Found 49 papers in cond-mat
Date of feed: Tue, 12 Sep 2023 00:30:00 GMT

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A versatile laser-based apparatus for time-resolved ARPES with micro-scale spatial resolution. (arXiv:2309.04524v1 [cond-mat.mtrl-sci])
Sydney K. Y. Dufresne, Sergey Zhdanovich, Matteo Michiardi, Bradley G. Guislain, Marta Zonno, Sean Kung, Giorgio Levy, Arthur K. Mills, Fabio Boschini, David J. Jones, Andrea Damascelli

We present the development of a versatile apparatus for a 6.2 eV laser-based time and angle-resolved photoemission spectroscopy with micrometer spatial resolution (time-resolved $\mu$-ARPES). With a combination of tunable spatial resolution down to $\sim$11 $\mu$m, high energy resolution ($\sim$11 meV), near-transform-limited temporal resolution ($\sim$280 fs), and tunable 1.55 eV pump fluence up to $\sim$3 mJ/cm$^2$, this time-resolved $\mu$-ARPES system enables the measurement of ultrafast electron dynamics in exfoliated and inhomogeneous materials. We demonstrate the performance of our system by correlating the spectral broadening of the topological surface state of Bi$_2$Se$_3$ with the spatial dimension of the probe pulse, as well as resolving the spatial inhomogeneity contribution to the observed spectral broadening. Finally, after in-situ exfoliation, we performed time-resolved $\mu$-ARPES on a $\sim$30 $\mu$m few-layer-thick flake of transition metal dichalcogenide WTe$_2$, thus demonstrating the ability to access ultrafast electron dynamics with momentum resolution on micro-exfoliated and twisted materials.

Deformed Fredkin model for the $\nu{=}5/2$ Moore-Read state on thin cylinders. (arXiv:2309.04527v1 [cond-mat.str-el])
Cristian Voinea, Songyang Pu, Ammar Kirmani, Pouyan Ghaemi, Armin Rahmani, Zlatko Papić

We propose a frustration-free model for the Moore-Read quantum Hall state on sufficiently thin cylinders with circumferences $\lesssim 7$ magnetic lengths. While the Moore-Read Hamiltonian involves complicated long-range interactions between triplets of electrons in a Landau level, our effective model is a simpler one-dimensional chain of qubits with deformed Fredkin gates. We show that the ground state of the Fredkin model has high overlap with the Moore-Read wave function and accurately reproduces the latter's entanglement properties. Moreover, we demonstrate that the model captures the dynamical response of the Moore-Read state to a geometric quench, induced by suddenly changing the anisotropy of the system. We elucidate the underlying mechanism of the quench dynamics and show that it coincides with the linearized bimetric field theory. The minimal model introduced here can be directly implemented as a first step towards quantum simulation of the Moore-Read state, as we demonstrate by deriving an efficient circuit approximation to the ground state and implementing it on IBM quantum processor.

Flatband slows down polariton dynamics in strongly coupled cavities. (arXiv:2309.04544v1 [cond-mat.mes-hall])
Yesenia A García Jomaso, Brenda Vargas, David Ley Domínguez, Román Armenta, Huziel E. Sauceda, César L Ordoñez-Romero, Hugo A Lara-García, Arturo Camacho-Guardian, Giuseppe Pirruccio

Flatbands in condensed-matter, atomic physics, and quantum optics stand as the basis for several strongly correlated quantum many-body phenomena such as Wigner crystallization, the fractional quantum Hall effect and Moir\'e-related physics. Besides inspiring analogies among diverse physical fields, flatbands are highly sought-after in photonics because they allow unconventional light flows such as slow-light. Here, we realize room-temperature slow-light with Frenkel polaritons excited across two strongly coupled cavities. We demonstrate the formation of a tuneable flatband appearing in absence of a periodic in-plane potential. Our simple photonic architecture enables the unique spatial segregation of photons and excitons in different cavities and maintains a balanced degree of mixing between them. This unveils a dynamical competition between many-body scattering processes and the underlying polariton nature which leads to an increased fluorescence lifetime. The polariton features are further revealed under appropriate resonant pumping, where we observe suppression of the flatband polariton fluorescence intensity.

Erbium-doped WS$_2$ with Down- and Up-Conversion Photoluminescence Integrated on Silicon for Heterojunction Infrared Photodetection. (arXiv:2309.04574v1 [])
Qiuguo Li (1), Hao Rao (2), Haijuan Mei (1), Zhengting Zhao (1), Weiping Gong (1), Andrea Camposeo (3), Dario Pisignano (3,4), Xianguang Yang (2) ((1) Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, (2) Institute of Nanophotonics, Jinan University, (3) NEST, Istituto Nanoscienze-CNR, (4) Dipartimento di Fisica-Università di Pisa)

The integration of 2D nanomaterials with silicon is expected to enrich the applications of 2D functional nanomaterials and to pave the way for next-generation, nanoscale optoelectronics with enhanced performances. Herein, a strategy for rare earth element doping has been utilized for the synthesis of 2D WS$_2$:Er nanosheets to achieve up-conversion and down-conversion emission ranging from visible to the near-infrared region. Moreover, the potential integration of the synthesized 2D nanosheets in silicon platforms is demonstrated by the realization of an infrared photodetector based on a WS$_2$:Er/Si heterojunction. These devices operate at room temperature and show a high photoresponsivity of ~39.8 mA/W (at 980 nm) and a detectivity of 2.79 $\times$ 10$^{10}$ cm Hz$^{1/2}$ W$^{-1}$. Moreover, the dark current and noise power density are suppressed effectively by van der Waals assisted p-n heterojunction. This work fundamentally contributes to establishing infrared detection by rare element doping of 2D materials in heterojunctions with Si, at the forefront of infrared 2D materials-based photonics.

New type of Bernstein modes in two-dimensional electron liquid. (arXiv:2309.04582v1 [cond-mat.mes-hall])
A. N. Afanasiev, P. S. Alekseev, A. A. Greshnov, M. A. Semina

Bernstein modes are formed as a result of non-local coupling of collective excitations and cyclotron harmonics in magnetized plasma. In degenerate solid state plasma they are typically associated with magnetoplasmons. A new type of Bernstein modes arises in two-dimensional electron liquid at sufficiently strong quasiparticle interaction. We consider Bernstein modes originating from coupling between quasiparticle cyclotron harmonics and shear magnetosound waves. The latter may be responsible for the giant peak in radio-frequency photoresistance observed in high-quality GaAs quantum wells. Using Landau-Silin kinetic equation with an arbitrary strength of the interparticle Landau interaction, we trace the reconstruction of Bernstein mode spectrum in high-quality 2D electron systems across the crossover between weakly interacting degenerate electron gas and the correlated electron liquid. Sensitivity of Bernstein modes to the strength of quasiparticle interaction allows one to use them for spectroscopy of Landau interaction function in the electron Fermi liquids.

Electrical Control of Two-Dimensional Electron-Hole Fluids in the Quantum Hall Regime. (arXiv:2309.04600v1 [cond-mat.mes-hall])
Bo Zou, Yongxin Zeng, A.H. MacDonald, Artem Strashko

We study the influence of quantizing perpendicular magnetic fields on the ground state of a bilayer with electron and hole fluids separated by an opaque tunnel barrier. In the absence of a field, the ground state at low carrier densities is a condensate of s-wave excitons that has spontaneous interlayer phase coherence. We find that a series of phase transitions emerge at strong perpendicular fields between condensed states and incompressible incoherent states with full electron and hole Landau levels. When the electron and hole densities are unequal, condensation can occur in higher angular momentum electron-hole pair states and, at weak fields, break rotational symmetry. We explain how this physics is expressed in dual-gate phase diagrams, and predict transport and capacitively-probed thermodynamic signatures that distinguish different states.

Limits of economy and fidelity for programmable assembly of size-controlled triply-periodic polyhedra. (arXiv:2309.04632v1 [cond-mat.soft])
Carlos M. Duque, Douglas M. Hall, Botond Tyukodi, Michael F. Hagan, Christian D. Santangelo, Gregory M. Grason

We propose and investigate an extension of the Caspar-Klug symmetry principles for viral capsid assembly to the programmable assembly of size-controlled triply-periodic polyhedra, discrete variants of the Primitive, Diamond, and Gyroid cubic minimal surfaces. Inspired by a recent class of programmable DNA origami colloids, we demonstrate that the economy of design in these crystalline assemblies -- in terms of the growth of the number of distinct particle species required with the increased size-scale (e.g. periodicity) -- is comparable to viral shells. We further test the role of geometric specificity in these assemblies via dynamical assembly simulations, which show that conditions for simultaneously efficient and high-fidelity assembly require an intermediate degree of flexibility of local angles and lengths in programmed assembly. Off-target misassembly occurs via incorporation of a variant of disclination defects, generalized to the case of hyperbolic crystals. The possibility of these topological defects is a direct consequence of the very same symmetry principles that underlie the economical design, exposing a basic tradeoff between design economy and fidelity of programmable, size controlled assembly.

Discovery of Charge Order in the Transition Metal Dichalcogenide Fe$_{x}$NbS$_2$. (arXiv:2309.04648v1 [cond-mat.str-el])
Shan Wu, Rourav Basak, Wenxin Li, Jong-Woo Kim, Philip J. Ryan, Donghui Lu, Makoto Hashimoto, Christie Nelson, Raul Acevedo-Esteves, Shannon C. Haley, James G. Analytis, Yu He, Alex Frano, Robert J. Birgeneau

The Fe intercalated transition metal dichalcogenide (TMD), Fe$_{1/3}$NbS$_2$, exhibits remarkable resistance switching properties and highly tunable spin ordering phases due to magnetic defects. We conduct synchrotron X-ray scattering measurements on both under-intercalated ($x$ = 0.32) and over-intercalated ($x$ = 0.35) samples. We discover a new charge order phase in the over-intercalated sample, where the excess Fe atoms lead to a zigzag antiferromagnetic order. The agreement between the charge and magnetic ordering temperatures, as well as their intensity relationship, suggests a strong magnetoelastic coupling as the mechanism for the charge ordering. Our results reveal the first example of a charge order phase among the intercalated TMD family and demonstrate the ability to stabilize charge modulation by introducing electronic correlations, where the charge order is absent in bulk 2H-NbS$_2$ compared to other pristine TMDs.

Witnessing Environment Induced Topological Phase Transitions via Quantum Monte Carlo and Cluster Perturbation Theory Studies. (arXiv:2309.04719v1 [cond-mat.str-el])
F. Pavan, A. de Candia, G. Di Bello, V. Cataudella, N. Nagaosa, C. A. Perroni, G. De Filippis

Many-body interactions play a crucial role in quantum topological systems, being able to impact or alter the topological classifications of non-interacting fermion systems. In open quantum systems, where interactions with the environment cause dissipation and decoherence of the fermionic dynamics, the absence of hermiticity in the subsystem Hamiltonian drastically reduces the stability of the topological phases of the corresponding closed systems. Here we investigate the non-perturbative effects induced by the environment on the prototype Su-Schrieffer-Heeger chain coupled to local harmonic oscillator baths through either intra-cell or inter-cell transfer integrals. Despite the common view, this type of coupling, if suitably engineered, can even induce a transition to topological phases. By using a world-line Quantum Monte Carlo technique we determine the phase diagram of the model proving that the bimodality of the probability distribution of the polarization signals the emergence of the topological phase. We show that a qualitative description can be obtained in terms of an approach based on the Cluster Perturbation Theory providing, in particular, a non-Hermitian Hamiltonian for the fermionic subsystem and insights on the dissipative dynamics.

$g$-factor engineering with InAsSb alloys toward zero band gap limit. (arXiv:2309.04779v1 [cond-mat.mtrl-sci])
Yuxuan Jiang, Maksim Ermolaev, Seongphill Moon, Gela Kipshidze, Gregory Belenky, Stefan Svensson, Mykhaylo Ozerov, Dmitry Smirnov, Zhigang Jiang, Sergey Suchalkin

Band gap is known as an effective parameter for tuning the Lande $g$-factor in semiconductors and can be manipulated in a wide range through the bowing effect in ternary alloys. In this work, using the recently developed virtual substrate technique, high-quality InAsSb alloys throughout the whole Sb composition range are fabricated and a large $g$-factor of $g\approx -90$ at the minimum band gap of $\sim 0.1$ eV, which is almost twice that in bulk InSb is found. Further analysis to the zero gap limit reveals a possible gigantic $g$-factor of $g\approx -200$ with a peculiar relativistic Zeeman effect that disperses as the square root of magnetic field. Such a $g$-factor enhancement toward the narrow gap limit cannot be quantitatively described by the conventional Roth formula, as the orbital interaction effect between the nearly triply degenerated bands becomes the dominant source for the Zeeman splitting. These results may provide new insights into realizing large $g$-factors and spin polarized states in semiconductors and topological materials.

Graph Vertex Model. (arXiv:2309.04818v1 [cond-mat.soft])
Tanmoy Sarkar, Matej Krajnc

Cell rearrangements are fundamental mechanisms driving large-scale deformations of living tissues. In three-dimensional (3D) space-filling cell aggregates, cells rearrange through local topological transitions of the network of cell-cell interfaces, which is most conveniently described by the vertex model. Surprisingly, these transitions are not yet mathematically properly formulated due to a rather convoluted architecture of the conventional vertex model. As a result, the vertex model is generally difficult to implement, especially in its full 3D representation. Indeed, the few existing implementations of the full 3D vertex model rely on highly customized and complex software-engineering solutions, which cannot be transparently delineated and are thus mostly non-reproducible. We propose a solution to this outstanding problem by introducing a new formulation of the vertex model, called Graph Vertex Model~(GVM). GVM is based on storing the topology of the cell network into a knowledge graph. Its data structure, uniquely defined by a metagraph, allows performing cell rearrangement events by simple graph transformations, which are themselves represented by graphs. These graph transformations are mathematically well formulated and consist of elementary operations, such as deletions and creations of links between nodes of the knowledge graph, which are straight-forward to implement. Significantly, in the GVM's data representation, complex topological changes in 3D space-filling polyhedral packings can be broken down into a composition of more fundamental T1 transitions. Remarkably, when applied to a 2D system, these transformations reduce to a single T1 transition. This finding unifies topological transitions in 2D and 3D space-filling packings and suggests that the GVM's graph data structure may be the most natural representation of these systems.

High-throughput first-principles calculations screening the coherent topologically close-packed precipitates in hexagonal close-packed metallic systems. (arXiv:2309.04822v1 [cond-mat.mtrl-sci])
Junyuan Bai, Xueyong Pang, Gaowu Qin

Coherent topologically close-packed (TCP) precipitate plates in magnesium alloys are found beneficial to the strength and creep resistance of alloys. To comprehensively screen these TCP plates in the three most common hcp alloys, magnesium (Mg), titanium (Ti), and zirconium (Zr) alloys, we performed high-throughput first-principles calculations under a three-step screening strategy. Our results indicate that the hcp-to-TCP structural transformations (that is, the formation of coherent TCP plates) are prone to occur in Mg alloys, while hcp-Ti and Zr alloys tend to favor hcp-to-bcc structural transformations rather than the formation of TCP plates. Furthermore, these screened results are basically consistent with experimental observations, supporting the reliability of these results. The insights gained contribute to a deeper understanding of precipitation behavior in various hcp-based alloys at the atomic level and serve as a basis for screening coherent precipitates of technological importance in other metallic systems.

Observation of flat and weakly dispersing bands in a van der Waals semiconductor Nb3Br8 with breathing kagome lattice. (arXiv:2309.04865v1 [cond-mat.mes-hall])
Sabin Regmi, Anup Pradhan Sakhya, Tharindu Fernando, Yuzhou Zhao, Dylan Jeff, Milo Sprague, Favian Gonzalez, Iftakhar Bin Elius, Mazharul Islam Mondal, Nathan Valadez, Damani Jarrett, Alexis Agosto, Jihui Yang, Jiun-Haw Chu, Saiful I. Khondaker, Xiaodong Xu, Ting Cao, Madhab Neupane

Niobium halides, Nb3X8 (X = Cl,Br,I), which are predicted two-dimensional magnets, have recently gotten attention due to their breathing kagome geometry. Here, we have studied the electronic structure of Nb3Br8 by using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. ARPES results depict the presence of multiple flat and weakly dispersing bands. These bands are well explained by the theoretical calculations, which show they have Nb d character indicating their origination from the Nb atoms forming the breathing kagome plane. This van der Waals material can be easily thinned down via mechanical exfoliation to the ultrathin limit and such ultrathin samples are stable as depicted from the time-dependent Raman spectroscopy measurements at room temperature. These results demonstrate that Nb3Br8 is an excellent material not only for studying breathing kagome induced flat band physics and its connection with magnetism, but also for heterostructure fabrication for application purposes.

Experimental topological quantum computing with electric circuits. (arXiv:2309.04896v1 [cond-mat.mes-hall])
Deyuan Zou, Naiqiao Pan, Tian Chen, Houjun Sun, Xiangdong Zhang

The key obstacle to the realization of a scalable quantum computer is overcoming environmental and control errors. Topological quantum computation has attracted great attention because it has emerged as one of the most promising approaches to solving these problems. Various theoretical schemes for building topological quantum computation have been proposed. However, experimental implementation has always been a great challenge because it has proved to be extremely difficult to create and manipulate topological qubits in real systems. Therefore, topological quantum computation has not been realized in experiments yet. Here, we report the first experimental realization of topological quantum computation with electric circuits. Based on our proposed new scheme with circuits, Majorana-like edge states are not only observed experimentally, but also T junctions are constructed for the braiding process. Furthermore, we demonstrate the feasibility of topological quantum computing through a set of one- and two-qubit unitary operations. Finally, our implementation of Grover's search algorithm demonstrates that topological quantum computation is ideally suited for such tasks.

Deterministic and non-volatile switching of all-van der Waals spin-orbit torque system above room temperature without external magnetic fields. (arXiv:2309.04930v1 [])
Shivam N. Kajale, Thanh Nyugen, Mingda Li, Deblina Sarkar

Two-dimensional van der Waals (vdW) magnetic materials hold promise for the development of high-density, energy-efficient spintronic devices for memory and computation. Recent breakthroughs in material discoveries and spin-orbit torque (SOT) control of vdW ferromagnets have opened a path for integration of vdW magnets in commercial spintronic devices. However, a solution for field-free electric control of perpendicular magnetic anisotropy (PMA) vdW magnets at room temperatures, essential for building compact and thermally stable spintronic devices, is still missing. Here, we report the first demonstration of field-free deterministic and non-volatile switching of a PMA vdW ferromagnet, Fe$_3$GaTe$_2$ above room temperature (up to 320 K). We use the unconventional out-of-plane anti-damping torque from an adjacent WTe$_2$ layer to enable such switching with a low current density of $2.23 \times 10^6$ A/cm$^2$. This study exemplifies the efficacy of low-symmetry vdW materials for spin-orbit torque control of vdW ferromagnets and provides an all-vdW solution for the next generation of scalable and energy-efficient spintronic devices.

Transport Anisotropy in One-dimensional Graphene Superlattice in the High Kronig-Penney Potential Limit. (arXiv:2309.04931v1 [cond-mat.mes-hall])
Tianlin Li, Hanying Chen, Kun Wang, Yifei Hao, Le Zhang, Kenji Watanabe, Takashi Taniguchi, Xia Hong

One-dimensional graphene superlattice subjected to strong Kronig-Penney (KP) potential is promising for achieving electron lensing effect, while previous studies utilizing the modulated dielectric gates can only yield a moderate, spatially dispersed potential profile. Here, we realize high KP potential modulation of graphene via nanoscale ferroelectric domain gating. Graphene transistors are fabricated on PbZr$_{0.2}$Ti$_{0.8}$O$_{3}$ back-gates patterned with periodic, 100-200 nm wide stripe domains. Due to band reconstruction, the h-BN top-gating induces satellite Dirac points in samples with current along the superlattice vector $\hat{s}$, a feature absent in samples with current perpendicular to $\hat{s}$. The satellite Dirac point position scales with the superlattice period ($L$) as $\propto L^{\beta}$, with $\beta = -1.18 \pm 0.06$. These results can be well explained by the high KP potential scenario, with the Fermi velocity perpendicular to $\hat{s}$ quenched to about 1% of that for pristine graphene. Our study presents a promising material platform for realizing electron supercollimation and investigating flat band phenomena.

Power laws of natural swarms are fingerprints of an extended critical region. (arXiv:2309.05064v1 [cond-mat.stat-mech])
R. González-Albaladejo, L. L. Bonilla

Collective biological systems display power laws for macroscopic quantities and are fertile probing grounds for statistical physics. Besides power laws, natural insect swarms present strong scale-free correlations, suggesting closeness to phase transitions. Swarms exhibit $imperfect$ dynamic scaling: their dynamical correlation functions collapse into single curves when written as functions of the scaled time $t\xi^{-z}$ ($\xi$: correlation length, $z$: dynamic exponent), but only for short times. Triggered by markers, natural swarms are not invariant under space translations. Measured static and dynamic critical exponents differ from those of equilibrium and many nonequilibrium phase transitions. Here, we show that the recently discovered scale-free-chaos phase transition of the harmonically confined Vicsek model has a novel extended critical region for finitely many insects. Unlike results of other theoretical approaches, our numerical simulations of the critical region reproduce the previously described features of natural swarms and yield static and dynamic critical exponents that agree with observations.

Insights into the Energy Transfers in Hydrodynamic Turbulence Using Field-theoretic Tools. (arXiv:2309.05207v1 [physics.flu-dyn])
Mahendra K. Verma

Turbulent flows exhibit intriguing energy transfers. In this paper, we compute the renormalized viscosities, mode-to-mode energy transfers, energy fluxes, and shell-to-shell energy transfers for the two-dimensional (2D) and three-dimensional (3D) hydrodynamic turbulence (HDT) using field-theoretic methods. We employ Craya-Herring basis that provides separate renormalized viscosities and energy transfers for its two components. In addition, Craya-Herring basis eliminates complex tensor algebra and simplifies the calculations considerably. In the $k^{-5/3}$ spectral regime of 2D HDT, the energy transfers between neighbouring (local) wavenumbers are forward, but they are backwards for distant (nonlocal) wavenumbers. The individual transfers between the distant wavenumber shells are small, but their cumulative sum is significant and it overcomes the forward local transfer to yield a constant inverse energy cascade.

For 3D HDT, the mode-to-mode and shell-to-shell energy transfers reveal forward energy transfers for both local and nonlocal wavenumbers. More importantly, using scale-by-scale energy transfers we show that the cumulative nonlocal and local energy transfers are of the same order, which is contrary to the assumption of local energy transfers in turbulence. For 3D HDT, the renormalized viscosity, $\nu_2(k)$, computed by us and other authors are in general agreement, and it varies as $k^{-4/3}$. For 2D HDT, our the renormalized viscosity, $\nu_1(k)>0$, but $\nu_1(k)$ reported in literature shows significant variations including a negative $\nu_1(k)$. In this paper, we argue that the inconsistencies in $\nu_1(k)$ indicate inadequacy of renormalization group analysis that takes into account only local interactions and excludes nonlocal ones. In 2D HDT, the opposing nature of local and nonlocal energy transfers amplifies the error in $\nu_1(k)$.

Extended Josephson junction qubit system. (arXiv:2309.05212v1 [quant-ph])
Andrey Grankin, Alicia J. Kollár, Mohammad Hafezi

Circuit quantum electrodynamics (QED) has emerged as a promising platform for implementing quantum computation and simulation. Typically, junctions in these systems are of a sufficiently small size, such that only the lowest plasma oscillation is relevant. The interplay between the Josephson effect and charging energy renders this mode nonlinear, forming the basis of a qubit. In this work, we introduce a novel QED architecture based on extended Josephson Junctions (JJs), which possess a non-negligible spatial extent. We present a comprehensive microscopic analysis and demonstrate that each extended junction can host multiple nonlinear plasmon modes, effectively functioning as a multi-qubit interacting system, in contrast to conventional JJs. Furthermore, the phase modes exhibit distinct spatial profiles, enabling individual addressing through frequency-momentum selective coupling to photons. Our platform has potential applications in quantum computation, specifically in implementing single- and two-qubit gates within a single junction. We also investigate a setup comprising several driven extended junctions interacting via a multimode electromagnetic waveguide. This configuration serves as a powerful platform for simulating the generalized Bose-Hubbard model, as the photon-mediated coupling between junctions can create a lattice in both real and synthetic dimensions. This allows for the exploration of novel quantum phenomena, such as topological phases of interacting many-body systems.

Melting of excitonic insulator phase by an intense terahertz pulse in Ta$_2$NiSe$_5$. (arXiv:2309.05286v1 [cond-mat.str-el])
Naoki Takamura, Tatsuya Miyamoto, Ryohei Ikeda, Tetsushi Kubo, Masaki Yamamoto, Hiroki Sato, Yang Han, Takayuki Ito, Tetsu Sato, Akitoshi Nakano, Hiroshi Sawa, Hiroshi Okamoto

In this study, the optical response to a terahertz pulse was investigated in the transition metal chalcogenide Ta$_2$NiSe$_5$, a candidate excitonic insulator. First, by irradiating a terahertz pulse with a relatively weak electric field (0.3 MV/cm), the spectral changes in reflectivity near the absorption edge due to third-order optical nonlinearity were measured and the absorption peak characteristic of the excitonic phase just below the interband transition was identified. Next, by irradiating a strong terahertz pulse with a strong electric field of 1.65 MV/cm, the absorption of the excitonic phase was found to be reduced, and a Drude-like response appeared in the mid-infrared region. These responses can be interpreted as carrier generation by exciton dissociation induced by the electric field, resulting in the partial melting of the excitonic phase and metallization. The presence of a distinct threshold electric field for carrier generation indicates exciton dissociation via quantum-tunnelling processes. The spectral change due to metallization by the electric field is significantly different from that due to the strong optical excitation across the gap, which can be explained by the different melting mechanisms of the excitonic phase in the two types of excitations.

Janus-graphene: a two-dimensional half-auxetic carbon allotropes with non-chemical Janus configuration. (arXiv:2309.05319v1 [cond-mat.mtrl-sci])
Linfeng Yu, Jianhua Xu, Chen Shen, Hongbin Zhang, Xiong Zheng, Huiming Wang, Zhenzhen Qin, Guangzhao Qin

The asymmetric properties of Janus two-dimensional materials commonly depend on chemical effects, such as different atoms, elements, material types, etc. Herein, based on carbon gene recombination strategy, we identify an intrinsic non-chemical Janus configuration in a novel purely sp$^2$ hybridized carbon monolayer, named as Janus-graphene. With the carbon gene of tetragonal, hexagonal, and octagonal rings, the spontaneous unilateral growth of carbon atoms drives the non-chemical Janus configuration in Janus-graphene, which is totally different from the chemical effect in common Janus materials such as MoSSe. A structure-independent half-auxetic behavior is mapped in Janus-graphene that the structure maintains expansion whether stretched or compressed, which lies in the key role of $p_z$ orbital. The unprecedented half-auxeticity in Janus-graphene extends intrinsic auxeticity into pure sp$^2$ hybrid carbon configurations. With the unique half-auxeticity emerged in the non-chemical Janus configuration, Janus-graphene enriches the functional carbon family as a promising candidate for micro/nanoelectronic device applications.

Chemisorption Induced Formation of Biphenylene Dimer on Surfaces. (arXiv:2309.05341v1 [cond-mat.mtrl-sci])
Zhiwen Zeng, Dezhou Guo, Tao Wang, Qifan Chen, Adam Matěj, Jianmin Huang, Dong Han, Qian Xu, Aidi Zhao, Pavel Jelínek, Dimas G. de Oteyza, Jean-Sabin McEwen, Junfa Zhu

We report an example that demonstrates the clear interdependence between surface-supported reactions and molecular adsorption configurations. Two biphenyl-based molecules with two and four bromine substituents, i.e. 2,2-dibromo-biphenyl (DBBP) and 2,2,6,6-tetrabromo-1,1-biphenyl (TBBP), show completely different reaction pathways on a Ag(111) surface, leading to the selective formation of dibenzo[e,l]pyrene and biphenylene dimer, respectively. By combining low-temperature scanning tunneling microscopy, synchrotron radiation photoemission spectroscopy, and density functional theory calculations, we unravel the underlying reaction mechanism. After debromination, a bi-radical biphenyl can be stabilized by surface Ag adatoms, while a four-radical biphenyl undergoes spontaneous intramolecular annulation due to its extreme instability on Ag(111). Such different chemisorption-induced precursor states between DBBP and TBBP consequently lead to different reaction pathways after further annealing. In addition, using bond-resolving scanning tunneling microscopy and scanning tunneling spectroscopy, we determine the bond length alternation of biphenylene dimer product with atomic precision, which contains four-, six-, and eight-membered rings. The four-membered ring units turn out to be radialene structures.

Topological nonsymmorphic insulator versus Dirac semimetal in KZnBi. (arXiv:2309.05461v1 [cond-mat.mtrl-sci])
Rahul Verma, Bikash Patra, Bahadur Singh

KZnBi was discovered recently as a new three-dimensional (3D) Dirac semimetal with a pair of bulk Dirac fermions in contrast to the $\mathbb{Z}_2$ trivial insulator reported earlier. In order to address this discrepancy, we have performed electronic structure and topological state analysis of KZnBi using the local, semilocal, and hybrid exchange-correlation (XC) functionals within the density functional theory framework. We find that various XC functionals, including the SCAN meta-GGA and hybrid functionals with 25$\%$ Hartree-Fock (HF) exchange, resolve a topological nonsymmorphic insulator state with the glide-mirror protected hourglass surface Dirac fermions. By carefully tuning the modified Becke-Jhonson (mBJ) potential parameters, we recover the correct orbital ordering and Dirac semimetal state of KZnBi. We further show that increasing the default HF exchange in hybrid functionals ($> 40\%$) can also capture the desired Dirac semimetal state with the correct orbital ordering of KZnBi. The calculated energy dispersion and carrier velocities of Dirac states are found to be in excellent agreement with the available experimental results. Our results demonstrate that KZnBi is a unique topological material where large electron correlations are crucial to realize the Dirac semimetal state.

Topological transitions in dissipatively coupled Su-Schrieffer-Heeger models. (arXiv:2309.05479v1 [quant-ph])
Jayakrishnan M. P. Nair, Marlan O. Scully, Girish S. Agarwal

Non-Hermitian topological phenomena have gained much interest among physicists in recent years. In this paper, we expound on the physics of dissipatively coupled Su-Schrieffer-Heeger (SSH) lattices, specifically in systems with bosonic and electrical constituents. In the context of electrical circuits, we demonstrate that a series of resistively coupled LCR circuits mimics the topology of a dissipatively coupled SSH model. In addition, we foreground a scheme to construct dissipatively coupled SSH lattices involving a set of non-interacting bosonic oscillators weakly coupled to engineered reservoirs of modes possessing substantially small lifetimes when compared to other system timescales. Further, by activating the coherent coupling between bosonic oscillators, we elucidate the emergence of non-reciprocal dissipative coupling which can be controlled by the phase of the coherent interaction strength precipitating in phase-dependent topological transitions and skin effect. Our analyses are generic, apropos of a large class of systems involving, for instance, optical and microwave settings, while the circuit implementation represents the most straightforward of them.

Majorana fermion induced power-law scaling in the violation of Wiedemann-Franz law. (arXiv:2309.05492v1 [cond-mat.mes-hall])
Ritesh Das, Colin Benjamin

Violation of the Wiedemann-Franz (WF) law in a 2D topological insulator due to Majorana bound states (MBS) is studied via the Lorenz ratio in the single-particle picture. We study the scaling of the Lorenz ratio in the presence and absence of MBS with inelastic scattering modeled using a B\"uttiker voltage-temperature probe. We compare our results with that seen in a quantum dot junction in the Luttinger liquid picture operating in the topological Kondo regime. We find that the scaling of the Lorenz ratio in our setup corresponds to the scaling in the Luttinger-liquid setup only when both phase and momentum relaxation occur, but not when only phase relaxation occurs. This suggests that the interplay between the presence of Majorana bound states and the type of inelastic scattering process, can have a significant impact on the violation of the Wiedemann-Franz law in 2D topological insulators.

Singularity theory of Weyl-point creation and annihilation. (arXiv:2309.05506v1 [math-ph])
György Frank, Gergő Pintér, András Pályi

Weyl points (WP) are robust spectral degeneracies, which can not be split by small perturbations, as they are protected by their non-zero topological charge. For larger perturbations, WPs can disappear via pairwise annihilation, where two oppositely charged WPs merge, and the resulting neutral degeneracy disappears. The neutral degeneracy is unstable, meaning that it requires the fine-tuning of the perturbation. Fine-tuning of more than one parameter can lead to more exotic WP mergers. In this work, we reveal and analyze a fundamental connection of the WP mergers and singularity theory: phase boundary points of Weyl phase diagrams, i.e., control parameter values where Weyl point mergers happen, can be classified according to singularity classes of maps between manifolds of equal dimension. We demonstrate this connection on a Weyl--Josephson circuit where the merger of 4 WPs draw a swallowtail singularity, and in a random BdG Hamiltonian which reveal a rich pattern of fold lines and cusp points. Our results predict universal geometrical features of Weyl phase diagrams, and generalize naturally to creation and annihilation of Weyl points in electronic (phononic, magnonic, photonic, etc) band-structure models, where Weyl phase transitions can be triggered by control parameters such as mechanical strain.

The Merged Potts-Clock Model: Algebraic and Conventional Multistructured Multicritical Orderings in Two and Three Dimensions. (arXiv:2309.05543v1 [cond-mat.stat-mech])
E. Can Artun, A. Nihat Berker

A spin system is studied, with simultaneous permutation-symmetric Potts and spin-rotation-symmetric clock interactions, in spatial dimensions d=2 and 3. The global phase diagram is calculated from the renormalizaton-group solution with the recently improved (spontaneous first-order detecting) Migdal-Kadanoff approximation or, equivalently, with hierarchical lattices with the inclusion of effective vacancies. Five different ordered phases are found: conventionally ordered ferromagnetic, quadrupolar, antiferromagnetic phases and algebraically ordered antiferromagnetic, antiquadrupolar phases. These five different ordered phases and the disordered phase are mutually bounded by first- and second-order phase transitions, themselves delimited by multicritical points: inverted bicritical, zero-temperature bicritical, tricritical, second-order bifurcation, and zero-temperature highly degenerate multicritical points. One rich phase diagram topology exhibits all of these phenomena.

Topological phase transition and tunable surface states in YBi. (arXiv:2309.05553v1 [cond-mat.mtrl-sci])
Ramesh Kumar, Mukhtiyar Singh

A unique co-existence of extremely large magnetoresistance (XMR) and topological characteristics in non-magnetic rare-earth monopnictides stimulating intensive research on these materials. Yttrium monobismuthide (YBi) has been reported to exhibit XMR up to 105% but its Topological properties still need clarification. Here we use the hybrid density functional theory to probe the structural, electronic and topological properties of YBi in detail. We observe that YBi is topologically trivial semimetal at ambient pressure which is in accordance with reported experimental results. The topological phase transitions i.e., trivial to non-trivial are obtained with volumetric pressure of 6.5 GPa and 3% of epitaxial strain. This topological phase transitions are well within the structural phase transition of YBi (24.5 GPa). The topological non-trivial state is characterized by band inversions among Y-d band and Bi-p band near {\Gamma}- and X-point in the Brillouin zone. This is further verified with the help of surface band structure along (001) plane. The Z2 topological invariants are calculated with the help of product of parities and evolution of Wannier charge centers. The occurrence of non-trivial phase in YBi with a relatively small epitaxial strain, which a thin film geometry can naturally has, might make it an ideal candidate to probe inter-relationship between XMR and non-trivial topology.

Itinerant ferromagnetism in transition metal dichalcogenides moir\'e superlattices. (arXiv:2309.05556v1 [cond-mat.str-el])
Pawel Potasz, Nicolas Morales-Duran, Nai Chao Hu, Allan H. MacDonald

Moir\'e materials are artificial crystals formed at van der Waals heterojunctions that have emerged as a highly tunable platform to realize much of the rich quantum physics of electrons in atomic scale solids, also providing opportunities to discover new quantum phases of matter. Here we use finite-size exact diagonalization methods to explore the physics of single-band itinerant electron ferromagnetism in semiconductor moir\'e materials. We predict where ferromagnetism is likely to occur in triangular-lattice moir\'e systems, and where it is likely to yield the highest Curie temperatures.

Reentrant Ferromagnetic Ordering of the Random-Field Heisenberg Model in d>2 Dimensions: Fourier-Legendre Renormalization-Group Theory. (arXiv:2309.05576v1 [cond-mat.dis-nn])
Alpar Türkoğlu, A. Nihat Berker

The random-magnetic-field classical Heisenberg model is solved in spatial dimensions d>=2 using the recently developed Fourier-Legendre renormalization-group theory for $4\pi$ steradians continuously orientable spins, with renormalization-group flows of 12,500 variables. The random-magnetic-field Heisenberg model is exactly solved in 10 hierarchical models, for d=2,2.26,2.46,2.58,2.63,2.77,2.89,3. For non-zero random fields, ferromagnetic order is seen for d>2. This ordering shows, at d=3, reentrance as a function of temperature.

Atomistic Control in Molecular Beam Epitaxy Growth of Intrinsic Magnetic Topological Insulator MnBi2Te4. (arXiv:2309.05656v1 [cond-mat.mtrl-sci])
Hyunsue Kim, Mengke Liu, Lisa Frammolino, Yanxing Li, Fan Zhang, Woojoo Lee, Chengye Dong, Yi-Fan Zhao, Guan-Yu Chen, Pin-Jui Hsu, Cui-Zu Chang, Joshua Robinson, Jiaqiang Yan, Xiaoqin Li, Allan H. MacDonald, Chih-Kang Shih

Intrinsic magnetic topological insulators have emerged as a promising platform to study the interplay between topological surface states and ferromagnetism. This unique interplay can give rise to a variety of exotic quantum phenomena, including the quantum anomalous Hall effect and axion insulating states. Here, utilizing molecular beam epitaxy (MBE), we present a comprehensive study of the growth of high-quality MnBi2Te4 thin films on Si (111), epitaxial graphene, and highly ordered pyrolytic graphite substrates. By combining a suite of in-situ characterization techniques, we obtain critical insights into the atomic-level control of MnBi2Te4 epitaxial growth. First, we extract the free energy landscape for the epitaxial relationship as a function of the in-plane angular distribution. Then, by employing an optimized layer-by-layer growth, we determine the chemical potential and Dirac point of the thin film at different thicknesses. Overall, these results establish a foundation for understanding the growth dynamics of MnBi2Te4 and pave the way for the future applications of MBE in emerging topological quantum materials.

Massless multifold Hopf semimetals. (arXiv:2203.09966v3 [cond-mat.mes-hall] UPDATED)
Ansgar Graf, Frédéric Piéchon

Three-dimensional topological semimetals exhibit linear energy band crossing points that act as monopoles of Berry curvature. Here, an alternative class of semimetals is introduced, featuring linear $N$-fold crossing points each of which acts as a source of a \emph{Berry dipole}. We construct continuum and lattice models for such \emph{massless multifold Hopf semimetals (MMHSs)} with $N=3,4,5$ bands and study nontrivial effects of a Berry dipole crossing: (i) A Landau level spectrum that is strongly tunable by the orientation of the magnetic field relative to the dipole axis. (ii) An anomalous Hall conductivity that is an odd function of the Fermi level. (iii) Weak-field dissipative magnetoconductivities that resemble the chiral anomaly, chiral magnetic and magnetochiral effects familiar from a pair of coupled Weyl nodes, but that are even functions of the Fermi level. By gapping out MMHSs, multiband Hopf insulators with Hopf numbers as high as $\mathcal{N}_\text{Hopf}=10$ are obtained, providing a fertile playground to explore delicate topology.

Breakdown of quantization in nonlinear Thouless pumping. (arXiv:2205.10978v2 [nlin.PS] UPDATED)
Thomas Tuloup, Raditya Weda Bomantara, Jiangbin Gong

The dynamics of solitons driven in a nonlinear Thouless pump and its connection with the system's topology were recently explored for both weak and strong nonlinear strength. This work uncovers the fate of nonlinear Thouless pumping in the regime of intermediate nonlinearity, thus establishing a fascinating crossover from the observation of nonzero and quantized pumping at weak nonlinearity to zero pumping at strong nonlinearity. We identify the presence of critical nonlinearity strength at which quantized pumping of solitons breaks down regardless of the protocol time scale. Such an obstruction to pumping quantization is attributed to the presence of loop structures of nonlinear topological bands. Our results not only unveil a missing piece of physics in nonlinear Thouless pumping, but also provide a means to detect loop structures of nonlinear systems investigated in real space.

Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force. (arXiv:2206.00791v2 [cond-mat.mtrl-sci] UPDATED)
Takaaki Dohi, Markus Weißenhofer, Nico Kerber, Fabian Kammerbauer, Yuqing Ge, Klaus Raab, Jakub Zàzvorka, Maria-Andromachi Syskaki, Aga Shahee, Moritz Ruhwedel, Tobias Böttcher, Philipp Pirro, Gerhard Jakob, Ulrich Nowak, Mathias Kläui

Magnetic skyrmions, topologically-stabilized spin textures that emerge in magnetic systems, have garnered considerable interest due to a variety of electromagnetic responses that are governed by the topology. The topology that creates a microscopic gyrotropic force also causes detrimental effects, such as the skyrmion Hall effect, which is a well-studied phenomenon highlighting the influence of topology on the deterministic dynamics and drift motion. Furthermore, the gyrotropic force is anticipated to have a substantial impact on stochastic diffusive motion; however, the predicted repercussions have yet to be demonstrated, even qualitatively. Here we demonstrate enhanced thermally-activated diffusive motion of skyrmions in a specifically designed synthetic antiferromagnet. Suppressing the effective gyrotropic force by tuning the angular momentum compensation leads to a more than 10 times enhanced diffusion coefficient compared to that of ferromagnetic skyrmions. Consequently, our findings not only demonstrate the gyro-force dependence of the diffusion coefficient but also enable ultimately energy-efficient unconventional stochastic computing.

Deconfined criticalities and dualities between chiral spin liquid, topological superconductor and charge density wave Chern insulator. (arXiv:2206.08939v3 [cond-mat.str-el] UPDATED)
Xue-Yang Song, Ya-Hui Zhang

We propose bi-critical and tri-critical theories between chiral spin liquid (CSL), topological superconductor (SC) and charge density wave (CDW) ordered Chern insulator with Chern number $C=2$ on square, triangular and kagome lattices. The three CDW order parameters form a manifold of $S^2$ or $S^1$ depending on whether there is easy-plane anisotropy. The skyrmion defect of the CDW order carries physical charge $2e$ and its condensation leads to a topological superconductor. The CDW-SC transitions are in the same universality classes as the celebrated deconfined quantum critical points (DQCP) between Neel order and valence bond solid order on square lattice. Both SC and CDW order can be accessed from the CSL phase through a continuous phase transition. At the CSL-SC transition, there is still CDW order fluctuations although CDW is absent in both sides. We propose three different theories for the CSL-SC transition (and CSL to easy-plane CDW transition): a $U(1)$ theory with two bosons, a $U(1)$ theory with two Dirac fermions, and an $SU(2)$ theory with two bosons. Our construction offers a derivation of the duality between these three theories as well as a promising physical realization. The $SU(2)$ theory offers a unified framework for a series of fixed points with explicit $SO(5), O(4)$ or $SO(3)\times O(2)$ symmetry. There is also a transparent duality transformation mapping SC order to easy-plane CDW order. The CSL-SC-CDW tri-critical points are invariant under this duality mapping and have an enlarged $SO(5)$ or $O(4)$ symmetry. The DQCPs between CDW and SC inherit the enlarged symmetry, emergent anomaly, and self-duality from the tri-critical point. Our analysis unifies the well-studied DQCP between symmetry breaking phases into a larger framework where they are proximate to a topologically ordered phase.

Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$. (arXiv:2209.11528v3 [cond-mat.str-el] UPDATED)
Martin Bluschke, Naman K. Gupta, Hoyoung Jang, Ali A. Husain, Byungjune Lee, MengXing Na, Brandon Dos Remedios, Steef Smit, Peter Moen, Sang-Youn Park, Minseok Kim, Dogeun Jang, Hyeongi Choi, Ronny Sutarto, Alexander H. Reid, Georgi L. Dakovski, Giacomo Coslovich, Quynh L. Nguyen, Nicolas G. Burdet, Ming-Fu Lin, Alexandre Revcolevschi, Jae-Hoon Park, Jochen Geck, Joshua J. Turner, Andrea Damascelli, David G. Hawthorn

Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant x-ray scattering on the (0 0 1) Bragg peak at the Cu $L_3$ and O $K$ resonances, we investigate non-equilibrium dynamics of $Q_a = Q_b = 0$ nematic order and its association with both charge density wave (CDW) order and lattice dynamics in La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$. The orbital selectivity of the resonant x-ray scattering cross-section allows nematicity dynamics associated with the planar O 2$p$ and Cu 3$d$ states to be distinguished from the response of anisotropic lattice distortions. A direct time-domain comparison of CDW translational-symmetry breaking and nematic rotational-symmetry breaking reveals that these broken symmetries remain closely linked in the photoexcited state, consistent with the stability of CDW topological defects in the investigated pump fluence regime.

G-crossed Modularity of Symmetry-Enriched Topological Phases. (arXiv:2210.14943v2 [cond-mat.str-el] UPDATED)
Arman Babakhani, Parsa Bonderson

The universal properties of (2 + 1)D topological phases of matter enriched by a symmetry group G are described by G-crossed extensions of unitary modular tensor categories (UMTCs). While the fusion and braiding properties of quasiparticles associated with the topological order are described by a UMTC, the G-crossed extensions further capture the properties of the symmetry action, fractionalization, and defects arising from the interplay of the symmetry with the topological order. We describe the relation between the G-crossed UMTC and the topological state spaces on general surfaces that may include symmetry defect branch lines and boundaries that carry topological charge. We define operators in terms of the G-crossed UMTC data that represent the mapping class transformations for such states on a torus with one boundary, and show that these operators provide projective representations of the mapping class groups. This allows us to represent the mapping class group on general surfaces and ensures a consistent description of the corresponding symmetry-enriched topological phases on general surfaces. Our analysis also enables us to prove that a faithful G-crossed extension of a UMTC is necessarily G-crossed modular.

Observation of self-patterned defect formation in atomic superfluids -- from ring dark solitons to vortex dipole necklaces. (arXiv:2211.08575v3 [cond-mat.quant-gas] UPDATED)
Hikaru Tamura, Cheng-An Chen, Chen-Lung Hung

Unveiling nonequilibrium dynamics of solitonic and topological defect structures in a multidimensional nonlinear medium is a current frontier across diverse fields. One of the quintessential objects is a ring dark soliton (RDS), whose dynamics are expected to display remarkable interplay between symmetry and self-patterned topological defect formation from a transverse (snake) instability, but it has thus far evaded full experimental observations. Here, we report an experimental realization of RDS generation in a two-dimensional atomic superfluid trapped in a circular box. By quenching the confining box potential, we observe an RDS emitted from the edge and its peculiar signature in the radial motion. As an RDS evolves, we observe transverse modulations at discrete azimuthal angles, which clearly result in a patterned formation of a circular vortex dipole array. Through collisions of the vortex dipoles with the box trap, we observe vortex unbinding, vortex pinning to the edge, and emission of rarefaction pulses. Our box-quench protocol opens a new way to study multidimensional dark solitons, structured formation of topological defects, and potentially the dynamics of ordered quantum vortex matter.

The One-dimensional Chiral Anomaly and its Disorder Response. (arXiv:2302.13556v4 [cond-mat.mes-hall] UPDATED)
Zheng Qin, Dong-Hui Xu, Zhen Ning, Rui Wang

The condensed-matter realization of chiral anomaly has attracted tremendous interest in exploring unexpected phenomena of quantum field theory. Here, we show that one-dimensional (1D) chiral anomaly (i.e., 1D nonconservational chiral current under a background electromagnetic field) can be realized in a generalized Su-Schrieffer-Heeger model where a single gapless Dirac cone occurs. Based on the topological Thouless pump and anomalous dynamics of chiral displacement, we elucidate that such a system possesses the half-integer quantization of winding number. Moreover, we investigate the evolution of 1D chiral anomaly with respect to two typical types of disorder, i.e., on-site disorder and bond disorder. The results show that the on-site disorder tends to smear the gapless Dirac cone. However, we propose a strategy to stabilize the half-integer quantization, facilitating its experimental detection. Furthermore, we demonstrate that the bond disorder causes a unique crossover with disorder-enhanced topological charge pumping, driving the system into a topological Anderson insulator phase.

Higher-order topological superconductors characterized by Fermi-level crossings. (arXiv:2303.07698v3 [cond-mat.mes-hall] UPDATED)
Hong Wang, Xiaoyu Zhu

We demonstrate that level crossings at the Fermi energy serve as robust indicators for higher-order topology in two-dimensional superconductors of symmetry class D. These crossings occur when the boundary condition in one direction is continuously varied from periodic to open, revealing the topological distinction between opposite edges. The associated Majorana numbers acquire nontrivial values whenever the system supports two Majorana zero modes distributed at its corners. Thanks to their immunity to perturbations that break crystalline symmetries, Fermi-level crossings are able to characterize a wide range of higher-order topological superconductors. By directly identifying level-crossing points from bulk Hamiltonian, we establish the correspondence between gapped bulk and Majorana corner states in higher-order phases. In the end, we illustrate this correspondence using two toy models. Our findings suggest that Fermi-level crossings offer a possible avenue for characterizing higher-order topological superconductors in a unifying framework.

Flat-band ferromagnetism in the SU($N$) Hubbard and Kondo lattice models. (arXiv:2303.15820v2 [cond-mat.str-el] UPDATED)
Kensuke Tamura, Hosho Katsura

We develop a general theory of flat-band ferromagnetism in the SU($N$) Fermi-Hubbard model, which describes the behavior of $N$-component fermions with SU($N$) symmetric interactions. We focus on the case where the single-particle spectrum has a flat band and establish a necessary and sufficient condition for the SU($N$) Hubbard model to exhibit ferromagnetism when the number of particles is the same as the degeneracy. We show that the occurrence of ferromagnetism is equivalent to the irreducibility of the projection matrix onto the space of single-particle ground states. We also demonstrate that this result can be exploited to establish a rigorous result for the ferromagnetic SU($N$) Kondo lattice model with a flat band. Specifically, we prove that when the SU($N$) Hubbard model is ferromagnetic, the ferromagnetic SU($N$) Kondo lattice model with the same hopping matrix also exhibits SU($N$) ferromagnetism.

Josephson-like tunnel resonance and large Coulomb drag in GaAs-based electron-hole bilayers. (arXiv:2304.06691v3 [cond-mat.mes-hall] UPDATED)
M. L. Davis (1), S. Parolo (1), C. Reichl (1), W. Dietsche (1,2), W. Wegscheider (1,3) ((1) Solid State Physics Laboratory ETH Zürich, (2) Max-Planck-Institut für Festkörperforschung Stuttgart, (3) Quantum Center ETH Zürich)

Bilayers consisting of two-dimensional (2D) electron and hole gases separated by a 10 nm thick AlGaAs barrier are formed by charge accumulation in epitaxially grown GaAs. Both vertical and lateral electric transport are measured in the millikelvin temperature range. The conductivity between the layers shows a sharp tunnel resonance at a density of $1.1 \cdot 10^{10} \text{ cm}^{-2}$, which is consistent with a Josephson-like enhanced tunnel conductance. The tunnel resonance disappears with increasing densities and the two 2D charge gases start to show 2D-Fermi-gas behavior. Interlayer interactions persist causing a positive drag voltage that is very large at small densities. The transition from the Josephson-like tunnel resonance to the Fermi-gas behavior is interpreted as a phase transition from an exciton gas in the Bose-Einstein-condensate state to a degenerate electron-hole Fermi gas.

Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport. (arXiv:2304.07478v2 [cond-mat.mes-hall] UPDATED)
Alina Mreńca-Kolasińska, Szu-Chao Chen, Ming-Hao Liu

The presence of periodic modulation in graphene leads to a reconstruction of the band structure and formation of minibands. In an external uniform magnetic field, a fractal energy spectrum called Hofstadter butterfly is formed. Particularly interesting in this regard are superlattices with tunable modulation strength, such as electrostatically induced ones in graphene. We perform quantum transport modeling in gate-induced square two-dimensional superlattice in graphene and investigate the relation to the details of the band structure. At low magnetic field the dynamics of carriers reflects the semi-classical orbits which depend on the mini band structure. We theoretically model transverse magnetic focusing, a ballistic transport technique by means of which we investigate the minibands, their extent and carrier type. We find a good agreement between the focusing spectra and the mini band structures obtained from the continuum model, proving usefulness of this technique. %positions of van Hove singularities at high magnetic field the calculated four-probe resistance fit the Hofstadter butterfly spectrum obtained for our superlattice. Our quantum transport modeling provides an insight into the mini band structures, and can be applied to other superlattice geometries.

Engineering phase and density of Bose-Einstein condensates in curved waveguides with toroidal topology. (arXiv:2306.11873v2 [cond-mat.quant-gas] UPDATED)
Yelyzaveta Nikolaieva, Luca Salasnich, Alexander Yakimenko

We investigate the effects of ellipticity-induced curvature on atomic Bose-Einstein condensates confined in quasi-one-dimensional closed-loop waveguides. Our theoretical study reveals intriguing phenomena arising from the interplay between curvature and interactions. Density modulations are observed in regions of high curvature, but these modulations are suppressed by strong repulsive interactions. Additionally, we observe phase accumulation in regions with the lowest curvature when the waveguide with persistent current is squeezed. Furthermore, waveguides hosting persistent currents exhibit dynamic transformations between states with different angular momenta. These findings provide insights into the behavior of atomic condensates in curved waveguides, with implications for fundamental physics and quantum technologies. The interplay between curvature and interactions offers opportunities for exploring novel quantum phenomena and engineering quantum states in confined geometries.

Structural pathway for nucleation and growth of topologically close-packed phase from parent hexagonal crystal. (arXiv:2307.06676v2 [cond-mat.mtrl-sci] UPDATED)
Junyuan Bai, Hongbo Xie, Xueyong Pang, Min Jiang, Gaowu Qin

The solid diffusive phase transformation involving the nucleation and growth of one nucleus is universal and frequently employed but has not yet been fully understood at the atomic level. Here, our first-principles calculations reveal a structural formation pathway of a series of topologically close-packed (TCP) phases within the hexagonally close-packed (hcp) matrix. The results show that the nucleation follows a nonclassical nucleation process, and the whole structural transformation is completely accomplished by the shuffle-based displacements, with a specific 3-layer hcp-ordering as the basic structural transformation unit. The thickening of plate-like TCP phases relies on forming these hcp-orderings at their coherent TCP/matrix interface to nucleate ledge, but the ledge lacks the dislocation characteristics considered in the conventional view. Furthermore, the atomic structure of the critical nucleus for the Mg2Ca and MgZn2 Laves phases was predicted in terms of Classical Nucleation Theory (CNT), and the formation of polytypes and off-stoichiometry in TCP precipitates is found to be related to the nonclassical nucleation behavior. Based on the insights gained, we also employed high-throughput screening to explore several common hcp-metallic (including hcp-Mg, Ti, Zr, and Zn) systems that may undergo hcp-to-TCP phase transformations. These insights can deepen our understanding of solid diffusive transformations at the atomic level, and constitute a foundation for exploring other technologically important solid diffusive transformations.

Electrostatic shielding effect and Binding energy shift of MoS2, MoSe2 and MoTe2 materials. (arXiv:2307.08035v4 [cond-mat.mtrl-sci] UPDATED)
Yaorui Tan, Maolin Bo

In this paper, the electronic structure and bond properties of MoS2, MoSe2 and MoTe2 are studied. Density functional theory (DFT) calculates combined with the binding energy and bond-charge (BBC) model to obtain electronic structure, binding energy shift and bond properties. It is found that electrostatic shielding by electron exchange is the main cause of density fluctuation. A method for calculating the density of Green's function with energy level shift is established. It provides new methods and ideas for the further study of the binding energy, bond states and electronic properties of nanomaterials.

Topological interfacial states in ferroelectric domain walls of two-dimensional bismuth. (arXiv:2308.04633v2 [cond-mat.mtrl-sci] UPDATED)
Wei Luo, Yang Zhong, Hongyu Yu, Muting Xie, Yingwei Chen, Hongjun Xiang, Laurent Bellaiche

Using machine learning method, we investigate various domain walls for the recently discovered single-element ferroelectrics bismuth monolayer [Nature 617, 67 (2023)]. Surprisingly, we find that the charged domain wall configuration has a lower energy than the uncharged domain wall structure due to its low electrostatic repulsion potential. Two stable charged domain wall configurations exhibit topological interfacial states near their domain walls, which is caused by the change of the Z_2 number between ferroelectric and paraelectric states. Interestingly, different from the edge states of topological insulators, the topological interfacial states related Dirac bands are contributed from different edges which is caused by the build-in electric field of FE. Our works thus indicate that domain walls in two-dimensional bismuth can be a good platform for ferroelectric domain wall devices.

Phase transitions out of quantum Hall states in moir\'e TMD bilayers. (arXiv:2308.10903v2 [cond-mat.str-el] UPDATED)
Xue-Yang Song, Ya-Hui Zhang, T. Senthil

Motivated by the recent experimental breakthroughs in observing Fractional Quantum Anomalous Hall (FQAH) states in moir\'e Transition Metal Dichalcogenide (TMD) bilayers, we propose and study various unconventional phase transitions between quantum Hall phases and Fermi liquids or charge ordered phases upon tuning the bandwidth. At filling $\nu=-\frac{2}{3}$, we describe a direct transition between the FQAH state and a Charge Density Wave (CDW) insulator. The critical theory resembles that of the familiar deconfined quantum critical point(DQCP) but with an additional Chern-Simons term. At filling $\nu=-\frac{1}{2}$, we study the possibility of a continuous transition between the composite Fermi liquid (CFL) and the Fermi liquid (FL) building on and refining previous work by Barkeshli and McGreevy. Crucially we show that translation symmetry alone is enough to enable a second order CFL-FL transition. We argue that there must be critical CDW fluctuations though neither phase has long range CDW order. We present experimental signatures the most striking of which is a universal jump of both longitudinal and Hall resistivities at the critical point. With disorder, we argue that the CDW order gets pinned and the CFL-FL evolution happens through an intermediate electrically insulating phase with mobile neutral fermions. A clean analog of this insulating phase with long range CDW order and a neutral fermi surface can potentially also exist. We discuss the properties of this phase and the nature of its phase transitions. We also present a critical theory for the CFL to FL transition at filling $\nu=-\frac{3}{4}$. Our work opens up a new avenue to realize deconfined criticalities and fractionalized phases beyond familiar Landau level physics in the moir\'e Chern band system.

Rapid droplet leads the Liquid-Infused Slippery Surfaces more slippery. (arXiv:2309.02038v2 [physics.flu-dyn] UPDATED)
Kun Li, Cunjing Lv, Xi-Qiao Feng

The introduction of lubricant between fluid and substrate endows the Liquid-Infused Slippery Surfaces with excellent wetting properties: low contact angle, various liquids repellency, ice-phobic and self-healing. Droplets moving on such surfaces have been widely demonstrated to obey a Landau-Levich-Derjaguin (LLD) friction. Here, we show that this power law is surprisingly decreased with the droplet accelerates: in the rapid droplet regime, the slippery surfaces seem more slippery than LLD friction. Combining experimental and numerical techniques, we find that the meniscus surrounding the droplet exhibits an incompletely developed state. The Incompletely Developed Meniscus possesses shorter shear length and thicker shear thickness than the prediction of Bretherton model and therefore is responsible for the more slippery regime. With an extended Bretherton model, we not only provide an analytical description to the IDM behavior but also the friction when the Capillary Number of the moving droplet is larger than the Critical Capillary Number.

Found 11 papers in prb
Date of feed: Tue, 12 Sep 2023 03:17:08 GMT

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Dual-band acoustic higher-order topological metamaterial composed of meta-atoms and meta-molecules
Changlin Ding, Jianbing Shi, Yibao Dong, Yun Bai, Shilong Zhai, and Xiaopeng Zhao
Author(s): Changlin Ding, Jianbing Shi, Yibao Dong, Yun Bai, Shilong Zhai, and Xiaopeng Zhao

We present a dual-band topological transport of edge states and corner states in a composite acoustic higher-order topological metamaterial (AHOTM) composed of meta-atoms of hollow tubes (HTs) and meta-molecules of opened-hole hollow tubes (OHTs) arrayed as a regular triangle in a hexagonal lattice …

[Phys. Rev. B 108, 094103] Published Mon Sep 11, 2023

Phase transition and evidence of fast-scrambling phase in measurement-only quantum circuits
Yoshihito Kuno, Takahiro Orito, and Ikuo Ichinose
Author(s): Yoshihito Kuno, Takahiro Orito, and Ikuo Ichinose

Information scrambling is nowadays one of the most important topics in various fields of research. Measurement-only circuits (MoCs) exhibit specific information scrambling dynamics, depending on the types of projective measurements and their mutual anticommutativity. The spatial range of the project…

[Phys. Rev. B 108, 094104] Published Mon Sep 11, 2023

Renormalization view on resonance proliferation between many-body localized phases
Jared Jeyaretnam, Christopher J. Turner, and Arijeet Pal
Author(s): Jared Jeyaretnam, Christopher J. Turner, and Arijeet Pal

Topology and many-body localization (MBL) have opened new avenues for preserving quantum information at finite energy density. Resonant delocalization plays a crucial role in destabilizing these phenomena. In this paper, we study the statistical properties of many-body resonances in a disordered int…

[Phys. Rev. B 108, 094205] Published Mon Sep 11, 2023

Measuring Dirac cones in a brick-wall lattice microwave metamaterial
Bing Li, Simon Yves, Alexandre Delory, Shiqi Liu, Mathias Fink, and Fabrice Lemoult
Author(s): Bing Li, Simon Yves, Alexandre Delory, Shiqi Liu, Mathias Fink, and Fabrice Lemoult

The intriguing discovery of bidimensional structures in solid-state physics has motivated the seeking of their analogs in many fields. In this paper, we propose a general scheme to achieve Dirac cones in the microwave domain. It is based on a bidimensional locally resonant metamaterial ruled by a ti…

[Phys. Rev. B 108, 094301] Published Mon Sep 11, 2023

Chern insulating state with double-$Q$ ordering wave vectors at the Brillouin zone boundary
Satoru Hayami
Author(s): Satoru Hayami

Magnetic multiple-$Q$ states consisting of multiple spin density waves are a source of unconventional topological spin textures, such as skyrmion and hedgehog. We theoretically investigate a topologically nontrivial double-$Q$ state with a net spin scalar chirality on a two-dimensional square lattic…

[Phys. Rev. B 108, 094416] Published Mon Sep 11, 2023

Unified role of Green's function poles and zeros in correlated topological insulators
Andrea Blason and Michele Fabrizio
Author(s): Andrea Blason and Michele Fabrizio

Green's function zeros, which can emerge only if correlation is strong, have been for long overlooked and believed to be devoid of any physical meaning, unlike Green's function poles. Here, we prove that Green's function zeros instead contribute on the same footing as poles to determine the topologi…

[Phys. Rev. B 108, 125115] Published Mon Sep 11, 2023

Entanglement and particle fluctuations of one-dimensional chiral topological insulators
Kyle Monkman and Jesko Sirker
Author(s): Kyle Monkman and Jesko Sirker

We consider the topological protection of entanglement and particle fluctuations for a general one-dimensional chiral topological insulator with winding number $\mathcal{I}$. We prove, in particular, that when the periodic system is divided spatially into two equal halves, the single-particle entang…

[Phys. Rev. B 108, 125116] Published Mon Sep 11, 2023

First-principles investigation of thickness-dependent electrical resistivity for low-dimensional interconnects
Benoit Van Troeye, Kiroubanand Sankaran, Zsolt Tokei, Christoph Adelmann, and Geoffrey Pourtois
Author(s): Benoit Van Troeye, Kiroubanand Sankaran, Zsolt Tokei, Christoph Adelmann, and Geoffrey Pourtois

The relentless miniaturization of transistors drives the search for alternative metals to copper for low-dimension interconnects. Indeed, some elementary metals, like ruthenium, become less resistive than copper at low dimensions, leading to smaller losses in the connection lines. For most parts, su…

[Phys. Rev. B 108, 125117] Published Mon Sep 11, 2023

Time-reversal invariant finite-size topology
R. Flores-Calderon, Roderich Moessner, and Ashley M. Cook
Author(s): R. Flores-Calderon, Roderich Moessner, and Ashley M. Cook

We report finite-size topology in the quintessential time-reversal (TR) invariant systems, the quantum spin Hall insulator (QSHI) and the three-dimensional, strong topological insulator (STI)—previously-identified helical or Dirac cone boundary states of these phases hybridize in wire or slab geomet…

[Phys. Rev. B 108, 125410] Published Mon Sep 11, 2023

Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene
Paul Henderson, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, and Maksym Serbyn
Author(s): Paul Henderson, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, and Maksym Serbyn

Harnessing the power of deep learning, researchers have developed a novel method to fit the band structure parameters of complex 2D materials, such as trilayer graphene. By training neural networks on simulated data for the density of states, and then minimizing the effective distance between network-generated images and experimental data, the authors obtain here accurate predictions of tight-binding parameters, validating their results against literature values. This method can be easily extended to other complex two-dimensional materials, as well as to other experimental techniques.

[Phys. Rev. B 108, 125411] Published Mon Sep 11, 2023

Quantum valley and subvalley Hall effect in large-angle twisted bilayer graphene
Chiranjit Mondal, Rasoul Ghadimi, and Bohm-Jung Yang
Author(s): Chiranjit Mondal, Rasoul Ghadimi, and Bohm-Jung Yang

We study the quantum valley Hall effect and related domain wall modes in twisted bilayer graphene at a large commensurate angle. Due to the quantum valley and subvalley Hall effect, a small deviation from the commensurate angle generates two-dimensional conducting network patterns composed of one-di…

[Phys. Rev. B 108, L121405] Published Mon Sep 11, 2023

Found 5 papers in prl
Date of feed: Tue, 12 Sep 2023 03:17:07 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)

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

Found 2 papers in pr_res
Date of feed: Tue, 12 Sep 2023 03:17:08 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)

Full counting statistics of Yu-Shiba-Rusinov bound states
David Christian Ohnmacht, Wolfgang Belzig, and Juan Carlos Cuevas
Author(s): David Christian Ohnmacht, Wolfgang Belzig, and Juan Carlos Cuevas

With the help of scanning tunneling microscopy (STM) it has become possible to address single magnetic impurities on superconducting surfaces and to investigate the peculiar properties of the in-gap states known as Yu-Shiba-Rusinov (YSR) states. These systems are an ideal playground to investigate m…

[Phys. Rev. Research 5, 033176] Published Mon Sep 11, 2023

Intrinsic nonmagnetic ${ϕ}_{0}$ Josephson junctions in twisted bilayer graphene
M. Alvarado, P. Burset, and A. Levy Yeyati
Author(s): M. Alvarado, P. Burset, and A. Levy Yeyati

Chiral pairing in magic-angle twisted bilayer graphene is shown to manifest in the appearance of an anomalous Josephson effect (ϕ0 behavior) without requiring any magnetic materials or fields. Such behavior arises from the combination of chiral pairing and nontrivial topology, which can effectively break inversion symmetry.

[Phys. Rev. Research 5, L032033] Published Mon Sep 11, 2023

Found 1 papers in nano-lett
Date of feed: Mon, 11 Sep 2023 13:07:02 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] Toroidal Dipole BIC-Driven Highly Robust Perfect Absorption with a Graphene-Loaded Metasurface
Rong Jin, Lujun Huang, Chaobiao Zhou, Jiaoyang Guo, Zhenchu Fu, Jian Chen, Jian Wang, Xin Li, Feilong Yu, Jin Chen, Zengyue Zhao, Xiaoshuang Chen, Wei Lu, and Guanhai Li

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02958

Found 1 papers in sci-rep

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)

Author Correction: Exploring room temperature spin transport under band gap opening in bilayer graphene
Ivan J. Vera-Marun

Scientific Reports, Published online: 11 September 2023; doi:10.1038/s41598-023-42109-x

Author Correction: Exploring room temperature spin transport under band gap opening in bilayer graphene