical Transistors as Control-free Reconfigurable Logic Devices. (arXiv:2309.08746v1 [physics.app-ph])
Zijing Zhao, Shaloo Rakheja, Wenjuan Zhu

As transistor footprint scales down to sub-10 nm regime, the process development for advancing to further technology nodes has encountered slowdowns. Achieving greater functionality within a single chip requires concurrent development at the device, circuit, and system levels. Reconfigurable transistors possess the capability to transform into both n-type and p-type transistors dynamically during operation. This transistor-level reconfigurability enables field-programmable logic circuits with fewer components compared to conventional circuits. However, the reconfigurability requires additional polarity control gates in the transistor and potentially impairs the gain from a smaller footprint. In this paper, vertical transistors with ambipolar MoTe2 channels are fabricated using the transfer-metal method. The efficient asymmetric electrostatic gating in source and drain contacts gives rise to different Schottky barriers at the two contacts. Consequently, the ambipolar conduction is reduced to unipolar conduction due to different Schottky barrier widths for electrons and holes. The current flow direction determines the preferred carrier type. Temperature-dependent measurements reveal the Schottky barrier-controlled conduction in the vertical transistors and confirm different Schottky barrier widths with and without electrostatic gating. Without the complexity overhead from polarity control gates, control-free vertical reconfigurable transistors promise higher logic density and lower cost in future integrated circuits.


Surface barrier effect as evidence of chiral soliton lattice formation in chiral dichalcogenide CrTa$_{3}$S$_{6}$ crystals. (arXiv:2309.08750v1 [cond-mat.mtrl-sci])
K. Mizutani, J. Jiang, K. Monden, Y. Shimamoto, Y. Kousaka, Y. Togawa

The formation of chiral magnetic soliton lattice (CSL) is investigated in monoaxial chiral dichalcogenide CrTa$_{3}$S$_{6}$ crystals in terms of a surface barrier, which prevents a penetration of chiral solitons into the system and is an intrinsic origin of hysteresis for the continuous phase transition of nucleation-type, as discussed in the system of quantized vortices in type-II superconductors. The magnetoresistance (MR) was examined with microfabricated platelet samples in different dimensions with regard to the $c$-axis direction of the crystal. The CSL formation was confirmed by the discrete MR changes, reflecting the number of chiral solitons, as well as by the presence of surface barrier, recognized as a fixed ratio of critical magnetic fields during the hysteresis field cycle. We also argue the influence of the surface barrier in the bulk CrTa$_{3}$S$_{6}$ crystals.


Physics of the Majorana-superconducting qubit hybrids. (arXiv:2309.08758v1 [cond-mat.mes-hall])
D. B. Karki, K. A. Matveev, Ivar Martin

Manipulation of decoupled Majorana zero modes (MZMs) could enable topologically-protected quantum computing. However, the practical realization of a large number of perfectly decoupled MZMs needed to perform nontrivial quantum computation has proven to be challenging so far. Fortunately, even a small number of imperfect MZMs can be used to qualitatively extend the behavior of standard superconducting qubits, allowing for new approaches for noise suppression, qubit manipulation and read-out. Such hybrid devices take advantage of interplay of Cooper pair tunneling, coherent single electron tunneling, and Majorana hybridization. Here we provide a qualitative understanding of this system, give analytical results for its ground state energy spanning full parameter range, and describe potential sensing applications enabled by the interplay between Majorana and Cooper pair tunneling.


Topological spin Hall effect in antiferromagnets. (arXiv:2309.08763v1 [cond-mat.mes-hall])
Amir N. Zarezad, Józef Barnaś, Anna Dyrdał, Alireza Qaiumzadeh

We investigate topological Hall effects in a metallic antiferromagnetic (AFM) thin film and/or at the interface of an AFM insulator-normal metal bilayer with a single skyrmion in the diffusive regime. To determine the spin and charge Hall currents, we employed a Boltzmann kinetic equation with both spin-dependent and spin-flip scatterings. The interaction between conduction electrons and static skyrmions is included in the Boltzmann equation via the corresponding emergent magnetic field arising from the skyrmion texture. We compute intrinsic and extrinsic contributions to the topological spin Hall effect and spin accumulation, induced by an AFM skyrmion. We show that although the spin Hall current vanishes rapidly outside the skyrmion, the spin accumulation can be finite at the edges far from the skyrmion, provided the spin diffusion length is longer than the skyrmion radius. In addition, We show that in the presence of a spin-dependent relaxation time, the topological charge Hall effect is finite and we determine the corresponding Hall voltage. Our results may help to explore antiferromagnetic skyrmions by electrical means in real materials.


Engineering chiral spin interactions with Rydberg atoms. (arXiv:2309.08795v1 [physics.atom-ph])
Elena Kuznetsova, S. I. Mistakidis, Seth T. Rittenhouse, Susanne F. Yelin, H. R. Sadeghpour

We propose to simulate the anisotropic and chiral Dzyaloshinskii-Moriya (DM) interaction with Rydberg atom arrays. The DM Hamiltonian is engineered in a one-dimensional optical lattice or trap array with effective long-range Rydberg spins, interacting indirectly via a mobile mediator Rydberg atom. A host of XXZ and DM Hamiltonians can be simulated with out-of-phase sign periodic coupling strengths; for initial states in a stationary condensate, the DM interaction vanishes. This theory allows for determination of the DM interaction (DMI) vector components from first principles. The inherent anisotropy of the Rydberg-Rydberg interactions, facilitates the DMI coupling to be tuned so as to be comparable to the XXZ interaction. Our results make plausible the formation of non-trivial topological spin textures with Rydberg atom arrays.


Investigation of the Anomalous and Topological Hall Effects in Layered Monoclinic Ferromagnet Cr$_{2.76}$Te$_4$. (arXiv:2309.08898v1 [cond-mat.mtrl-sci])
Shubham Purwar, Achintya Low, Anumita Bose, Awadhesh Narayan, S. Thirupathaiah

We studied the electrical transport, Hall effect, and magnetic properties of monoclinic layered ferromagnet Cr$_{2.76}$Te$_4$. Our studies demonstrate Cr$_{2.76}$Te$_4$ to be a soft ferromagnet with strong magnetocrystalline anisotropy. Below 50 K, the system shows an antiferromagnetic-like transition. Interestingly, between 50 and 150 K, we observe fluctuating magnetic moments between in-plane and out-of-plane orientations, leading to non-coplanar spin structure. On the other hand, the electrical resistivity data suggest it to be metallic throughout the measured temperature range, except a $kink$ at around 50 K due to AFM ordering. The Rhodes-Wohlfarth ratio $\frac{\mu_{eff}}{\mu_{s}}=1.89 (>1)$ calculated from our magnetic studies confirms that Cr$_{2.76}$Te$_4$ is an itinerant ferromagnet. Large anomalous Hall effect has been observed due to the skew-scattering of impurities and the topological Hall effect has been observed due to non-coplanar spin-structure in the presence of strong magnetocrystalline anisotropy. We examined the mechanism of anomalous Hall effect by employing the first principles calculations.


Diminishing Mott gap by doping electrons through depositing one monolayer thin film of Rb on Ca$_{2}$CuO$_{2}$Cl$_{2}$. (arXiv:2309.08921v1 [cond-mat.supr-con])
Han Li, Zhaohui Wang, Shengtai Fan, Huazhou Li, Huan Yang, Hai-Hu Wen

Understanding the doping evolution from a Mott insulator to a superconductor probably holds the key for resolving the mystery of unconventional superconductivity in copper oxides. To elucidate the evolution of the electronic state starting from the Mott insulator, we dose the surface of the parent phase Ca$_{2}$CuO$_{2}$Cl$_{2}$ by depositing one monolayer thin film of Rb atoms which are supposed to donate electrons to the CuO$_{2}$ planes underneath. We successfully achieved the Rb thin films with periodic structures, and the scanning tunneling microscopy or spectroscopy (STM or STS) measurements on the surface show that the Fermi energy is pinned within the Mott gap but more close to the edge of the charge transfer band (CTB). However, the electron doping does not reduce the spectra weight of the upper Hubbard band (UHB) for the double occupancy as expected from the rigid model, but instead increase it; meanwhile, further doping will create a new wide spread in gap states derivative from the UHB, and the Mott gap will be significantly diminished. Our results provide new clues to understand the strong correlation effect of parent Mott insulators for cuprates and shed new light on the origin of high-temperature superconductivity.


Emergent phases in graphene flat bands. (arXiv:2309.08938v1 [cond-mat.mes-hall])
Saisab Bhowmik, Arindam Ghosh, U. Chandni

Electronic correlations in two-dimensional materials play a crucial role in stabilising emergent phases of matter. The realisation of correlation-driven phenomena in graphene has remained a longstanding goal, primarily due to the absence of strong electron-electron interactions within its low-energy bands. In this context, magic-angle twisted bilayer graphene has recently emerged as a novel platform featuring correlated phases favoured by the low-energy flat bands of the underlying moir\'e superlattice. Notably, the observation of correlated insulators and superconductivity has garnered significant attention, leading to substantial progress in theoretical and experimental studies aiming to elucidate the origin and interplay between these two phases. A wealth of correlated phases with unprecedented tunability was discovered subsequently, including orbital ferromagnetism, Chern insulators, strange metallicity, density waves, and nematicity. However, a comprehensive understanding of these closely competing phases remains elusive. The ability to controllably twist and stack multiple graphene layers has enabled the creation of a whole new family of moir\'e superlattices with myriad properties being discovered at a fast pace. Here, we review the progress and development achieved so far, encompassing the rich phase diagrams offered by these graphene-based moir\'e systems. Additionally, we discuss multiple phases recently observed in non-moir\'e multilayer graphene systems. Finally, we outline future opportunities and challenges for the exploration of hidden phases in this new generation of moir\'e materials.


Transverse structural modulation in nematic SrAl$_4$ and elucidation of its origin in the BaAl$_4$ family of compounds. (arXiv:2309.08959v1 [cond-mat.str-el])
Sitaram Ramakrishnan, Surya Rohith Kotla, Hanqi Pi, Bishal Baran Maity, Jia Chen, Jin-Ke Bao, Zhaopeng Guo, Masaki Kado, Harshit Agarwal, Claudio Eisele, Minoru Nohara, Leila Noohinejad, Hongming Weng, Srinivasan Ramakrishnan, Arumugam Thamizhavel, Sander van Smaalen

At ambient conditions SrAl$_4$ adopts the BaAl$_4$ structure type with space group $I4/mmm$. It undergoes a charge-density-wave (CDW) transition at $T_{CDW}$ = 243 K, followed by a structural transition at $T_{S}$ = 87 K. Temperature-dependent single-crystal X-ray diffraction (SXRD) leads to the observation of incommensurate superlattice reflections at $\mathbf{q} = \sigma\,\mathbf{c}^{*}$ with $\sigma = 0.1116$ at 200 K. The CDW has orthorhombic symmetry with the superspace group $Fmmm(0\,0\,\sigma)s00$, where $Fmmm$ is a subgroup of $I4/mmm$ of index 2. Atomic displacements represent a transverse wave, and they are mainly along one of the diagonal directions of the $I$-centered unit cell. The breaking of fourfold rotational symmetry is indicative of the presence of nematic order in the material. The orthorhombic phase realized in SrAl$_4$ is analogous to that found in EuAl$_4$, albeit with the presence of higher order satellite reflections (up to $m = 3$) and a shorter modulation wave vector. A possible non-trivial band topology has prevented the determination by density functional theory (DFT) of the mechanism of CDW formation. However, DFT reveals that Al atoms dominate the density of states near the Fermi level, thus, corroborating the SXRD measurements. SrAl$_4$ remains incommensurately modulated at the structural transition, where the symmetry lowers from orthorhombic to $\mathbf{b}$-unique monoclinic. We have identified a simple criterion, that correlates the presence of a phase transition with the interatomic distances. Only those compounds $X$Al$_{4-x}$Ga$_x$ ($X$ = Ba, Eu, Sr, Ca; $0 < x <4$) undergo phase transitions, for which the ratio $c/a$ falls within the narrow range $2.51 < c/a < 2.54$.


Operando Insights on the Degradation Mechanisms of Rhenium doped Molybdenum Disulfide Nanocatalysts for Electrolyzer Applications. (arXiv:2309.08977v1 [physics.app-ph])
Raquel Aymerich-Armengol, Miquel Vega-Paredes, Andrea Mingers, Luca Camuti, Jeeung Kim, Jeongwook Bae, Ilias Efthimiopoulos, Rajib Sahu, Filip Podjaski, Martin Rabe, Christina Scheu, Joohyun Lim, Siyuan Zhang

MoS2 nanostructures are promising catalysts for proton-exchange-membrane (PEM) electrolyzers to replace expensive noble metals. Their broadscale application demands high activity for the hydrogen evolution reaction (HER) as well as good durability. Doping in MoS2 is commonly applied to enhance the HER activity of MoS2-based nanocatalysts, but the effect of dopants in the electrochemical and structural stability is yet to be discussed. Herein, we correlate operando electrochemical measurements to the structural evolution of the materials down to the nanometric scale by identical location electron microscopy and spectroscopy. Different degradation mechanisms at first electrolyte contact, open circuit stabilization and HER conditions are identified for MoS2 nanocatalysts with and without Rhenium doping. Our results demonstrate that doping in MoS2 nanocatalysts can not only improve their HER activity, but also their stability. Doping of MoS2-based nanocatalysts is validated as a promising strategy to follow for the continuous improvement of high performance and durable PEM electrolyzers.


Electronic and Topological Properties of a Topological Insulator Thin Film Sandwiched between Ferromagnetic Insulators. (arXiv:2309.09014v1 [cond-mat.mes-hall])
Piotr Pigoń, Anna Dyrdał

We consider a thin film of a topological insulator (TI) sandwiched between two ferromagnetic (FM) layers. The system is additionally under an external gate voltage. The surface electron states of TI are magnetized due to the magnetic proximity effect to the ferromagnetic layers. The magnetization of ferromagnetic layers can be changed by applying an external magnetic field or by varying thickness of the topological insulator (owing to the interlayer exchange coupling). The change in the magnetic configuration of the system affects the transport properties of the surface electronic states. Using the Green function formalism, we calculate spin polarization, anomalous Hall effect, and magnetoresistance of the system. We show, among others, that by tuning the gate voltage and magnetizations of the top and bottom FM layers, one can observe the topological transition to the anomalous quantum Hall state.


Dynamical Phonons Following Electron Relaxation Stages in Photo-excited Graphene. (arXiv:2309.09076v1 [cond-mat.mtrl-sci])
Nina Girotto, Dino Novko

Ultrafast electron-phonon relaxation dynamics in graphene hides many distinct phenomena, such as hot phonon generation, dynamical Kohn anomalies, and phonon decoupling, yet still remains largely unexplored. Here, we unravel intricate mechanisms governing the vibrational relaxation and phonon dressing in graphene at a highly non-equilibrium state by means of first-principles techniques. We calculate dynamical phonon spectral functions and momentum-resolved linewidths for various stages of electron relaxation and find photo-induced phonon hardening, overall increase of relaxation rate and nonadiabaticity as well as phonon gain. Namely, the initial stage of photo-excitation is found to be governed by strong phonon anomalies of finite-momentum optical modes along with incoherent phonon production. Population inversion state, on the other hand, allows production of coherent and strongly-coupled phonon modes. Our research provides vital insights into the electron-phonon coupling phenomena in graphene, and serves as a foundation for exploring non-equilibrium phonon dressing in materials where ordered states and phase transitions can be induced by photo-excitation.


Visualizing the Zhang-Rice singlet, molecular orbitals and pair formation in cuprate. (arXiv:2309.09260v1 [cond-mat.supr-con])
Shusen Ye, Jianfa Zhao, Zhiheng Yao, Sixuan Chen, Zehao Dong, Xintong Li, Luchuan Shi, Qingqing Liu, Changqing Jin, Yayu Wang

The parent compound of cuprates is a charge-transfer-type Mott insulator with strong hybridization between the Cu $3d_{\mathrm x^2-y^2}$ and O $2p$ orbitals. A key question concerning the pairing mechanism is the behavior of doped holes in the antiferromagnetic (AF) Mott insulator background, which is a prototypical quantum many-body problem. It was proposed that doped hole on the O site tends to form a singlet, known as Zhang-Rice singlet (ZRS), with the unpaired Cu spin. But experimentally little is known about the properties of a single hole and the interplay between them that leads to superconductivity. Here we use scanning tunneling microscopy to visualize the electronic states in hole-doped $\mathrm{Ca_2CuO_2Cl_2}$, aiming to establish the atomic-scale local basis for pair formation. A single doped hole is shown to have an in-gap state and a clover-shaped spatial distribution that can be attributed to a localized ZRS. When the dopants are close enough, they develop delocalized molecular orbitals with characteristic stripe- and ladder-shaped patterns, accompanied by the opening of a small gap around the Fermi level ($E_{\mathrm F}$). With increasing doping, the molecular orbitals proliferate in space and gradually form densely packed plaquettes, but the stripe and ladder patterns remain nearly the same. The low-energy electronic states of the molecular orbitals are intimately related to the local pairing properties, thus play a vitally important role in the emergence of superconductivity. We propose that the Cooper pair is formed by two holes occupying the stripe-like molecular orbital, while the attractive interaction is mediated by the AF spin background.


Relativistic Douglas-Kroll-Hess Calculations of Hyperfine Interactions within First Principles Multireference Methods. (arXiv:2309.09349v1 [cond-mat.mtrl-sci])
Aleksander L. Wysocki, Kyungwha Park

Relativistic magnetic hyperfine interaction Hamiltonian based on the Douglas-Kroll-Hess (DKH) theory up to the second order is implemented within the ab initio multireference methods including spin-orbit coupling in the Molcas/OpenMolcas package. This implementation is applied to calculate relativistic hyperfine coupling (HFC) parameters for atomic systems and diatomic radicals with valence s or d orbitals by systematically varying active space size in the restricted active space self-consistent field (RASSCF) formalism with restricted active space state interaction (RASSI) for spin-orbit coupling. The DKH relativistic treatment of the hyperfine interaction reduces the Fermi contact contribution to the HFC due to the presence of kinetic factors that regularize the singularity of the Dirac delta function in the nonrelativitic Fermi contact operator. This effect is more prominent for heavier nuclei. As the active space size increases, the relativistic correction of the Fermi contact contribution converges well to the experimental data for light and moderately heavy nuclei. The relativistic correction, however, does not significantly affect the spin-dipole contribution to the hyperfine interaction. In addition to the atomic and molecular systems, the implementation is applied to calculate the relativistic HFC parameters for large trivalent and divalent Tb-based single-molecule magnets (SMMs) such as Tb(III)Pc$_2$ and Tb(II)(Cp$^\text{iPr5}$)$_2$ without ligand truncation using well-converged basis sets. In particular, for the divalent SMM which has an unpaired valence 6s/5d hybrid orbital, the relativistic treatment of HFC is crucial for a proper description of the Fermi contact contribution. Even with the relativistic hyperfine Hamiltonian, the divalent SMM is shown to exhibit strong tunability of HFC via an external electric field (i.e., strong hyperfine Stark effect).


"Smoking gun" signatures of topological milestones in trivial materials by measurement fine-tuning and data postselection. (arXiv:2309.09368v1 [cond-mat.mes-hall])
S.M. Frolov, P. Zhang, B. Zhang, Y. Jiang, S. Byard, S.R. Mudi, J. Chen, A.-H. Chen, M. Hocevar, M. Gupta, C. Riggert, V.S. Pribiag

Exploring the topology of electronic bands is a way to realize new states of matter with possible implications for information technology. Because bands cannot always be observed directly, a central question is how to tell that a topological regime has been achieved. Experiments are often guided by a prediction of a unique signal or a pattern, called "the smoking gun". Examples include peaks in conductivity, microwave resonances, and shifts in interference fringes. However, many condensed matter experiments are performed on relatively small, micron or nanometer-scale, specimens. These structures are in the so-called mesoscopic regime, between atomic and macroscopic physics, where phenomenology is particularly rich. In this paper, we demonstrate that the trivial effects of quantum confinement, quantum interference and charge dynamics in nanostructures can reproduce accepted smoking gun signatures of triplet supercurrents, Majorana modes, topological Josephson junctions and fractionalized particles. The examples we use correspond to milestones of topological quantum computing: qubit spectroscopy, fusion and braiding. None of the samples we use are in the topological regime. The smoking gun patterns are achieved by fine-tuning during data acquisition and by subsequent data selection to pick non-representative examples out of a fluid multitude of similar patterns that do not generally fit the "smoking gun" designation. Building on this insight, we discuss ways that experimentalists can rigorously delineate between topological and non-topological effects, and the effects of fine-tuning by deeper analysis of larger volumes of data.


Towards construction of analog solver of Schroedinger and Ginzburg-Landau equation based on Long Line. (arXiv:2309.09406v1 [cond-mat.mes-hall])
Lukasz Pluszynski, Krzysztof Pomorski

The analog electronic computers are a type of circuitry used to calculate specific problems using the physical relationships between the voltages and currents following classical laws of physics. One specific class of these circuits are computers based on the interactions between passive circuit elements. Models presented by G.Kron in 1945 are the example of using such passive elements to construct a solver for the problem of free quantum particles confined by rectangular potential. Numerical validation of Kron second model is conducted for different shapes of particle confining potential. Model introduced by Kron is generalized by introduction of non-linear resistive elements what implies deformation of Schr\"odinger equation solution into Ginzburg-Landau form.


Anomalous transport of small polarons arises from transient lattice relaxation or immovable boundaries. (arXiv:2309.09509v1 [physics.chem-ph])
Srijan Bhattacharyya, Thomas Sayer, Andrés Montoya-Castillo

Elucidating transport mechanisms and predicting transport coefficients is crucial for advancing material innovation, design, and application. Yet, state-of-the-art calculations are restricted to exact simulations of small lattices with severe finite-size effects or approximate simulations that assume the nature of transport. We leverage recent algorithmic advances to perform exact simulations of the celebrated Holstein model that systematically quantify and eliminate finite-size effects to gain insights into small polaron formation and the nature and timescales of its transport. We perform the first systematic comparison of the performance of two distinct approaches to predict charge carrier mobility: equilibrium-based Green-Kubo relations and nonequilibrium relaxation methods. Our investigation uncovers when and why disparities arise between these ubiquitously used techniques, revealing that the equilibrium-based method is highly sensitive to system topology whereas the nonequilibrium approach requires bigger system sizes to reveal its diffusive region. Contrary to assumptions made in standard perturbative calculations, our results demonstrate that small polarons exhibit anomalous transport and that it manifests transiently, due to nonequilibrium lattice relaxation, or permanently, as a signature of immovable boundaries. These findings have consequences for applications including the utilization of organic polymers in organic electronics and transition metal oxides in photocatalysis.


Extrinsic nonlinear Kerr rotation in topological materials under a magnetic field. (arXiv:2309.09512v1 [cond-mat.mes-hall])
Shuang Wu, Zaiyao Fei, Zeyuan Sun, Yangfan Yi, Wei Xia, Dayu Yan, Yanfeng Guo, Youguo Shi, Jiaqiang Yan, David H. Cobden, Wei-Tao Liu, Xiaodong Xu, Shiwei Wu

Topological properties in quantum materials are often governed by symmetry and tuned by crystal structure and external fields, and hence symmetry-sensitive nonlinear optical measurements in a magnetic field are a valuable probe. Here we report nonlinear magneto-optical second harmonic generation (SHG) studies of non-magnetic topological materials including bilayer WTe2, monolayer WSe2 and bulk TaAs. The polarization-resolved patterns of optical SHG under magnetic field show nonlinear Kerr rotation in these time-reversal symmetric materials. For materials with three-fold rotational symmetric lattice structure, the SHG polarization pattern rotates just slightly in a magnetic field, whereas in those with mirror or two-fold rotational symmetry the SHG polarization pattern rotates greatly and distorts. These different magneto-SHG characters can be understood by considering the superposition of the magnetic field-induced time-noninvariant nonlinear optical tensor and the crystal-structure-based time-invariant counterpart. The situation is further clarified by scrutinizing the Faraday rotation, whose subtle interplay with crystal symmetry accounts for the diverse behavior of the extrinsic nonlinear Kerr rotation in different materials. Our work illustrates the application of magneto-SHG techniques to directly probe nontrivial topological properties, and underlines the importance of minimizing extrinsic nonlinear Kerr rotation in polarization-resolved magneto-optical studies.


Altermagnetic Tunnel Junctions of RuO$_2$/TiO$_2$/CrO$_2$. (arXiv:2309.09561v1 [cond-mat.mtrl-sci])
Boyuan Chi, Leina Jiang, Yu Zhu, Guoqiang Yu, Caihua Wan, Jia Zhang, Xiufeng Han

Emerging altermagnetic materials with vanishing net magnetizations and unique band structures have been envisioned as an ideal electrode to design antiferromagnetic tunnel junctions. Their momentum-resolved spin splitting in band structures defines a spin-polarized Fermi surface, which allows altermagnetic materials to polarize current as a ferromagnet, when the current flows along specific directions relevant to their altermagnetism. Here, we design an Altermagnet/Insulator barrier/Ferromagnet junction, renamed as altermagnetic tunnel junction (ATMTJ), using RuO$_2$/TiO$_2$/CrO$_2$ as a prototype. Through first-principles calculations, we investigate the tunneling properties of the ATMTJ along the [001] and [110] directions, which shows that the tunneling magnetoresistance (TMR) is almost zero when the current flows along the [001] direction, while it can reach as high as 6100% with current flows along the [110] direction. The spin-resolved conduction channels of the altermagnetic RuO$_2$ electrode are found responsible for this momentum-dependent (or transport-direction-dependent) TMR effect. Furthermore, this ATMTJ can also be used to readout the N\'{e}el vector of the altermagnetic electrode RuO$_2$. Our work promotes the understanding toward the altermagnetic materials and provides an alternative way to design magnetic tunnel junctions with ultrahigh TMR ratios and robustness of the altermagnetic electrode against external disturbance, which broadens the application avenue for antiferromagnetic spintronics devices.


Consequences of the gauging of Weyl symmetry and the two-dimensional conformal anomaly. (arXiv:2309.09598v1 [hep-th])
Omar Zanusso

We discuss the generalization of the local renormalization group approach to theories in which Weyl symmetry is gauged. These theories naturally correspond to scale invariant -- rather than conformal invariant -- models in the flat space limit. We argue that this generalization can be of use when discussing the issue of scale vs conformal invariance in quantum and statistical field theories. The application of Wess-Zumino consistency conditions constrains the form of the Weyl anomaly and the beta functions in a nonperturbative way. In this work we concentrate on two dimensional models including also the contributions of the boundary. Our findings suggest that the renormalization group flow is irreversible in the sense of Zamolodchikov only if a new charge does not appear in the anomaly. It does not seem to be possible to find a general scheme for which the new charge is zero. Two illustrative examples involving flat space's conformal and scale invariant models that do not allow for a naive application of the standard local treatment are given.


Observation of an exceptional nexus in ultracold atoms. (arXiv:2309.09625v1 [quant-ph])
Chenhao Wang, Nan Li, Jin Xie, Cong Ding, Zhonghua Ji, Liantuan Xiao, Suotang Jia, Ying Hu, Yanting Zhao

In multistate non-Hermitian systems, higher-order exceptional points (EP) and exotic phenomena with no analogues in two-level systems arise, which have spawned intriguing prospects. A paradigm is an exceptional nexus (EX), a third-order EP as the cusp singularity of multiple exceptional arcs (EAs), that has a unique, hybrid topological nature. Using Bose-Einstein condensates to simulate the dynamics of a dissipative three-state system, we observe an EX formed by the coalescence of two EAs with different EP geometries. These exceptional structures are realized by controlling only two real parameters even in the absence of symmetry, and originate from the different roles of dissipation in the strong coupling limit and quantum Zeno regime, respectively. Our work paves the way for exploring higher-order EP physics in the many-body setting of ultracold atoms.


Strong Coupling of Two-Dimensional Excitons and Plasmonic Photonic Crystals: Microscopic Theory Reveals Triplet Spectra. (arXiv:2309.09673v1 [cond-mat.mes-hall])
Lara Greten, Robert Salzwedel, Tobias Göde, David Greten, Stephanie Reich, Stephen Hughes, Malte Selig, Andreas Knorr

Monolayers of transition metal dichalcogenides (TMDC) are direct-gap semiconductors with strong light-matter interactions featuring tightly bound excitons, while plasmonic crystals (PCs), consisting of metal nanoparticles that act as meta-atoms, exhibit collective plasmon modes and allow one to tailor electric fields on the nanoscale. Recent experiments show that TMDC-PC hybrids can reach the strong-coupling limit between excitons and plasmons forming new quasiparticles, so-called plexcitons. To describe this coupling theoretically, we develop a self-consistent Maxwell-Bloch theory for TMDC-PC hybrid structures, which allows us to compute the scattered light in the near- and far-field explicitly and provide guidance for experimental studies. Our calculations reveal a spectral splitting signature of strong coupling of more than $100\,$meV in gold-MoSe$_2$ structures with $30\,$nm nanoparticles, manifesting in a hybridization of exciton and plasmon into two effective plexcitonic bands. In addition to the hybridized states, we find a remaining excitonic mode with significantly smaller coupling to the plasmonic near-field, emitting directly into the far-field. Thus, hybrid spectra in the strong coupling regime can contain three emission peaks.


Modified Landauer's principle: How much can the Maxwell's demon gain by using general system-environment quantum state?. (arXiv:2309.09678v1 [quant-ph])
Sayan Mondal, Aparajita Bhattacharyya, Ahana Ghoshal, Ujjwal Sen

The Landauer principle states that decrease in entropy of a system, inevitably leads to a dissipation of heat to the environment. This statement is usually established by considering the system to be in contact with an environment that is initially in a thermal state with the system-environment initial state being in a product state. Here we show that a modified Landauer principle, with correction terms, still holds even if the system and environment are initially correlated and the environment is in an athermal state. Furthermore, we consider a case where the system is in contact with a large athermal environment, such that the system dynamics allow Born-Markov approximations, and we derive the finite-time modified Landauer's bound for the same.


Non-Hermitian physics and topological phenomena in convective thermal metamaterials. (arXiv:2309.09681v1 [physics.app-ph])
Zhoufei Liu

Non-Hermitian physics and topological phenomena are two hot topics attracted much attention in condensed matter physics and artificial metamaterials. Thermal metamaterials are one type of metamaterials that can manipulate heat on one's own. Recently, it has been found that non-Hermitian physics and topological phenomena can be implemented in purely diffusive systems. However, conduction alone is not omnipotent due to the missing of degrees of freedom. Heat convection, accompanying with conduction, is capable of realizing a large number of phases. In this review, we will present some important works on non-Hermitian and topological convective thermal metamaterials. In non-Hermitian physics, we will first discuss the implementation of exceptional point (EP) in thermal diffusion, followed by high-order EP and dynamic encirclement of EP. We then discuss two works on the extensions of EP in diffusion systems, namely, the chiral thermal behavior in the vicinity of EP and the Weyl exceptional ring. For topological phases, we will discuss two examples: a one-dimensional topological insulator and a two-dimensional quadrupole topological insulator. Finally, we will make a conclusion and present a promising outlook in this area. Convective thermal metamaterials offer an excellent platform for investigating non-Hermitian physics and topological phases. In addition, non-Hermitian and topological thermal metamaterials have great potential for industrial applications.


Integration of Quantum, Statistical, and Irreversible Thermodynamics in A Coherent Framework. (arXiv:2309.09823v1 [cond-mat.stat-mech])
Zi-Kui Liu

The combined law of thermodynamics derived by Gibbs laid the foundation of thermodynamics though only applicable to systems without internal processes. Gibbs further derived the classical statistical thermodynamics in terms of the probability of configurations in a system, which was extended to quantum mechanics-based statistical thermodynamics by Landau, while the irreversible thermodynamics was systemized by Onsager and expanded to chemical reactions by Prigogine. The development of density function theory (DFT) by Kohn enabled the quantitative prediction of properties of the ground-state configuration of a system from quantum mechanics. Here, we will present our theories that integrate quantum, statistical, and irreversible thermodynamics in a coherent framework by utilizing the predicative capability of DFT to revise the statistical thermodynamics (zentropy theory) and by keeping the entropy production due to irreversible processes in the combine law of thermodynamics to derive flux equations (theory of cross phenomena). The zentropy theory is shown capable of predicting the free energy landscape including singularity and instability at critical point and emergent positive or negative divergences of properties. The theory of cross phenomena can predict the coefficients of internal processes between conjugate variables (direct phenomena) and non-conjugate variables (cross phenomena) in the combined law of thermodynamics. Both are with inputs from DFT-based calculations only and without fitting parameters.


Direct topological insulator transitions in three dimensions are destabilized by non-perturbative effects of disorder. (arXiv:2309.09857v1 [cond-mat.dis-nn])
Yixing Fu, Justin H. Wilson, David A. Huse, J. H. Pixley

We reconsider the phase diagram of a three-dimensional $\mathbb{Z}_2$ topological insulator in the presence of short-ranged potential disorder with the insight that non-perturbative rare states destabilize the noninteracting Dirac semimetal critical point separating different topological phases. Based on our numerical data on the density of states, conductivity, and wavefunctions, we argue that the putative Dirac semimetal line is destabilized into a diffusive metal phase of finite extent due to non-perturbative effects of rare regions. We discuss the implications of these results for past and current experiments on doped topological insulators.


Topological edge and corner states in Bi fractals on InSb. (arXiv:2309.09860v1 [cond-mat.mes-hall])
R. Cañellas Núñez, Chen Liu, R. Arouca, L. Eek, Guanyong Wang, Yin Yin, Dandan Guan, Yaoyi Li, Shiyong Wang, Hao Zheng, Canhua Liu, Jinfeng Jia, C. Morais Smith

Topological materials hosting metallic edges characterized by integer quantized conductivity in an insulating bulk have revolutionized our understanding of transport in matter. The topological protection of these edge states is based on symmetries and dimensionality. However, only integer-dimensional models have been classified, and the interplay of topology and fractals, which may have a non-integer dimension, remained largely unexplored. Quantum fractals have recently been engineered in metamaterials, but up to present no topological states were unveiled in fractals realized in real materials. Here, we show theoretically and experimentally that topological edge and corner modes arise in fractals formed upon depositing thin layers of bismuth on an indium antimonide substrate. Scanning tunneling microscopy reveals the appearance of (nearly) zero-energy modes at the corners of Sierpi\'nski triangles, as well as the formation of outer and inner edge modes at higher energies. Unexpectedly, a robust and sharp depleted mode appears at the outer and inner edges of the samples at negative bias voltages. The experimental findings are corroborated by theoretical calculations in the framework of a continuum muffin-tin and a lattice tight-binding model. The stability of the topological features to the introduction of a Rashba spin-orbit coupling and disorder is discussed. This work opens the perspective to novel electronics in real materials at non-integer dimensions with robust and protected topological states.


Vacuum cleaving of superconducting niobium tips to optimize noise filtering and with adjustable gap size for scanning tunneling microscopy. (arXiv:2309.09903v1 [cond-mat.supr-con])
Carolina A. Marques, Aleš Cahlík, Berk Zengin, Tohru Kurosawa, Fabian D. Natterer

Superconducting (SC) tips for scanning tunneling microscopy (STM) can enhance a wide range of surface science studies because they offer exquisite energy resolution, allow the study of Josephson tunneling, or provide spatial contrast based on the local interaction of the SC tip with the sample. The appeal of a SC tip is also practical. An SC gap can be used to characterize and optimize the noise of a low-temperature apparatus. Unlike typical samples, SC tips can be made with less ordered materials, such as from SC polycrystalline wires or by coating a normal metal tip with a superconductor. Those recipes either require additional laboratory infrastructure or are carried out in ambient conditions, leaving an oxidized tip behind. Here, we revisit the vacuum cleaving of an Nb wire to prepare fully gapped tips in an accessible one-step procedure. To show their utility, we measure the SC gap of Nb on Au(111) to determine the base temperature of our microscope and to optimize its RF filtering. The deliberate coating of the Nb tip with Au fully suppresses the SC gap and we show how sputtering with Ar$^{+}$ ions can be used to gradually recover the gap, promising tunability for tailored SC gaps sizes.


Quantum optimization within lattice gauge theory model on a quantum simulator. (arXiv:2105.07134v4 [quant-ph] UPDATED)
Zheng Yan, Zheng Zhou, Yan-Hua Zhou, Yan-Cheng Wang, Xingze Qiu, Zi Yang Meng, Xue-Feng Zhang

Simulating lattice gauge theory (LGT) Hamiltonian and its nontrivial states by programmable quantum devices has attracted numerous attention in recent years. Rydberg atom arrays constitute one of the most rapidly developing arenas for quantum simulation and quantum computing. The $\mathbb{Z}_2$ LGT and topological order has been realized in experiments while the $U(1)$ LGT is being worked hard on the way. States of LGT have local constraint and are fragmented into several winding sectors with topological protection. It is therefore difficult to reach the ground state in target sector for experiments, and it is also an important task for quantum topological memory. Here, we propose a protocol of sweeping quantum annealing (SQA) for searching the ground state among topological sectors. With the quantum Monte Carlo method, we show that this SQA has linear time complexity of size with applications to the antiferromagnetic transverse field Ising model, which has emergent $U(1)$ gauge fields. This SQA protocol can be realized easily on quantum simulation platforms such as Rydberg array and D-wave annealer. We expect this approach would provide an efficient recipe for resolving the topological hindrances in quantum optimization and the preparation of quantum topological state.


Topology, criticality, and dynamically generated qubits in a stochastic measurement-only Kitaev model. (arXiv:2207.07096v2 [quant-ph] UPDATED)
Adithya Sriram, Tibor Rakovszky, Vedika Khemani, Matteo Ippoliti

We consider a paradigmatic solvable model of topological order in two dimensions, Kitaev's honeycomb Hamiltonian, and turn it into a measurement-only dynamics consisting of stochastic measurements of two-qubit bond operators. We find an entanglement phase diagram that resembles that of the Hamiltonian problem in some ways, while being qualitatively different in others. When one type of bond is dominantly measured, we find area-law entangled phases that protect two topological qubits (on a torus) for a time exponential in system size. This generalizes the recently-proposed idea of Floquet codes, where logical qubits are dynamically generated by a time-periodic measurement schedule, to a stochastic setting. When all types of bonds are measured with comparable frequency, we find a critical phase with a logarithmic violation of the area-law, which sharply distinguishes it from its Hamiltonian counterpart. The critical phase has the same set of topological qubits, as diagnosed by the tripartite mutual information, but protects them only for a time polynomial in system size. Furthermore, we observe an unusual behavior for the dynamical purification of mixed states, characterized at late times by the dynamical exponent $z = 1/2$ -- a super-ballistic dynamics made possible by measurements.


Non-reciprocal forces and exceptional phase transitions in metric and topological flocks. (arXiv:2208.09461v2 [cond-mat.soft] UPDATED)
Charles Packard, Daniel M. Sussman

Many models of flocking involve alignment rules based on the mean orientation of neighboring particles, which we show introduces microscopic non-reciprocal interactions. In the absence of this microscopic non-reciprocity an exceptional phase transition is predicted at low noise strength within the Toner-Tu framework of polar aligning matter; we demonstrate this transition via large-scale numerical simulations. By coarse-graining the microscopic non-reciprocal forces found in more common models of flocking, we identify additional terms in a hydrodynamic description which lead to a highly ordered clustered phase in metric models and restore the homogeneous flocking phase in topological models.


Shortest Route to Non-Abelian Topological Order on a Quantum Processor. (arXiv:2209.03964v2 [quant-ph] UPDATED)
Nathanan Tantivasadakarn, Ruben Verresen, Ashvin Vishwanath

A highly coveted goal is to realize emergent non-Abelian gauge theories and their anyonic excitations, which encode decoherence-free quantum information. While measurements in quantum devices provide new hope for scalably preparing such long-range entangled states, existing protocols using the experimentally established ingredients of a finite-depth circuit and a single round of measurement produce only Abelian states. Surprisingly, we show there exists a broad family of non-Abelian states -- namely those with a Lagrangian subgroup -- which can be created using these same minimal ingredients, bypassing the need for new resources such as feed-forward. To illustrate that this provides realistic protocols, we show how $D_4$ non-Abelian topological order can be realized, e.g., on Google's quantum processors using a depth-11 circuit and a single layer of measurements. Our work opens the way towards the realization and manipulation of non-Abelian topological orders, and highlights counter-intuitive features of the complexity of non-Abelian phases.


Deep learning extraction of band structure parameters from density of states: a case study on trilayer graphene. (arXiv:2210.06310v2 [cond-mat.mes-hall] UPDATED)
Paul Henderson, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, Maksym Serbyn

The development of two-dimensional materials has resulted in a diverse range of novel, high-quality compounds with increasing complexity. A key requirement for a comprehensive quantitative theory is the accurate determination of these materials' band structure parameters. However, this task is challenging due to the intricate band structures and the indirect nature of experimental probes. In this work, we introduce a general framework to derive band structure parameters from experimental data using deep neural networks. We applied our method to the penetration field capacitance measurement of trilayer graphene, an effective probe of its density of states. First, we demonstrate that a trained deep network gives accurate predictions for the penetration field capacitance as a function of tight-binding parameters. Next, we use the fast and accurate predictions from the trained network to automatically determine tight-binding parameters directly from experimental data, with extracted parameters being in a good agreement with values in the literature. We conclude by discussing potential applications of our method to other materials and experimental techniques beyond penetration field capacitance.


Current Noise of Hydrodynamic Electrons. (arXiv:2211.01366v3 [cond-mat.mes-hall] UPDATED)
Aaron Hui, Brian Skinner

A resistor at finite temperature produces white noise fluctuations of the current called Johnson-Nyquist noise. Measuring the amplitude of this noise provides a powerful primary thermometry technique to access the electron temperature. In practical situations, however, one needs to generalize the Johnson-Nyquist theorem to handle spatially inhomogeneous temperature profiles. Recent work provided such a generalization for ohmic devices obeying the Wiedemann-Franz law, but there is a need to provide a similar generalization for hydrodynamic electron systems, since hydrodynamic electrons provide unusual sensitivity for Johnson noise thermometry but they do not admit a local conductivity nor obey the Wiedemann-Franz law. Here we address this need by considering low-frequency Johnson noise in the hydrodynamic setting for a rectangular geometry. Unlike in the ohmic setting, we find that the Johnson noise is geometry-dependent due to non-local viscous gradients. Nonetheless, ignoring the geometric correction only leads to an error of at most 40% as compared to naively using the ohmic result.


Phase diagrams of spin-$S$ Kitaev ladders. (arXiv:2211.02754v3 [cond-mat.str-el] UPDATED)
Yushao Chen, Yin-Chen He, Aaron Szasz

We investigate the ground states of spin-$S$ Kitaev ladders using exact analytical solutions (for $S = 1/2$), perturbation theory, and the density matrix renormalization group (DMRG) method. We find an even-odd effect: in the case of half-integer $S$, we find phases with spontaneous symmetry breaking (SSB) and symmetry-protected topological (SPT) order; for integer $S$, we find SSB and trivial paramagnetic phases. We also study the transitions between the various phases; notably, for half-integer $S$ we find a transition between two distinct SPT orders, and for integer $S$ we find unnecessary first order phase transitions within a trivial phase


Efficient and quantum-adaptive machine learning with fermion neural networks. (arXiv:2211.05793v3 [quant-ph] UPDATED)
Pei-Lin Zheng, Jia-Bao Wang, Yi Zhang

Classical artificial neural networks have witnessed widespread successes in machine-learning applications. Here, we propose fermion neural networks (FNNs) whose physical properties, such as local density of states or conditional conductance, serve as outputs, once the inputs are incorporated as an initial layer. Comparable to back-propagation, we establish an efficient optimization, which entitles FNNs to competitive performance on challenging machine-learning benchmarks. FNNs also directly apply to quantum systems, including hard ones with interactions, and offer in-situ analysis without preprocessing or presumption. Following machine learning, FNNs precisely determine topological phases and emergent charge orders. Their quantum nature also brings various advantages: quantum correlation entitles more general network connectivity and insight into the vanishing gradient problem, quantum entanglement opens up novel avenues for interpretable machine learning, etc.


Kondo Phase in Twisted Bilayer Graphene -- A Unified Theory for Distinct Experiments. (arXiv:2301.04661v3 [cond-mat.str-el] UPDATED)
Geng-Dong Zhou, Yi-Jie Wang, Ninghua Tong, Zhi-Da Song

A number of interesting physical phenomena have been discovered in magic-angle twisted bilayer graphene (MATBG), such as superconductivity, correlated gapped and gapless phases, etc. The gapped phases are believed to be symmetry-breaking states described by mean-field theories, whereas gapless phases exhibit features beyond mean field. This work, combining poor man's scaling, numerical renormalization group, and dynamic mean-field theory, demonstrates that the gapless phases are the heavy Fermi liquid state with some symmetries broken and the others preserved. We adopt the recently proposed topological heavy fermion model for MATBG with effective local orbitals around AA-stacking regions and Dirac fermions surrounding them. At zero temperature and most non-integer fillings, the ground states are found to be heavy Fermi liquids and exhibit Kondo resonance peaks. The Kondo temperature $T_K$ is found at the order of 1meV. A higher temperature than $T_K$ will drive the system into a metallic LM phase where disordered LM's and a Fermi liquid coexist. At integer fillings $\pm1,\pm2$, $T_K$ is suppressed to zero or a value weaker than RKKY interaction, leading to Mott insulators or symmetry-breaking states. This theory offers a unified explanation for several experimental observations, such as zero-energy peaks and quantum-dot-like behaviors in STM, the Pomeranchuk effect, and the saw-tooth feature of inverse compressibility, etc. For future experimental verification, we predict that the Fermi surface in the gapless phase will shrink upon heating - as a characteristic of the heavy Fermi liquid. We also conjecture that the heavy Fermi liquid is the parent state of the observed unconventional superconductivity because the Kondo screening reduces the overwhelming Coulomb interaction (~60meV) to a rather small effective interaction (~1meV) comparable to possible weak attractive interactions.


Non-Hermitian boost deformation. (arXiv:2301.05973v2 [cond-mat.str-el] UPDATED)
Taozhi Guo, Kohei Kawabata, Ryota Nakai, Shinsei Ryu

The Hatano-Nelson model is one of the most prototypical non-Hermitian models that exhibit the intrinsic non-Hermitian topological phases and the concomitant skin effect. These phenomena unique to non-Hermitian topological systems originate from the Galilean transformation. Here, we extend such an idea to a broader range of systems based on an imaginary boost deformation and identify the corresponding energy-twisted boundary conditions. This imaginary boost deformation complexifies spectral parameters of integrable models and can be implemented by the coordinate Bethe ansatz. We apply the imaginary boost deformation to several typical integrable models, including free fermions, the Calogero-Sutherland model, and the XXZ model. We find the complex-spectral winding in free fermion models under the periodic boundary conditions and the non-Hermitian skin effect under the open boundary conditions. The interaction effect is also shown in the two-particle spectrum of the XXZ model.


Coherent Charge Oscillations in a Bilayer Graphene Double Quantum Dot. (arXiv:2303.10119v2 [cond-mat.mes-hall] UPDATED)
Katrin Hecker, Luca Banszerus, Aaron Schäpers, Samuel Möller, Anton Peters, Eike Icking, Kenji Watanabe, Takashi Taniguchi, Christian Volk, Christoph Stampfer

The coherent dynamics of a quantum mechanical two-level system passing through an anti-crossing of two energy levels can give rise to Landau-Zener-St\"uckelberg-Majorana (LZSM) interference. LZSM interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decoherence in semiconductor quantum dots (QDs). Recently, bilayer graphene has developed as a promising platform to host highly tunable QDs potentially useful for hosting spin and valley qubits. So far, in this system no coherent oscillations have been observed and little is known about charge noise in this material. Here, we report coherent charge oscillations and $T_2^*$ charge decoherence times in a bilayer graphene double QD. The charge decoherence times are measured independently using LZSM interference and photon assisted tunneling. Both techniques yield $T_2^*$ average values in the range of 400 to 500~ps. The observation of charge coherence allows to study the origin and spectral distribution of charge noise in future experiments.


Orientational dynamics and rheology of active suspensions in weakly viscoelastic flows. (arXiv:2303.15241v3 [cond-mat.soft] UPDATED)
Akash Choudhary, Sankalp Nambiar, Holger Stark

Microswimmer suspensions in Newtonian fluids exhibit unusual macroscale properties, such as a superfluidic behavior, which can be harnessed to perform work at microscopic scales. Since most biological fluids are non-Newtonian, here we study the rheology of a microswimmer suspension in a weakly viscoelastic shear flow. At the individual level, we find that the viscoelastic stresses generated by activity substantially modify the Jeffery orbits well-known from Newtonian fluids. The orientational dynamics depends on the swimmer type; especially pushers can resist flow-induced rotation and align at an angle with the flow. To analyze its impact on bulk rheology, we study a dilute microswimmer suspension in the presence of random tumbling and rotational diffusion. Strikingly, swimmer activity and its elastic response in polymeric fluids alter the orientational distribution and substantially amplify the swimmer-induced viscosity. This suggests that pusher suspensions reach the superfluidic regime at lower volume fractions compared to a Newtonian fluid with identical viscosity.


Floquet-engineered nonlinearities and controllable pair-hopping processes: From optical Kerr cavities to correlated quantum matter. (arXiv:2304.05865v2 [cond-mat.quant-gas] UPDATED)
Nathan Goldman, Oriana K. Diessel, Luca Barbiero, Maximilian Prüfer, Marco Di Liberto, Lucila Peralta Gavensky

This work explores the possibility of creating and controlling unconventional nonlinearities by periodic driving, in a broad class of systems described by the nonlinear Schr\"odinger equation (NLSE). By means of a parent quantum many-body description, we demonstrate that such driven systems are well captured by an effective NLSE with emergent nonlinearities, which can be finely controlled by tuning the driving sequence. We first consider a general class of two-mode nonlinear systems - relevant to optical Kerr cavities, waveguides and Bose-Einstein condensates - where we find an emergent four-wave mixing nonlinearity, which originates from pair-hopping processes in the parent quantum picture. Tuning this drive-induced nonlinearity is shown to modify the phase-space topology, which can be detected through relative population and phase measurements. We then couple individual (two-mode) dimers in view of designing extended lattice models with unconventional nonlinearities and controllable pair-hopping processes. Following this general dimerization construction, we obtain an effective lattice model with drive-induced interactions, whose ground-state exhibits orbital order, chiral currents and emergent magnetic fluxes through the spontaneous breaking of time-reversal symmetry. We analyze these intriguing properties both in the weakly-interacting (mean-field) regime, captured by the effective NLSE, and in the strongly-correlated quantum regime. Our general approach opens a route for the engineering of unconventional optical nonlinearities in photonic devices and controllable drive-induced interactions in ultracold quantum matter.


Symmetry-protected topological phases, conformal criticalities, and duality in exactly solvable SO($n$) spin chains. (arXiv:2305.03398v2 [cond-mat.str-el] UPDATED)
Sreejith Chulliparambil, Hua-Chen Zhang, Hong-Hao Tu

We introduce a family of SO($n$)-symmetric spin chains which generalize the transverse-field Ising chain for $n=1$. These spin chains are defined with Gamma matrices and can be exactly solved by mapping to $n$ species of itinerant Majorana fermions coupled to a static $\mathbb{Z}_2$ gauge field. Their phase diagrams include a critical point described by the $\mathrm{Spin}(n)_{1}$ conformal field theory as well as two distinct gapped phases. We show that one of the gapped phases is a trivial phase and the other realizes a symmetry-protected topological phase when $n \geq 2$. These two gapped phases are proved to be related to each other by a Kramers-Wannier duality. Furthermore, other elegant structures in the transverse-field Ising chain, such as the infinite-dimensional Onsager algebra, also carry over to our models.


Control of wave scattering for robust coherent transmission in a disordered medium. (arXiv:2305.07831v2 [physics.optics] UPDATED)
Zhun-Yong Ong

The spatial structure of the inhomogeneity in a disordered medium determines how waves scatter and propagate in it. We present a theoretical model of how the Fourier components of the disorder control wave scattering in a two-dimensional disordered medium, by analyzing the disordered Green's function for scalar waves. By selecting a set of Fourier components with the appropriate wave vectors, we can enhance or suppress wave scattering to filter out unwanted waves and allow the robust coherent transmission of waves at specific angles and wavelengths through the disordered medium. Based on this principle, we propose an approach for creating selective transparency, band gaps and anisotropy in disordered media. This approach is validated by direct numerical simulations of coherent wave transmission over a wide range of incident angles and frequencies and can be experimentally realized in disordered photonic crystals. Our approach, which requires neither nontrivial topological wave properties nor a non-Hermitian medium, creates new opportunities for exploring a broad range of wave phenomena in disordered systems.


RG boundaries and Cardy's variational ansatz for multiple perturbations. (arXiv:2306.13719v2 [hep-th] UPDATED)
Anatoly Konechny

We consider perturbations of 2D CFTs by multiple relevant operators. The massive phases of such perturbations can be labeled by conformal boundary conditions. Cardy's variational ansatz approximates the vacuum state of the perturbed theory by a smeared conformal boundary state. In this paper we study the limitations and propose generalisations of this ansatz using both analytic and numerical insights based on TCSA. In particular we analyse the stability of Cardy's ansatz states with respect to boundary relevant perturbations using bulk-boundary OPE coefficients. We show that certain transitions between the massive phases arise from a pair of boundary RG flows. The RG flows start from the conformal boundary on the transition surface and end on those that lie on the two sides of it. As an example we work out the details of the phase diagram for the Ising field theory and for the tricritical Ising model perturbed by the leading thermal and magnetic fields. For the latter we find a pair of novel transition lines that correspond to pairs of RG flows. Although the mass gap remains finite at the transition lines, several one-point functions change their behaviour. We discuss how these lines fit into the standard phase diagram of the tricritical Ising model. We show that each line extends to a two-dimensional surface $\xi_{\sigma,c}$ in a three coupling space when we add perturbations by the subleading magnetic field. Close to this surface we locate symmetry breaking critical lines leading to the critical Ising model. Near the critical lines we find first order phase transition lines describing two-phase coexistence regions as predicted in Landau theory. The surface $\xi_{\sigma,c}$ is determined from the CFT data using Cardy's ansatz and its properties are checked using TCSA numerics.


Dynamics of electronic states in the Intermediate phase of 1T-TaS$_2$. (arXiv:2307.06444v2 [cond-mat.str-el] UPDATED)
Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, Luca Perfetti

This article reports a comparative study of bulk and surface properties in the transition metal dichalcogenide 1T-TaS$_2$. When heating the sample, the surface displays an intermediate insulating phase that persists for $\sim 10$ K on top of a metallic bulk. The weaker screening of Coulomb repulsion and stiffer Charge Density Wave (CDW) explain such resilience of a correlated insulator in the topmost layers. Both time resolved ARPES and transient reflectivity are employed to investigate the dynamics of electrons and CDW collective motion. It follows that the amplitude mode is always stiffer at the surface and displays variable coupling to the Mott-Peierls band, stronger in the low temperature phase and weaker in the intermediate one.


Size-Induced High Electrocaloric Response of Dense Ferroelectric Nanocomposites. (arXiv:2309.03187v2 [physics.app-ph] UPDATED)
Anna N. Morozovska, Oleksandr S. Pylypchuk, Serhii Ivanchenko, Eugene A. Eliseev, Hanna V. Shevliakova, Lubomir Korolevich, Lesya P. Yurchenko, Oleksandr V. Shyrokov, Nicholas V. Morozovsky, Vladimir N. Poroshin, Zdravko Kutnjak, Victor V. Vainberg

Analytical results obtained within Landau-Ginzburg-Devonshire approach and effective media models, predict that the synergy of size effects and Vegard stresses can significantly enhance the electrocaloric cooling (up to 7 times) of the BaTiO3 nanoparticles in comparison with a bulk BaTiO3. To compare with the considered effective media models, we measured the capacitance-voltage and current-voltage characteristics of the dense nanocomposites consisting of (28-35) vol.% BaTiO3 nanoparticles incorporated in organic polymers and determined experimentally the effective dielectric permittivity and losses of the composites. Generalizing obtained analytical results, various ferroelectric nanoparticles spontaneously stressed by elastic defects, such as oxygen vacancies or any other elastic dipoles, which create a strong chemical pressure, can cause the giant electrocaloric response of dense ferroelectric nanocomposites. We have shown that the advantages of the studied lead-free dense nanocomposites are the good tunability of electrocaloric cooling temperature due to the size effects in ferroelectric nanoparticles and the easy control of the high electrocaloric cooling by electric fields. This makes the dense ferroelectric nanocomposites promising for cooling of conventional and innovative electronic elements, such as FETs with high-temperature superconductor channels.


Floquet analysis of a driven Kitaev chain in presence of a quasiperiodic potential. (arXiv:2309.03836v2 [cond-mat.mes-hall] UPDATED)
Koustav Roy, Shilpi Roy, Saurabh Basu

The interplay of topology and disorder in non-equilibrium quantum systems is an intriguing subject. Here, we look for a suitable platform that enables an in-depth exploration of the topic. To this end, we analyze the topological and localization properties of a dimerized one-dimensional Kitaev chain in the presence of an onsite quasiperiodic potential whose amplitude is modulated periodically in time. The topological features have been explored via computing the real-space winding numbers corresponding to both the Majorana zero and the $\pi$ energy modes. We enumerate the scenario at different driving frequencies. In particular, at either low or intermediate frequency regimes, the phase diagram concerning the zero mode involves two distinct phase transitions, one from a topologically trivial to a non-trivial phase, and another from a topological phase to an Anderson localized phase. On the other hand, the study of the $\pi$ modes reveals the emergence of a unique topological phase, where both the bulk and the edge modes are fully localized, which may be called as the Floquet topological Anderson phase. Moreover, while the low and high-frequency regimes host extended and localized states, respectively, at intermediate frequencies, the states can be extended, critical (or multifractal), and localized. Inverse and normalized participation ratios are used as tools to characterize the extended and the localized states. Further, the intermediate frequency regime is thoroughly enumerated via a finite-size scaling analysis of the fractal dimension.


High-throughput screening of coherent topologically close-packed precipitates in hexagonal close-packed metallic systems. (arXiv:2309.04822v2 [cond-mat.mtrl-sci] UPDATED)
Junyuan Bai, Xueyong Pang, Gaowu Qin

The nanoscale, coherent topologically close-packed (TCP) precipitate plates in magnesium alloys are found beneficial to the strength and creep resistance of alloys. However, the conventional trial-and-error method is too time-consuming and costly, which impedes the application of TCP precipitates to hcp-based metallic alloys. Here, we systematically screen the potential coherent TCP precipitate plates in the three most common hcp alloys, magnesium (Mg), titanium (Ti), and zirconium (Zr) alloys, using an efficient high-throughput screening methodology. Our findings indicate that the hcp-to-TCP structural transformations readily occur in Mg alloys, leading to abundant precipitation of TCP plates. However, hcp-Ti and Zr alloys exhibit a preference for hcp-to-bcc structural transformations, rather than the in situ precipitation of TCP plates. These screening results are largely consistent with experimental observations. The insights gained contribute to a deeper understanding of precipitation behavior in various hcp-based alloys at the atomic level and provide insightful reference results for designing novel alloys containing TCP phases.


Klein-bottle quadrupole insulators and Dirac semimetals. (arXiv:2309.07784v2 [cond-mat.mes-hall] UPDATED)
Chang-An Li, Junsong Sun, Song-Bo Zhang, Huaiming Guo, Björn Trauzettel

The Benalcazar-Bernevig-Hughes (BBH) quadrupole insulator model is a cornerstone model for higher-order topological phases. It requires \pi flux threading through each plaquette of the two-dimensional Su-Schrieffer-Heeger model. Recent studies show that particular \pi-flux patterns can modify the fundamental Brillouin zone from the shape of a torus to a Klein-bottle with emerging topological phases. By designing different \pi-flux patterns, we propose two types of Klein-bottle BBH models. These models show rich topological phases including Klein-bottle quadrupole insulators and Dirac semimetals. The phase with nontrivial Klein-bottle topology shows twined edge modes at open boundaries. These edge modes can further support second-order topology yielding a quadrupole insulator. Remarkably, both models are robust against flux perturbations. Moreover, we show that different \pi-flux patterns dramatically affect the phase diagram of the Klein-bottle BBH models. Going beyond the original BBH model, Dirac semimetal phases emerge in Klein-bottle BBH models featured by the coexistence of twined edge modes and bulk Dirac points.


Found 20 papers in prb
Date of feed: Tue, 19 Sep 2023 03:17:27 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Spin Nernst effect and spatiotemporal dynamic simulation of topological magnons in the antiferromagnet ${\mathrm{Cu}}_{3}{\mathrm{TeO}}_{6}$
Yizhi Liu, Chen Fang, Shaoqin Jiang, Yuan Li, and Limei Xu
Author(s): Yizhi Liu, Chen Fang, Shaoqin Jiang, Yuan Li, and Limei Xu

The topological surface state arising from the nontrivial topology of the bulk band structure has attracted a wide range of interest. Compared with electrons, the magnon propagation in magnetic materials can be more intuitively reflected in the spin precession and generate different effects. Using m…


[Phys. Rev. B 108, 094427] Published Mon Sep 18, 2023

Wannier-Stark localization in one-dimensional amplitude-chirped lattices
Qi-Bo Zeng, Bo Hou, and Han Xiao
Author(s): Qi-Bo Zeng, Bo Hou, and Han Xiao

We study the Wannier-Stark (WS) localization in one-dimensional amplitude-chirped lattices with the $j\mathrm{th}$ on-site potential modulated by a function $Fjcos(2παj)$, where $F$ is the external field with a period determined by $α=p/q$ ($p$ and $q$ are coprime integers). In the Hermitian (or non…


[Phys. Rev. B 108, 104207] Published Mon Sep 18, 2023

Majorana fermions on the domain wall of marginally twisted bilayer of transition metal dichalcogenides
Richang Huang, Dapeng Yu, and Wang Yao
Author(s): Richang Huang, Dapeng Yu, and Wang Yao

We propose to realize two-dimensional superstructures of chiral topological superconductors based on marginally twisted bilayers of transition metal dichalcogenides in proximity to a conventional $s$-wave superconductor. Majorana fermions arise at the domain boundaries of the $AB$ and ${A}^{′}{B}^{…


[Phys. Rev. B 108, 115307] Published Mon Sep 18, 2023

Solitons induced by an in-plane magnetic field in rhombohedral multilayer graphene
Max Tymczyszyn, Peter H. Cross, and Edward McCann
Author(s): Max Tymczyszyn, Peter H. Cross, and Edward McCann

We model the influence of an in-plane magnetic field on the orbital motion of electrons in rhombohedral graphene multilayers. For zero field, the low-energy band structure includes a pair of flat bands near zero energy, which are localized on the surface layers of a finite thin film. For finite fiel…


[Phys. Rev. B 108, 115425] Published Mon Sep 18, 2023

Observation of hybrid-order topological pump in a Kekulé-textured graphene lattice
Tianzhi Xia, Yuzeng Li, Qicheng Zhang, Xiying Fan, Meng Xiao, and Chunyin Qiu
Author(s): Tianzhi Xia, Yuzeng Li, Qicheng Zhang, Xiying Fan, Meng Xiao, and Chunyin Qiu

The Thouless charge pumping protocol provides an effective route for realizing topological particle transport. To date, the first-order and higher-order topological pumps, exhibiting transitions of edge-bulk-edge and corner-bulk-corner states, respectively, are observed in a variety of experimental …


[Phys. Rev. B 108, 125125] Published Mon Sep 18, 2023

Electronic and spin-orbit properties of $h$-BN encapsulated bilayer graphene
Klaus Zollner, Eike Icking, and Jaroslav Fabian
Author(s): Klaus Zollner, Eike Icking, and Jaroslav Fabian

Van der Waals heterostructures consisting of Bernal bilayer graphene (BLG) and hexagonal boron nitride (hBN) are investigated. By performing first-principles calculations, we capture the essential BLG band structure features for several stacking and encapsulation scenarios. A low-energy model Hamilt…


[Phys. Rev. B 108, 125126] Published Mon Sep 18, 2023

Topological surface states hybridized with bulk states of Bi-doped ${\mathrm{PbSb}}_{2}{\mathrm{Te}}_{4}$ revealed in quasiparticle interference
Yuya Hattori, Keisuke Sagisaka, Shunsuke Yoshizawa, Yuki Tokumoto, and Keiichi Edagawa
Author(s): Yuya Hattori, Keisuke Sagisaka, Shunsuke Yoshizawa, Yuki Tokumoto, and Keiichi Edagawa

Topological surface states of Bi-doped ${\mathrm{PbSb}}_{2}{\mathrm{Te}}_{4} [\mathrm{Pb}{({\mathrm{Bi}}_{0.20}{\mathrm{Sb}}_{0.80})}_{2}{\mathrm{Te}}_{4}]$ are investigated through analyses of quasiparticle interference (QPI) patterns observed by scanning tunneling microscopy. Interpretation of the…


[Phys. Rev. B 108, L121408] Published Mon Sep 18, 2023

Spatially anisotropic $S=1$ square-lattice antiferromagnet with single-ion anisotropy realized in a Ni(II) pyrazine-$n,{n}^{′}$-dioxide coordination polymer
Jamie L. Manson, Daniel M. Pajerowski, Jeffrey M. Donovan, Brendan Twamley, Paul A. Goddard, Roger Johnson, Jesper Bendix, John Singleton, Tom Lancaster, Stephen J. Blundell, Jacek Herbrych, Peter J. Baker, Andrew J. Steele, Francis L. Pratt, Isabel Franke-Chaudet, Ross D. McDonald, Alex Plonczak, and Pascal Manuel
Author(s): Jamie L. Manson, Daniel M. Pajerowski, Jeffrey M. Donovan, Brendan Twamley, Paul A. Goddard, Roger Johnson, Jesper Bendix, John Singleton, Tom Lancaster, Stephen J. Blundell, Jacek Herbrych, Peter J. Baker, Andrew J. Steele, Francis L. Pratt, Isabel Franke-Chaudet, Ross D. McDonald, Alex Plonczak, and Pascal Manuel

The $\mathrm{Ni}{(\mathrm{NCS})}_{2}{(\mathrm{pyzdo})}_{2}$ coordination polymer is found to be an $S=1$ spatially anisotropic square lattice with easy-axis single-ion anisotropy. This conclusion is based upon considering in concert the experimental probes x-ray diffraction, magnetic susceptibility,…


[Phys. Rev. B 108, 094425] Published Thu Sep 14, 2023

Anharmonicity and structural phase transition in the Mott insulator ${\mathrm{Cu}}_{2}{\mathrm{P}}_{2}{\mathrm{O}}_{7}$
Svitlana Pastukh, Paweł T. Jochym, Oleksandr Pastukh, Jan Łażewski, Dominik Legut, and Przemysław Piekarz
Author(s): Svitlana Pastukh, Paweł T. Jochym, Oleksandr Pastukh, Jan Łażewski, Dominik Legut, and Przemysław Piekarz

Ab initio investigations of the structural, electronic, and dynamical properties of the high-temperature $β$ phase of copper pyrophosphate were performed using density functional theory. The electronic band structure shows the Mott insulating state due to electron correlations in the copper ions. By…


[Phys. Rev. B 108, 104104] Published Thu Sep 14, 2023

Band structure, $g$-factor, and spin relaxation in $n$-type InAsP alloys
Sunil K. Thapa, Rathsara R. H. H. Mudiyanselage, Thalya Paleologu, Sukgeun Choi, Zhuo Yang, Y. Kohama, Y. H. Matsuda, Joseph Spencer, Brenden A. Magill, Chris J. Palmstrøm, Christopher J. Stanton, and Giti A. Khodaparast
Author(s): Sunil K. Thapa, Rathsara R. H. H. Mudiyanselage, Thalya Paleologu, Sukgeun Choi, Zhuo Yang, Y. Kohama, Y. H. Matsuda, Joseph Spencer, Brenden A. Magill, Chris J. Palmstrøm, Christopher J. Stanton, and Giti A. Khodaparast

We present experimental and theoretical studies of the magneto-optical properties of $n$-type ${\mathrm{InAs}}_{x}{\mathrm{P}}_{1−x}$ films in ultrahigh magnetic fields at room temperature. We compare Landau level and band structure calculations with observed cyclotron resonance (CR) measurements an…


[Phys. Rev. B 108, 115202] Published Thu Sep 14, 2023

Temperature evolution of domains and intradomain chirality in $1T−{\mathrm{TaS}}_{2}$
Boning Yu, Ghilles Ainouche, Manoj Singh, Bishnu Sharma, James Huber, and Michael C. Boyer
Author(s): Boning Yu, Ghilles Ainouche, Manoj Singh, Bishnu Sharma, James Huber, and Michael C. Boyer

We use scanning tunneling microscopy to study the temperature evolution of the atomic-scale properties of the nearly commensurate charge density wave (NC-CDW) state of the low-dimensional material $1T\text{−}{\mathrm{TaS}}_{2}$. Our measurements at 203, 300, and 354 K, roughly spanning the temperatu…


[Phys. Rev. B 108, 115421] Published Thu Sep 14, 2023

Experimental verification of band convergence in Sr and Na codoped PbTe
Yuya Hattori, Shunsuke Yoshizawa, Keisuke Sagisaka, Yuki Tokumoto, Keiichi Edagawa, Takako Konoike, Shinya Uji, and Taichi Terashima
Author(s): Yuya Hattori, Shunsuke Yoshizawa, Keisuke Sagisaka, Yuki Tokumoto, Keiichi Edagawa, Takako Konoike, Shinya Uji, and Taichi Terashima

Scanning tunneling microscopy (STM) and transport measurements have been performed to investigate the electronic structure and its temperature dependence in heavily Sr and Na codoped PbTe, which is recognized as one of the most promising thermoelectric (TE) materials. Our main findings are as follow…


[Phys. Rev. B 108, 125119] Published Thu Sep 14, 2023

Electronic excitations in $5{d}^{4}\phantom{\rule{4pt}{0ex}}J=0\phantom{\rule{4pt}{0ex}}{\mathrm{Os}}^{4+}$ halides studied by resonant inelastic x-ray scattering and optical spectroscopy
P. Warzanowski, M. Magnaterra, P. Stein, G. Schlicht, Q. Faure, Ch. J. Sahle, T. Lorenz, P. Becker, L. Bohatý, M. Moretti Sala, G. Monaco, P. H. M. van Loosdrecht, and M. Grüninger
Author(s): P. Warzanowski, M. Magnaterra, P. Stein, G. Schlicht, Q. Faure, Ch. J. Sahle, T. Lorenz, P. Becker, L. Bohatý, M. Moretti Sala, G. Monaco, P. H. M. van Loosdrecht, and M. Grüninger

The cubic halides K2OsCl6, K2OsBr6, and Rb2OsBr6 are found to be excellent realizations of spin-orbit-entangled nonmagnetic J=0 compounds in the intermediate coupling regime. The two complementary techniques of resonant inelastic x-ray scattering and optical spectroscopy allow the authors to draw a comprehensive picture of the electronic excitations and to assess the electronic structure. The accurate set of electronic parameters such as spin-orbit coupling, Hund’s coupling, crystal-field splitting, Mott gap, and charge-transfer energy will serve as a solid reference for future studies on Os compounds.


[Phys. Rev. B 108, 125120] Published Thu Sep 14, 2023

Phonon-mediated dark to bright plasmon conversion
Benjamin Rousseaux, Yanko Todorov, Angela Vasanelli, and Carlo Sirtori
Author(s): Benjamin Rousseaux, Yanko Todorov, Angela Vasanelli, and Carlo Sirtori

Unlocking the full potential of nanophotonic devices involves the engineering of their intrinsic optical properties. Here, the authors investigate a quantum theory that treats the interaction between quantum-confined plasmons and optical phonons in semiconductors. This theory allows computation of the optical response beyond the conventional Drude-Lorentz model. In particular, it predicts new effects, such as an oscillator-strength transfer mechanism between phonons and dark plasmon modes.


[Phys. Rev. B 108, 125417] Published Thu Sep 14, 2023

Scattering quantum walk framework for two-dimensional materials: The case of honeycomb lattice structures
B. F. Venancio, H. S. Ghizoni, and M. G. E. da Luz
Author(s): B. F. Venancio, H. S. Ghizoni, and M. G. E. da Luz

Bidimensional crystals display unique properties of both fundamental and applied interest, with a good part of these properties being related to the topological aspects of 2D materials. Discrete quantum walks models, commonly used in the area of quantum information, are mathematical constructions in…


[Phys. Rev. B 108, 094303] Published Wed Sep 13, 2023

Vanadium-based superconductivity in the breathing kagome compound ${\mathrm{Ta}}_{2}{\mathrm{V}}_{3.1}{\mathrm{Si}}_{0.9}$
HongXiong Liu, JingYu Yao, JianMin Shi, ZhiLong Yang, DaYu Yan, Yong Li, DaiHong Chen, Hai L. Feng, ShiLiang Li, ZhiJun Wang, and YouGuo Shi
Author(s): HongXiong Liu, JingYu Yao, JianMin Shi, ZhiLong Yang, DaYu Yan, Yong Li, DaiHong Chen, Hai L. Feng, ShiLiang Li, ZhiJun Wang, and YouGuo Shi

Superconductivity in V-based kagome metals has recently raised great interest as they exhibit the competing ground states associated with the flat bands and topological electronic structures. Here we report the discovery of superconductivity in ${\mathrm{Ta}}_{2}{\mathrm{V}}_{3.1}{\mathrm{Si}}_{0.9}…


[Phys. Rev. B 108, 104504] Published Wed Sep 13, 2023

Structure, physical properties, and magnetically tunable topological phases in the topological semimetal EuCuBi
Xuhui Wang, Boxuan Li, Liqin Zhou, Long Chen, Yulong Wang, Yaling Yang, Ying Zhou, Ke Liao, Hongming Weng, and Gang Wang
Author(s): Xuhui Wang, Boxuan Li, Liqin Zhou, Long Chen, Yulong Wang, Yaling Yang, Ying Zhou, Ke Liao, Hongming Weng, and Gang Wang

A single material achieving multiple topological phases can provide potential application for topological spintronics, whereas the candidate materials are very limited. Here, we report on the structure, physical properties, and possible emergence of multiple topological phases in the recently discov…


[Phys. Rev. B 108, 115126] Published Wed Sep 13, 2023

Thermopower in hBN/graphene/hBN superlattices
Victor H. Guarochico-Moreira, Christopher R. Anderson, Vladimir Fal'ko, Irina V. Grigorieva, Endre Tóvári, Matthew Hamer, Roman Gorbachev, Song Liu, James H. Edgar, Alessandro Principi, Andrey V. Kretinin, and Ivan J. Vera-Marun
Author(s): Victor H. Guarochico-Moreira, Christopher R. Anderson, Vladimir Fal'ko, Irina V. Grigorieva, Endre Tóvári, Matthew Hamer, Roman Gorbachev, Song Liu, James H. Edgar, Alessandro Principi, Andrey V. Kretinin, and Ivan J. Vera-Marun

Thermoelectric effects are highly sensitive to the asymmetry in the density of states around the Fermi energy and can be exploited as probes of the electronic structure. We experimentally study thermopower in high-quality monolayer graphene, within heterostructures consisting of complete hBN encapsu…


[Phys. Rev. B 108, 115418] Published Wed Sep 13, 2023

Maximally localized exciton Wannier functions for solids
Jonah B. Haber, Diana Y. Qiu, Felipe H. da Jornada, and Jeffrey B. Neaton
Author(s): Jonah B. Haber, Diana Y. Qiu, Felipe H. da Jornada, and Jeffrey B. Neaton

Over 25 years ago, Marzari and Vanderbilt introduced maximally localized Wannier functions (MLWFs), the most compact real-space representation of electronic wavefunctions in solids. Here, the authors put forward a generalization of this scheme for excitons, correlated electron-hole pairs that dictate the optical properties of materials. Much as MLWFs have transformed our understanding of electrons in solids, from chemical bonding to polarization to topology, these maximally localized exciton Wannier functions should deepen our understanding of photophysical and excited-state phenomena of materials.


[Phys. Rev. B 108, 125118] Published Wed Sep 13, 2023

Oxygen pressure modulated magnetism and magnetic anisotropy of epitaxial transparent ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ pyrochlore films
Ming-Yuan Yan, Zhen-Tao Pang, Zhao-Cai Wang, Zhong-Nan Xi, Li- Da Chen, Xiao-Yu Zhang, Yu-Qi Wang, Ren-Kui Zheng, Yu Deng, and Shan-Tao Zhang
Author(s): Ming-Yuan Yan, Zhen-Tao Pang, Zhao-Cai Wang, Zhong-Nan Xi, Li- Da Chen, Xiao-Yu Zhang, Yu-Qi Wang, Ren-Kui Zheng, Yu Deng, and Shan-Tao Zhang

Pyrochlore ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ has gained significant attention due to the low-temperature geometrical frustration induced unusual magnetic phase. Most experimental studies on ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ have been performed on polycrystalline…


[Phys. Rev. B 108, 094105] Published Tue Sep 12, 2023

Found 20 papers in prl
Date of feed: Tue, 19 Sep 2023 03:17:27 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Control of Active Brownian Particles: An Exact Solution
Marco Baldovin, David Guéry-Odelin, and Emmanuel Trizac
Author(s): Marco Baldovin, David Guéry-Odelin, and Emmanuel Trizac

Control of stochastic systems is a challenging open problem in statistical physics, with a wealth of potential applications from biology to granulates. Unlike most cases investigated so far, we aim here at controlling a genuinely out-of-equilibrium system, the two dimensional active Brownian particl…


[Phys. Rev. Lett. 131, 118302] Published Thu Sep 14, 2023

Proof-of-Principle Demonstration of Fully Passive Quantum Key Distribution
Chengqiu Hu, Wenyuan Wang, Kai-Sum Chan, Zhenghan Yuan, and Hoi-Kwong Lo
Author(s): Chengqiu Hu, Wenyuan Wang, Kai-Sum Chan, Zhenghan Yuan, and Hoi-Kwong Lo

Quantum key distribution (QKD) offers information-theoretic security based on the fundamental laws of physics. However, device imperfections, such as those in active modulators, may introduce side-channel leakage, thus compromising practical security. Attempts to remove active modulation, including …


[Phys. Rev. Lett. 131, 110801] Published Wed Sep 13, 2023

Kolmogorov Turbulence Coexists with Pseudo-Turbulence in Buoyancy-Driven Bubbly Flows
Vikash Pandey, Dhrubaditya Mitra, and Prasad Perlekar
Author(s): Vikash Pandey, Dhrubaditya Mitra, and Prasad Perlekar

We investigate the spectral properties of buoyancy-driven bubbly flows. Using high-resolution numerical simulations and phenomenology of homogeneous turbulence, we identify the relevant energy transfer mechanisms. We find (a) at a high enough Galilei number (ratio of the buoyancy to viscous forces) …


[Phys. Rev. Lett. 131, 114002] Published Wed Sep 13, 2023

Probing the Dark Sector with Nuclear Transition Photons
Bhaskar Dutta, Wei-Chih Huang, and Jayden L. Newstead
Author(s): Bhaskar Dutta, Wei-Chih Huang, and Jayden L. Newstead

Here we present world-leading sensitivity to light ($<170\text{ }\text{ }\mathrm{MeV}$) dark matter (DM) using beam-dump experiments. Dark sector particles produced during pion decay at accelerator beam dumps can be detected via scattering in neutrino detectors. The decay of nuclei excited by the…


[Phys. Rev. Lett. 131, 111801] Published Tue Sep 12, 2023

Unlimited One-Way Steering
Pavel Sekatski, Florian Giraud, Roope Uola, and Nicolas Brunner
Author(s): Pavel Sekatski, Florian Giraud, Roope Uola, and Nicolas Brunner

This work explores the asymmetry of quantum steering in a setup using high-dimensional entanglement. We construct entangled states with the following properties: (i) one party (Bob) can never steer the state of the other party (Alice), considering the most general measurements, and (ii) Alice can st…


[Phys. Rev. Lett. 131, 110201] Published Mon Sep 11, 2023

Evidence for Suppression of Structure Growth in the Concordance Cosmological Model
Nhat-Minh Nguyen, Dragan Huterer, and Yuewei Wen
Author(s): Nhat-Minh Nguyen, Dragan Huterer, and Yuewei Wen

A joint analysis of data from the CMB, weak lensing, peculiar velocities, and galaxy clustering, shows that an extension of the concordance cosmological model which includes the suppression of the growth of cosmic structure can alleviate two widely discussed cosmological tensions.


[Phys. Rev. Lett. 131, 111001] Published Mon Sep 11, 2023

$Q$-Ball Superradiance
Paul M. Saffin, Qi-Xin Xie, and Shuang-Yong Zhou
Author(s): Paul M. Saffin, Qi-Xin Xie, and Shuang-Yong Zhou

$Q$-balls are nontopological solitons that coherently rotate in field space. We show that these coherent rotations can induce superradiance for scattering waves, thanks to the fact that the scattering involves two coupled modes. Despite the conservation of the particle number in the scattering, the …


[Phys. Rev. Lett. 131, 111601] Published Mon Sep 11, 2023

Paramagnetic Singularities of the Orbital Magnetism in Graphene with a Moiré Potential
J. Vallejo Bustamante, R. Ribeiro-Palau, C. Fermon, M. Pannetier-Lecoeur, K. Watanabe, T. Tanigushi, R. Deblock, S. Guéron, M. Ferrier, J. N. Fuchs, G. Montambaux, F. Piéchon, and H. Bouchiat
Author(s): J. Vallejo Bustamante, R. Ribeiro-Palau, C. Fermon, M. Pannetier-Lecoeur, K. Watanabe, T. Tanigushi, R. Deblock, S. Guéron, M. Ferrier, J. N. Fuchs, G. Montambaux, F. Piéchon, and H. Bouchiat

Magnetization measurements on graphene/hBN samples in a wide range of chemical potential reveal paramagnetism at saddle points of the moiré band structure.


[Phys. Rev. Lett. 131, 116201] Published Mon Sep 11, 2023

Control of the Bright-Dark Exciton Splitting Using the Lamb Shift in a Two-Dimensional Semiconductor
L. Ren (任磊), C. Robert, M. Glazov, M. Semina, T. Amand, L. Lombez, D. Lagarde, T. Taniguchi, K. Watanabe, and X. Marie
Author(s): L. Ren (任磊), C. Robert, M. Glazov, M. Semina, T. Amand, L. Lombez, D. Lagarde, T. Taniguchi, K. Watanabe, and X. Marie

We investigate the exciton fine structure in atomically thin ${\mathrm{WSe}}_{2}$-based van der Waals heterostructures where the density of optical modes at the location of the semiconductor monolayer can be tuned. The energy splitting $\mathrm{Δ}$ between the bright and dark exciton is measured by …


[Phys. Rev. Lett. 131, 116901] Published Mon Sep 11, 2023

Topological Inverse Band Theory in Waveguide Quantum Electrodynamics
Yongguan Ke, Jiaxuan Huang, Wenjie Liu, Yuri Kivshar, and Chaohong Lee
Author(s): Yongguan Ke, Jiaxuan Huang, Wenjie Liu, Yuri Kivshar, and Chaohong Lee

Topological phases play a crucial role in the fundamental physics of light-matter interaction and emerging applications of quantum technologies. However, the topological band theory of waveguide QED systems is known to break down, because the energy bands become disconnected. Here, we introduce a co…


[Phys. Rev. Lett. 131, 103604] Published Fri Sep 08, 2023

Nanoscale Transport during Liquid Film Thinning Inhibits Bubble Coalescing Behavior in Electrolyte Solutions
Bo Liu, Rogerio Manica, Qingxia Liu, Zhenghe Xu, Evert Klaseboer, and Qiang Yang
Author(s): Bo Liu, Rogerio Manica, Qingxia Liu, Zhenghe Xu, Evert Klaseboer, and Qiang Yang

Observations of air-bubble mergers in water explain why dissolved salt slows this process and leads to foam.


[Phys. Rev. Lett. 131, 104003] Published Fri Sep 08, 2023

Fractionalization in Fractional Correlated Insulating States at $n±1/3$ Filled Twisted Bilayer Graphene
Dan Mao, Kevin Zhang, and Eun-Ah Kim
Author(s): Dan Mao, Kevin Zhang, and Eun-Ah Kim

Fractionalization without time-reversal symmetry breaking is a long-sought-after goal in the study of correlated phenomena. The earlier proposal of correlated insulating states at $n±1/3$ filling in twisted bilayer graphene and recent experimental observations of insulating states at those fillings …


[Phys. Rev. Lett. 131, 106801] Published Fri Sep 08, 2023

Non-Hermitian Waveguide Cavity QED with Tunable Atomic Mirrors
Wei Nie, Tao Shi, Yu-xi Liu, and Franco Nori
Author(s): Wei Nie, Tao Shi, Yu-xi Liu, and Franco Nori

Optical mirrors determine cavity properties by means of light reflection. Imperfect reflection gives rise to open cavities with photon loss. We study an open cavity made of atom-dimer mirrors with a tunable reflection spectrum. We find that the atomic cavity shows anti-$\mathcal{PT}$ symmetry. The a…


[Phys. Rev. Lett. 131, 103602] Published Thu Sep 07, 2023

Effects of Laser Bandwidth in Direct-Drive High-Performance DT-Layered Implosions on the OMEGA Laser
D. Patel, J. P. Knauer, D. Cao, R. Betti, R. Nora, A. Shvydky, V. Gopalaswamy, A. Lees, S. Sampat, W. R. Donaldson, S. P. Regan, C. Stoeckl, C. J. Forrest, V. Yu. Glebov, D. R. Harding, M. J. Bonino, R. T. Janezic, D. Wasilewski, C. Fella, C. Shuldberg, J. Murray, D. Guzman, and B. Serrato
Author(s): D. Patel, J. P. Knauer, D. Cao, R. Betti, R. Nora, A. Shvydky, V. Gopalaswamy, A. Lees, S. Sampat, W. R. Donaldson, S. P. Regan, C. Stoeckl, C. J. Forrest, V. Yu. Glebov, D. R. Harding, M. J. Bonino, R. T. Janezic, D. Wasilewski, C. Fella, C. Shuldberg, J. Murray, D. Guzman, and B. Serrato

In direct-drive inertial confinement fusion, the laser bandwidth reduces the laser imprinting seed of hydrodynamic instabilities. The impact of varying bandwidth on the performance of direct-drive DT-layered implosions was studied in targets with different hydrodynamic stability properties. The stab…


[Phys. Rev. Lett. 131, 105101] Published Thu Sep 07, 2023

Failure of Topological Invariants in Strongly Correlated Matter
Jinchao Zhao, Peizhi Mai, Barry Bradlyn, and Philip Phillips
Author(s): Jinchao Zhao, Peizhi Mai, Barry Bradlyn, and Philip Phillips

When zeros appear in the Green’s function, as in strongly correlated systems, the invariant N3 for the two-dimensional quantum anomalous Hall insulator does not necessarily encode a topological invariant of the ground state, in contrast to expectations.


[Phys. Rev. Lett. 131, 106601] Published Thu Sep 07, 2023

Nonreciprocal Cahn-Hilliard Model Emerges as a Universal Amplitude Equation
Tobias Frohoff-Hülsmann and Uwe Thiele
Author(s): Tobias Frohoff-Hülsmann and Uwe Thiele

Oscillatory behavior is ubiquitous in out-of-equilibrium systems showing spatiotemporal pattern formation. Starting from a linear large-scale oscillatory instability—a conserved-Hopf instability—that naturally occurs in many active systems with two conservation laws, we derive a corresponding amplit…


[Phys. Rev. Lett. 131, 107201] Published Thu Sep 07, 2023

Exact Dirac–Bogoliubov–de Gennes Dynamics for Inhomogeneous Quantum Liquids
Per Moosavi
Author(s): Per Moosavi

We study inhomogeneous $1+1$-dimensional quantum many-body systems described by Tomonaga-Luttinger-liquid theory with general propagation velocity and Luttinger parameter varying smoothly in space, equivalent to an inhomogeneous compactification radius for free boson conformal field theory. This mod…


[Phys. Rev. Lett. 131, 100401] Published Wed Sep 06, 2023

Measurement of Hyperfine Structure and the Zemach Radius in $^{6}{\mathrm{Li}}^{+}$ Using Optical Ramsey Technique
Wei Sun, Pei-Pei Zhang, Peng-peng Zhou, Shao-long Chen, Zhi-qiang Zhou, Yao Huang, Xiao-Qiu Qi, Zong-Chao Yan, Ting-Yun Shi, G. W. F. Drake, Zhen-Xiang Zhong, Hua Guan, and Ke-lin Gao
Author(s): Wei Sun, Pei-Pei Zhang, Peng-peng Zhou, Shao-long Chen, Zhi-qiang Zhou, Yao Huang, Xiao-Qiu Qi, Zong-Chao Yan, Ting-Yun Shi, G. W. F. Drake, Zhen-Xiang Zhong, Hua Guan, and Ke-lin Gao

We investigate the $2^{3}{S}_{1}–2^{3}{P}_{J}$ ($J=0$, 1, 2) transitions in $^{6}{\mathrm{Li}}^{+}$ using the optical Ramsey technique and achieve the most precise values of the hyperfine splittings of the $2^{3}{S}_{1}$ and $2^{3}{P}_{J}$ states, with smallest uncertainty of about 10 kHz. The prese…


[Phys. Rev. Lett. 131, 103002] Published Wed Sep 06, 2023

Surprising Charge-Radius Kink in the Sc Isotopes at $N=20$
Kristian König, Stephan Fritzsche, Gaute Hagen, Jason D. Holt, Andrew Klose, Jeremy Lantis, Yuan Liu, Kei Minamisono, Takayuki Miyagi, Witold Nazarewicz, Thomas Papenbrock, Skyy V. Pineda, Robert Powel, and Paul-Gerhard Reinhard
Author(s): Kristian König, Stephan Fritzsche, Gaute Hagen, Jason D. Holt, Andrew Klose, Jeremy Lantis, Yuan Liu, Kei Minamisono, Takayuki Miyagi, Witold Nazarewicz, Thomas Papenbrock, Skyy V. Pineda, Robert Powel, and Paul-Gerhard Reinhard

Charge radii of neutron deficient $^{40}\mathrm{Sc}$ and $^{41}\mathrm{Sc}$ nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number $N=20$ and shows a pronounced kink, generally taken as a signature of a shell …


[Phys. Rev. Lett. 131, 102501] Published Tue Sep 05, 2023

Imaging-Assisted Single-Photon Doppler-Free Laser Spectroscopy and the Ionization Energy of Metastable Triplet Helium
Gloria Clausen, Simon Scheidegger, Josef A. Agner, Hansjürg Schmutz, and Frédéric Merkt
Author(s): Gloria Clausen, Simon Scheidegger, Josef A. Agner, Hansjürg Schmutz, and Frédéric Merkt

Skimmed supersonic beams provide intense, cold, collision-free samples of atoms and molecules and are one of the most widely used tools in atomic and molecular laser spectroscopy. High-resolution optical spectra are typically recorded in a perpendicular arrangement of laser and supersonic beams to m…


[Phys. Rev. Lett. 131, 103001] Published Tue Sep 05, 2023

Found 21 papers in prx
Date of feed: Tue, 19 Sep 2023 03:17:27 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Quantized Charge Polarization as a Many-Body Invariant in $(2+1)\mathrm{D}$ Crystalline Topological States and Hofstadter Butterflies
Yuxuan Zhang, Naren Manjunath, Gautam Nambiar, and Maissam Barkeshli
Author(s): Yuxuan Zhang, Naren Manjunath, Gautam Nambiar, and Maissam Barkeshli

A theoretical analysis shows that a quantized charge polarization is well-defined in an insulator with a magnetic field and nonzero quantized Hall conductance, offering an inroad to a deeper understanding of crystalline topological phases.


[Phys. Rev. X 13, 031005] Published Fri Jul 14, 2023

Creation of Optical Cat and GKP States Using Shaped Free Electrons
Raphael Dahan, Gefen Baranes, Alexey Gorlach, Ron Ruimy, Nicholas Rivera, and Ido Kaminer
Author(s): Raphael Dahan, Gefen Baranes, Alexey Gorlach, Ron Ruimy, Nicholas Rivera, and Ido Kaminer

A new approach to generating quantum states of light most suitable for robust quantum computing draws on one of the most basic interactions in physics—the interaction between free electrons and photons.


[Phys. Rev. X 13, 031001] Published Thu Jul 06, 2023

Emergence of Geometric Turing Patterns in Complex Networks
Jasper van der Kolk, Guillermo García-Pérez, Nikos E. Kouvaris, M. Ángeles Serrano, and Marián Boguñá
Author(s): Jasper van der Kolk, Guillermo García-Pérez, Nikos E. Kouvaris, M. Ángeles Serrano, and Marián Boguñá

By describing network topology using an underlying geometric space, spatial Turing patterns can be found in the geometric embeddings of real networks.


[Phys. Rev. X 13, 021038] Published Thu Jun 22, 2023

Performing $\mathrm{SU}(d)$ Operations and Rudimentary Algorithms in a Superconducting Transmon Qudit for $d=3$ and $d=4$
Pei Liu, Ruixia Wang, Jing-Ning Zhang, Yingshan Zhang, Xiaoxia Cai, Huikai Xu, Zhiyuan Li, Jiaxiu Han, Xuegang Li, Guangming Xue, Weiyang Liu, Li You, Yirong Jin, and Haifeng Yu
Author(s): Pei Liu, Ruixia Wang, Jing-Ning Zhang, Yingshan Zhang, Xiaoxia Cai, Huikai Xu, Zhiyuan Li, Jiaxiu Han, Xuegang Li, Guangming Xue, Weiyang Liu, Li You, Yirong Jin, and Haifeng Yu

A multilevel qubit, or “qudit,” in a superconducting transmon shows high fidelity with several rudimentary algorithms, demonstrating the potential of a quantum computing architecture based on up to four levels rather than just two.


[Phys. Rev. X 13, 021028] Published Tue May 23, 2023

Non-Abelian Frame Charge Flow in Photonic Media
Dongyang Wang, Ying Wu, Z. Q. Zhang, and C. T. Chan
Author(s): Dongyang Wang, Ying Wu, Z. Q. Zhang, and C. T. Chan

Non-Abelian frame charges—mathematical entities used to describe certain topological properties—can also help understand band degeneracies in ordinary optical media.


[Phys. Rev. X 13, 021024] Published Tue May 16, 2023

Gravitational-Wave Detector for Postmerger Neutron Stars: Beyond the Quantum Loss Limit of the Fabry-Perot-Michelson Interferometer
Teng Zhang, Huan Yang, Denis Martynov, Patricia Schmidt, and Haixing Miao
Author(s): Teng Zhang, Huan Yang, Denis Martynov, Patricia Schmidt, and Haixing Miao

A simple modification to gravitational wave detector designs could allow future observatories to study the postmerger physics of a binary neutron star merger, to which current facilities are not sensitive.


[Phys. Rev. X 13, 021019] Published Thu May 04, 2023

Consistent Quantization of Nearly Singular Superconducting Circuits
Martin Rymarz and David P. DiVincenzo
Author(s): Martin Rymarz and David P. DiVincenzo

An analysis of a common approach to describing singular superconducting circuits quantum mechanically shows that it can lead to wrong predictions of the system’s dynamics.


[Phys. Rev. X 13, 021017] Published Mon May 01, 2023

Emergent $s$-Wave Interactions between Identical Fermions in Quasi-One-Dimensional Geometries
Kenneth G. Jackson, Colin J. Dale, Jeff Maki, Kevin G. S. Xie, Ben A. Olsen, Denise J. M. Ahmed-Braun, Shizhong Zhang, and Joseph H. Thywissen
Author(s): Kenneth G. Jackson, Colin J. Dale, Jeff Maki, Kevin G. S. Xie, Ben A. Olsen, Denise J. M. Ahmed-Braun, Shizhong Zhang, and Joseph H. Thywissen

The wave function of fermions always acquires a minus sign when particles trade places. But an experiment shows that fermions confined to a quasi-one-dimensional space seem to circumvent this exchange symmetry.


[Phys. Rev. X 13, 021013] Published Tue Apr 25, 2023

Symmetries as the Guiding Principle for Flattening Bands of Dirac Fermions
Yarden Sheffer, Raquel Queiroz, and Ady Stern
Author(s): Yarden Sheffer, Raquel Queiroz, and Ady Stern

A new criterion for determining what materials can be fine-tuned to have very slowly moving electrons could lead to new platforms for studying novel phenomena arising from electron correlation.


[Phys. Rev. X 13, 021012] Published Mon Apr 24, 2023

Single-Molecule Structure and Topology of Kinetoplast DNA Networks
Pinyao He, Allard J. Katan, Luca Tubiana, Cees Dekker, and Davide Michieletto
Author(s): Pinyao He, Allard J. Katan, Luca Tubiana, Cees Dekker, and Davide Michieletto

This high-resolution imaging study investigates a unique interlinked DNA found in certain single-cell parasites and reveals the genome’s unusual structure and topology at single-molecule resolution.


[Phys. Rev. X 13, 021010] Published Wed Apr 19, 2023

Protecting the Quantum Interference of Cat States by Phase-Space Compression
Xiaozhou Pan, Jonathan Schwinger, Ni-Ni Huang, Pengtao Song, Weipin Chua, Fumiya Hanamura, Atharv Joshi, Fernando Valadares, Radim Filip, and Yvonne Y. Gao
Author(s): Xiaozhou Pan, Jonathan Schwinger, Ni-Ni Huang, Pengtao Song, Weipin Chua, Fumiya Hanamura, Atharv Joshi, Fernando Valadares, Radim Filip, and Yvonne Y. Gao

Compressing the spectral content of quantum interference features in Schrödinger cat states to lower frequencies protects them against photon loss and preserves the most valuable characteristics that enable many quantum technologies.


[Phys. Rev. X 13, 021004] Published Fri Apr 07, 2023

Nonlocal Temporal Interferometry for Highly Resilient Free-Space Quantum Communication
Lukas Bulla, Matej Pivoluska, Kristian Hjorth, Oskar Kohout, Jan Lang, Sebastian Ecker, Sebastian P. Neumann, Julius Bittermann, Robert Kindler, Marcus Huber, Martin Bohmann, and Rupert Ursin
Author(s): Lukas Bulla, Matej Pivoluska, Kristian Hjorth, Oskar Kohout, Jan Lang, Sebastian Ecker, Sebastian P. Neumann, Julius Bittermann, Robert Kindler, Marcus Huber, Martin Bohmann, and Rupert Ursin

High-dimensional entanglement among photons allows for a roughly 10-km free-space quantum communication link in an urban environment that is robust to noise.


[Phys. Rev. X 13, 021001] Published Mon Apr 03, 2023

Measuring Arbitrary Physical Properties in Analog Quantum Simulation
Minh C. Tran, Daniel K. Mark, Wen Wei Ho, and Soonwon Choi
Author(s): Minh C. Tran, Daniel K. Mark, Wen Wei Ho, and Soonwon Choi

A new protocol for measuring the state of a quantum simulator allows for the extraction of arbitrary physical information by relying on ancillary degrees of freedom and the natural randomness of quantum dynamics.


[Phys. Rev. X 13, 011049] Published Thu Mar 30, 2023

Terahertz Vibrational Molecular Clock with Systematic Uncertainty at the ${10}^{−14}$ Level
K. H. Leung, B. Iritani, E. Tiberi, I. Majewska, M. Borkowski, R. Moszynski, and T. Zelevinsky
Author(s): K. H. Leung, B. Iritani, E. Tiberi, I. Majewska, M. Borkowski, R. Moszynski, and T. Zelevinsky

Researchers have attained a 100-fold increase in the accuracy of a molecular clock that could serve as a terahertz-frequency standard and as a platform for investigating new physics.


[Phys. Rev. X 13, 011047] Published Tue Mar 28, 2023

Coherent Fluctuations in Noisy Mesoscopic Systems, the Open Quantum SSEP, and Free Probability
Ludwig Hruza and Denis Bernard
Author(s): Ludwig Hruza and Denis Bernard

Fluctuations of quantum mechanical coherences in small, nonequilibrium systems can be described by a universal mathematical framework that draws from free probability theory, a tool that may aid understanding of noisy many-body quantum systems.


[Phys. Rev. X 13, 011045] Published Fri Mar 24, 2023

Disordered Heterogeneous Universe: Galaxy Distribution and Clustering across Length Scales
Oliver H. E. Philcox and Salvatore Torquato
Author(s): Oliver H. E. Philcox and Salvatore Torquato

A new methodology for analyzing the 3D distribution of galaxies borrows techniques from the study of colloids and other disordered materials.


[Phys. Rev. X 13, 011038] Published Tue Mar 14, 2023

Appropriate Mechanical Confinement Inhibits Multipolar Cell Division via Pole-Cortex Interaction
Longcan Cheng, Jingchen Li, Houbo Sun, and Hongyuan Jiang
Author(s): Longcan Cheng, Jingchen Li, Houbo Sun, and Hongyuan Jiang

Segregation of chromosomes in dividing cells can be disrupted if the cells are constrained by their surroundings.


[Phys. Rev. X 13, 011036] Published Fri Mar 10, 2023

Large Topological Hall Effect and Spiral Magnetic Order in the Weyl Semimetal SmAlSi
Xiaohan Yao, Jonathan Gaudet, Rahul Verma, David E. Graf, Hung-Yu Yang, Faranak Bahrami, Ruiqi Zhang, Adam A. Aczel, Sujan Subedi, Darius H. Torchinsky, Jianwei Sun, Arun Bansil, Shin-Ming Huang, Bahadur Singh, Peter Blaha, Predrag Nikolić, and Fazel Tafti
Author(s): Xiaohan Yao, Jonathan Gaudet, Rahul Verma, David E. Graf, Hung-Yu Yang, Faranak Bahrami, Ruiqi Zhang, Adam A. Aczel, Sujan Subedi, Darius H. Torchinsky, Jianwei Sun, Arun Bansil, Shin-Ming Huang, Bahadur Singh, Peter Blaha, Predrag Nikolić, and Fazel Tafti

The first demonstration of spiral magnetic order in a Weyl semimetal sets the stage for finding other materials with these structures, which could be used for high-density magnetic information storage.


[Phys. Rev. X 13, 011035] Published Thu Mar 09, 2023

Comparing Fractional Quantum Hall Laughlin and Jain Topological Orders with the Anyon Collider
M. Ruelle, E. Frigerio, J.-M. Berroir, B. Plaçais, J. Rech, A. Cavanna, U. Gennser, Y. Jin, and G. Fève
Author(s): M. Ruelle, E. Frigerio, J.-M. Berroir, B. Plaçais, J. Rech, A. Cavanna, U. Gennser, Y. Jin, and G. Fève

An anyon collider can distinguish between two types of anyons associated with two fractional quantum Hall states of a 2D electron gas, a step toward further investigation of anyons deemed useful for quantum computing.


[Phys. Rev. X 13, 011031] Published Fri Mar 03, 2023

Quantum Dynamics of Attractive and Repulsive Polarons in a Doped ${\mathrm{MoSe}}_{2}$ Monolayer
Di Huang, Kevin Sampson, Yue Ni, Zhida Liu, Danfu Liang, Kenji Watanabe, Takashi Taniguchi, Hebin Li, Eric Martin, Jesper Levinsen, Meera M. Parish, Emanuel Tutuc, Dmitry K. Efimkin, and Xiaoqin Li
Author(s): Di Huang, Kevin Sampson, Yue Ni, Zhida Liu, Danfu Liang, Kenji Watanabe, Takashi Taniguchi, Hebin Li, Eric Martin, Jesper Levinsen, Meera M. Parish, Emanuel Tutuc, Dmitry K. Efimkin, and Xiaoqin Li

Experiments reveal previously unknown quantum dynamics of quasiparticles called attractive and repulsive polarons in an ultrathin semiconductor.


[Phys. Rev. X 13, 011029] Published Thu Mar 02, 2023

Interference Measurements of Non-Abelian $e/4$ & Abelian $e/2$ Quasiparticle Braiding
R. L. Willett, K. Shtengel, C. Nayak, L. N. Pfeiffer, Y. J. Chung, M. L. Peabody, K. W. Baldwin, and K. W. West
Author(s): R. L. Willett, K. Shtengel, C. Nayak, L. N. Pfeiffer, Y. J. Chung, M. L. Peabody, K. W. Baldwin, and K. W. West

A novel GaAs interferometer provides experimental evidence that strengthens the case for non-Abelian anyons, hypothetical quasiparticles highly sought for use in topologically protected quantum computing.


[Phys. Rev. X 13, 011028] Published Wed Mar 01, 2023

Found 11 papers in pr_res
Date of feed: Tue, 19 Sep 2023 03:17:24 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Exploring energy landscapes of charge multipoles using constrained density functional theory
Luca Schaufelberger, Maximilian E. Merkel, Aria Mansouri Tehrani, Nicola A. Spaldin, and Claude Ederer
Author(s): Luca Schaufelberger, Maximilian E. Merkel, Aria Mansouri Tehrani, Nicola A. Spaldin, and Claude Ederer

We present a method to constrain local charge multipoles within density-functional theory. Such multipoles quantify the anisotropy of the local charge distribution around atomic sites and can indicate potential hidden orders. Our method allows selective control of specific multipoles, facilitating a…


[Phys. Rev. Research 5, 033172] Published Fri Sep 08, 2023

Error-tolerant oblivious transfer in the noisy-storage model
Cosmo Lupo, James T. Peat, Erika Andersson, and Pieter Kok
Author(s): Cosmo Lupo, James T. Peat, Erika Andersson, and Pieter Kok

The noisy-storage model of quantum cryptography allows for information-theoretically secure two-party computation based on the assumption that a cheating user has at most access to an imperfect, noisy quantum memory, whereas the honest users do not need a quantum memory at all. In general, the more …


[Phys. Rev. Research 5, 033163] Published Thu Sep 07, 2023

Quantum computing on magnetic racetracks with flying domain wall qubits
Ji Zou, Stefano Bosco, Banabir Pal, Stuart S. P. Parkin, Jelena Klinovaja, and Daniel Loss
Author(s): Ji Zou, Stefano Bosco, Banabir Pal, Stuart S. P. Parkin, Jelena Klinovaja, and Daniel Loss

Domain walls (DWs) on magnetic racetracks are at the core of the field of spintronics, providing a basic element for classical information processing. Here, we show that mobile DWs also provide a blueprint for large-scale quantum computers. Remarkably, these DW qubits showcase exceptional versatilit…


[Phys. Rev. Research 5, 033166] Published Thu Sep 07, 2023

Spectral topology and its relation to Fermi arcs in strongly correlated systems
Johan Carlström
Author(s): Johan Carlström

Fermi gases and liquids display an excitation spectrum that is simply connected, ensuring closed Fermi surfaces. In strongly correlated systems such as the cuprate superconductors, the existence of open sheets of Fermi surface known as Fermi arcs indicate a distinctly different topology of the spect…


[Phys. Rev. Research 5, 033160] Published Wed Sep 06, 2023

Ultrafast stroboscopic time-resolved magneto-optical imaging of domain wall motion in Pt/GdFeCo wires induced by a current pulse
Kazuma Ogawa, Naotaka Yoshikawa, Mio Ishibashi, Kay Yakushiji, Arata Tsukamoto, Masamitsu Hayashi, and Ryo Shimano
Author(s): Kazuma Ogawa, Naotaka Yoshikawa, Mio Ishibashi, Kay Yakushiji, Arata Tsukamoto, Masamitsu Hayashi, and Ryo Shimano

Fast and accurate current-driven manipulation of magnetic domain walls (DWs) is crucial for the realization of high-performance spintronic devices. Conventional methods to observe current-induced DW motion (CIDWM) require the accumulative measurement of magnetization dynamics, which is in general in…


[Phys. Rev. Research 5, 033151] Published Fri Sep 01, 2023

Graph-theoretic characterization of unextendible product bases
Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella
Author(s): Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella

Unextendible product bases (UPBs) play a key role in the study of quantum entanglement and nonlocality. Here we provide an equivalent characterization of UPBs in graph-theoretic terms. Different from previous graph-theoretic investigations of UPBs, which focused mostly on the orthogonality relations…


[Phys. Rev. Research 5, 033144] Published Thu Aug 31, 2023

Topological Josephson junctions in the integer quantum Hall regime
Gianmichele Blasi, Géraldine Haack, Vittorio Giovannetti, Fabio Taddei, and Alessandro Braggio
Author(s): Gianmichele Blasi, Géraldine Haack, Vittorio Giovannetti, Fabio Taddei, and Alessandro Braggio

Robust and tunable topological Josephson junctions (TJJs) are highly desirable platforms for investigating the anomalous Josephson effect and topological quantum computation applications. Experimental demonstrations have been done in hybrid superconducting-two dimensional topological insulator (2DTI…


[Phys. Rev. Research 5, 033142] Published Wed Aug 30, 2023

Polymerization in magnetic metamaterials
Samuel D. Slöetjes, Matías P. Grassi, and Vassilios Kapaklis
Author(s): Samuel D. Slöetjes, Matías P. Grassi, and Vassilios Kapaklis

Ring-shaped mesoscopic magnetic islands are shown to bond to neighboring islands through stray fields, facilitated by the topology of the magnetization textures. This bonding process shares similarities with polymerization observed in molecular networks. The thermal properties are investigated and can be seen to result in the emergence of structures that percolate throughout the lattice of magnetic islands.


[Phys. Rev. Research 5, L032029] Published Wed Aug 30, 2023

Adiabatic pumping and transport in the Sierpinski-Hofstadter model
Saswat Sarangi and Anne E. B. Nielsen
Author(s): Saswat Sarangi and Anne E. B. Nielsen

Topological phases have been reported on self-similar structures in the presence of a perpendicular magnetic field. Here, we present an understanding of these phases from a perspective of spectral flow and charge pumping. We study the Harper-Hofstadter model on self-similar structures constructed fr…


[Phys. Rev. Research 5, 033132] Published Fri Aug 25, 2023

Plasmon wake in anisotropic two-dimensional materials
Zoran L. Mišković and Milad Moshayedi
Author(s): Zoran L. Mišković and Milad Moshayedi

We use analytically tractable dielectric response models, which are supported by ab initio calculations for anisotropic two-dimensional (2D) materials and quasi-2D metals that host slow plasmons, to reveal a rich variety of the plasmonic wake patterns in the electric potential induced by a charged p…


[Phys. Rev. Research 5, 033133] Published Fri Aug 25, 2023

Fractional Landau-Lifshitz-Gilbert equation
R. C. Verstraten, T. Ludwig, R. A. Duine, and C. Morais Smith
Author(s): R. C. Verstraten, T. Ludwig, R. A. Duine, and C. Morais Smith

The dynamics of a magnetic moment or spin are of high interest to applications in technology. Dissipation in these systems is therefore of importance for improvement of efficiency of devices, such as the ones proposed in spintronics. A large spin in a magnetic field is widely assumed to be described…


[Phys. Rev. Research 5, 033128] Published Thu Aug 24, 2023

Found 17 papers in acs-nano
Date of feed: Mon, 18 Sep 2023 13:04:02 GMT

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

[ASAP] Isomer Discrimination via Defect Engineering in Monolayer MoS2
Bin Han, Sai Manoj Gali, Shuting Dai, David Beljonne, and Paolo Samorì

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c04194

[ASAP] Highly Durable and Efficient Seawater Electrolysis Enabled by Defective Graphene-Confined Nanoreactor
Zhichao Gong, Jingjing Liu, Minmin Yan, Haisheng Gong, Gonglan Ye, and Huilong Fei

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c05749

[ASAP] Graphene Field Effect Biosensor for Concurrent and Specific Detection of SARS-CoV-2 and Influenza
Neelotpala Kumar, Dalton Towers, Samantha Myers, Cooper Galvin, Dmitry Kireev, Andrew D. Ellington, and Deji Akinwande

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c07707

[ASAP] Probing the Twist-Controlled Interlayer Coupling in Artificially Stacked Transition Metal Dichalcogenide Bilayers by Second-Harmonic Generation
Yuanjian Yuan, Peng Liu, Hongjian Wu, Haitao Chen, Weihao Zheng, Gang Peng, Zhihong Zhu, Mengjian Zhu, Jiayu Dai, Shiqiao Qin, and Kostya S. Novoselov

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c03795

[ASAP] Excitons Enabled Topological Phase Singularity in a Single Atomic Layer
Guoteng Ma, Wanfu Shen, Daniel Soy Sanchez, Yu Yu, Han Wang, Lidong Sun, Xinran Wang, and Chunguang Hu

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c02478

[ASAP] Understanding the Optical Properties of Doped and Undoped 9-Armchair Graphene Nanoribbons in Dispersion
Sebastian Lindenthal, Daniele Fazzi, Nicolas F. Zorn, Abdurrahman Ali El Yumin, Simon Settele, Britta Weidinger, Eva Blasco, and Jana Zaumseil

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c05246

[ASAP] Probing the Inelastic Electron Tunneling via the Photocurrent in a Vertical Graphene van der Waals Heterostructure
Binghe Xie, Zijie Ji, Jiaxin Wu, Ruan Zhang, Yunmin Jin, Kenji Watanabe, Takashi Taniguchi, Zhao Liu, and Xinghan Cai

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c05666

[ASAP] Direct Observation of Locally Modified Excitonic Effects within a Moiré Unit Cell in Twisted Bilayer Graphene
Ming Liu, Ryosuke Senga, Masanori Koshino, Yung-Chang Lin, and Kazu Suenaga

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c06021

[ASAP] Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene
Seyedamin Firouzeh, Sara Illescas-Lopez, Md Anik Hossain, Juan Manuel Cuerva, Luis Álvarez de Cienfuegos, and Sandipan Pramanik

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c06903

[ASAP] On-Surface Synthesis of Graphene Nanoribbons with Atomically Precise Structural Heterogeneities and On-Site Characterizations
Ruoting Yin, Zhengya Wang, Shijing Tan, Chuanxu Ma, and Bing Wang

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c06128

[ASAP] Chemical Amplification-Enabled Topological Modification of Nucleic Acid Aptamers for Enhanced Cancer-Targeted Theranostics
Hong Chen, Yazhou Li, Zhenzhen Xiao, Jili Li, Ting Li, Zhiqiang Wang, Yanlan Liu, and Weihong Tan

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c01955

[ASAP] Bulk Photovoltaic Effect in Two-Dimensional Distorted MoTe2
Sikandar Aftab, Muhammad Arslan Shehzad, Hafiz Muhammad Salman Ajmal, Fahmid Kabir, Muhammad Zahir Iqbal, and Abdullah A. Al-Kahtani

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c03593

[ASAP] Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles
Dongwook Yang, Han Ku Nam, Truong-Son Dinh Le, Jinwook Yeo, Younggeun Lee, Young-Ryeul Kim, Seung-Woo Kim, Hak-Jong Choi, Hyung Cheoul Shim, Seunghwa Ryu, Soongeun Kwon, and Young-Jin Kim

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ACS Nano
DOI: 10.1021/acsnano.3c04120

[ASAP] Nonlinear Optical Responses of Janus MoSSe/MoS2 Heterobilayers Optimized by Stacking Order and Strain
Nguyen Tuan Hung, Kunyan Zhang, Vuong Van Thanh, Yunfan Guo, Alexander A. Puretzky, David B. Geohegan, Jing Kong, Shengxi Huang, and Riichiro Saito

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ACS Nano
DOI: 10.1021/acsnano.3c04436

[ASAP] Sub-5 nm Contacts and Induced p–n Junction Formation in Individual Atomically Precise Graphene Nanoribbons
Pin-Chiao Huang, Hongye Sun, Mamun Sarker, Christopher M. Caroff, Gregory S. Girolami, Alexander Sinitskii, and Joseph W. Lyding

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ACS Nano
DOI: 10.1021/acsnano.3c02794

[ASAP] Edge Contacts to Atomically Precise Graphene Nanoribbons
Wenhao Huang, Oliver Braun, David I. Indolese, Gabriela Borin Barin, Guido Gandus, Michael Stiefel, Antonis Olziersky, Klaus Müllen, Mathieu Luisier, Daniele Passerone, Pascal Ruffieux, Christian Schönenberger, Kenji Watanabe, Takashi Taniguchi, Roman Fasel, Jian Zhang, Michel Calame, and Mickael L. Perrin

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ACS Nano
DOI: 10.1021/acsnano.3c00782

[ASAP] Ultra-Wideband Mid-Infrared Chalcogenide Suspended Nanorib Waveguide Gas Sensors with Exceptionally High External Confinement Factor beyond Free-Space
Mingquan Pi, Chuantao Zheng, Huan Zhao, Zihang Peng, Gangyun Guan, Jialin Ji, Yijun Huang, Yuting Min, Lei Liang, Fang Song, Xue Bai, Yu Zhang, Yiding Wang, and Frank K. Tittel

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ACS Nano
DOI: 10.1021/acsnano.3c02699

Found 1 papers in nat-comm


Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer
< author missing >

Found 1 papers in comm-phys


Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Geometric magnetism and anomalous enantio-sensitive observables in photoionization of chiral molecules
Olga Smirnova

Communications Physics, Published online: 18 September 2023; doi:10.1038/s42005-023-01358-y

Detecting molecular chirality is both challenging and vital. By linking the concepts of chirality and topology, including the derivation of the Berry phase and Berry curvature in chiral molecules, the authors show that the geometrical magnetism generated by ultrafast electron currents yields an efficient set of enantiosensitive observables.