Found 51 papers in cond-mat
Date of feed: Tue, 09 Jan 2024 01:30:00 GMT

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Stable nodal line semimetals in the chiral classes in three dimensions. (arXiv:2401.02966v1 [cond-mat.mes-hall])
Faruk Abdulla, Ganpathy Murthy, Ankur Das

It has been realized over the past two decades that topological nontriviality can be present not only in insulators but also in gapless semimetals, the most prominent example being Weyl semimetals in three dimensions. Key to topological classification schemes are the three ``internal" symmetries, time reversal ${\cal T}$, charge conjugation ${\cal C}$, and their product, called chiral symmetry ${\cal S}={\cal T}{\cal C}$. In this work, we show that robust topological nodal line semimetal phases occur in $d=3$ in systems whose internal symmetries include ${\cal S}$, without invoking crystalline symmetries other than translations. Since the nodal loop semimetal naturally appears as an intermediate gapless phase between the topological and the trivial insulators, a sufficient condition for the nodal loop phase to exist is that the symmetry class must have a nontrivial topological insulator in $d=3$. Our classification uses the winding number on a loop that links the nodal line. A nonzero winding number on a nodal loop implies robust gapless drumhead states on the surface Brillouin zone. We demonstrate how our classification works in all the nontrivial chiral classes and how it differs from the previous understanding of topologically protected nodal line semimetals.

Periodically driven four-dimensional topological insulator with tunable second Chern number. (arXiv:2401.02973v1 [cond-mat.mes-hall])
Zheng-Rong Liu, Rui Chen, Bin Zhou

In recent years, Floquet engineering has attracted considerable attention as a promising approach for tuning topological phase transitions. In this work, we investigate the effects of high-frequency time-periodic driving in a four-dimensional (4D) topological insulator, focusing on topological phase transitions at the off-resonant quasienergy gap. The 4D topological insulator hosts gapless three-dimensional boundary states characterized by the second Chern number $C_{2}$. We demonstrate that the second Chern number of 4D topological insulators can be modulated by tuning the amplitude of time-periodic driving. This includes transitions from a topological phase with $C_{2}=\pm3$ to another topological phase with $C_{2}=\pm1$, or to a topological phase with an even second Chern number $C_{2}=\pm2$ which is absent in the 4D static system. Finally, the approximation theory in the high-frequency limit further confirms the numerical conclusions.

BCS-BEC crossover in atomic Fermi gases in quasi-two-dimensional Lieb lattices: Effects of flat band and finite temperature. (arXiv:2401.02990v1 [cond-mat.quant-gas])
Hao Deng, Lin Sun, Chuping Li, Yuxuan Wu, Junru Wu, Qijin Chen

We investigate the finite-temperature superfluid behavior of ultracold atomic Fermi gases in quasi-two-dimensional Lieb lattices with a short-range attractive interaction, using a pairing fluctuation theory within the BCS-BEC crossover framework. We find that the presence of a flat band, along with van Hove singularities, leads to exotic quantum phenomena. As the Fermi level enters the flat band, both the gap and the superfluid transition temperature $T_c$ as a function of interaction change from a conventional exponential behavior into an unusual power law, and the evolution of superfluid densities with temperature also follows a power law even at weak interactions. The quantum geometric effects, manifested by an enhanced effective pair hopping integral, may contribute significantly to both $T_c$ and the superfluidities. As the chemical potential crosses the van Hove singularities in the weak interaction regime, the nature of pairing changes between particle-like and hole-like. A pair density wave state emerges at high densities with a relatively strong interaction strength.

Impact of a Lifshitz Transition on the onset of spontaneous coherence. (arXiv:2401.03013v1 [cond-mat.str-el])
Adam Eaton, Dibya Mukherjee, Herbert Fertig

Lifshitz transitions are topological transitions of a Fermi surface, whose signatures typically appear in the conduction properties of a host metal. Here, we demonstrate, using an extended Falicov- Kimball model of a two-flavor fermion system, that a Lifshitz transition which occurs in the noninteracting limit impacts interaction-induced insulating phases, even though they do not host Fermi surfaces. For strong interactions we find a first order transition between states of different polarization This transition line ends in a very unusual quantum critical endpoint, whose presence is stabilized by the onset of inter-flavor coherence. We demonstrate that the surfaces of maximum coherence in these states reflect the distinct Fermi surface topologies of the states separated by the non-interacting Lifshitz transition. The phenomenon is shown to be independent of the band topologies involved. Experimental realizations of our results are discussed for both electronic and optical lattice systems.

Improper two-dimensional electron gas formation. (arXiv:2401.03016v1 [cond-mat.mes-hall])
Daniel Bennett, Pablo Aguado-Puente, Emilio Artacho, Nicholas Bristowe

In spite of the interest in the two-dimensional electron gases (2DEGs) experimentally found at surfaces and interfaces, important uncertainties remain about the observed insulator--metal transitions (IMTs). Here we show how an explicit improper coupling of carrier sources with a relevant soft mode significantly affects the transition. The analysis presented here for 2DEGs at polar interfaces is based on group theory, Landau-Ginzburg theory, and illustrated with first-principles calculations for the prototypical case of the LaAlO$_3$/SrTiO$_3$ interface, for which such a structural transition has recently been observed. This direct coupling implies that the appearance of the soft mode is always accompanied by carriers. For sufficiently strong coupling an avalanche-like first-order IMT is predicted.

Phase transitions and scale invariance in topological Anderson insulators. (arXiv:2401.03028v1 [cond-mat.dis-nn])
Bryan D. Assunção, Gerson J. Ferreira, Caio H. Lewenkopf

We investigate disordered-driven transitions between trivial and topological insulator (TI) phases in two-dimensional (2D) systems. Our study primarily focuses on the BHZ model with Anderson disorder, while other standard 2DTI models exhibit equivalent features. The analysis is based on the local Chern marker (LCM), a local quantity that allows for the characterization of topological transitions in finite and disordered systems. Our simulations indicate that disorder-driven trivial to topological insulator transitions are nicely characterized by $\mathcal{C}_0$, the \textit{disorder averaged} LCM near the central cell of the system. We show that $\mathcal{C}_0$ is characterized by a single-parameter scaling, namely, $\mathcal{C}_0(M, W, L) \equiv \mathcal{C}_0(z)$ with $z = [W^\mu-W_c^\mu(M)]L$, where $M$ is the Dirac mass, $W$ is the disorder strength and $L$ is the system size, while $W_c(M) \propto \sqrt{M}$ and $\mu \approx 2$ stand for the critical disorder strength and critical exponent, respectively. Our numerical results are in agreement with a theoretical prediction based on a first-order Born approximation (1BA) analysis. These observations lead us to speculate that the universal scaling function we have found is rather general for amorphous and disorder-driven topological phase transitions.

Phonon thermal Hall effect in charge-compensated topological insulators. (arXiv:2401.03064v1 [cond-mat.str-el])
Rohit Sharma, Mahasweta Bagchi, Yongjian Wang, Yoichi Ando, Thomas Lorenz

From a systematic study of thermal and charge transport in various single crystals of compensated topological insulators we identify the evolution of a large low-temperature thermal Hall effect as a characteristic common feature. In order to separate phononic and electronic contributions in the measured longitudinal and transverse thermal conductivity, the electronic contributions are estimated from corresponding electrical resisivity and Hall effect measurements on the same samples by using the Wiedemann-Franz law. As may be expected for charge-compensated topological insulators the longitudinal thermal conductivity is phonon-dominated in all samples. However, we also find a pronounced field-linear thermal Hall effect that becomes most pronounced in the low-temperature range, where all samples are good electrical insulators. This indicates an underlying phononic mechanism of the thermal Hall effect and in this respect the topological insulators resemble other, mainly ionic, insulators, which have been reported to show a phonon-induced thermal Hall effect, but its underlying phononic mechanism remains to be identified. Our observation of a comparable thermal Hall ratio in topological insulators supports a theoretical scenario that explains a thermal Hall effect through skew scattering on charged impurities.

Non-Hermitian Dirac theory from Lindbladian dynamics. (arXiv:2401.03075v1 [hep-th])

This study investigates the intricate relationship between dissipative processes of open quantum systems and the non-Hermitian quantum field theory of relativistic fermionic systems. By examining the influence of dissipative effects on Dirac fermions via Lindblad formalism, we elucidate the effects of the coupling of relativistic Dirac particles with the environment. Employing rigorous theoretical analysis, we explore the impact of dissipative interactions and find the Lyapunov equation of the relativistic dissipation-driven fermionic system. By use of a thermal ansatz, one finds the solution to the Lyapunov equations in terms of a stationary Wigner distribution. Our results describe a non-hermitian fermionic system and provide valuable insights into dissipative quantum phenomena' fundamental mechanisms in relativistic fermionic systems, advancing our understanding of their behavior in non-equilibrium scenarios.

Endless Dirac nodal lines and high mobility in kagome semimetal Ni3In2Se2 single crystal. (arXiv:2401.03130v1 [cond-mat.mtrl-sci])
Sanand Kumar Pradhan, Sharadnarayan Pradhan, Priyanath Mal, P. Rambabu, Archana Lakhani, Bipul Das, Bheema Lingam Chittari, G. R. Turpu, Pradip Das

Kagome-lattice crystal is crucial in quantum materials research, exhibiting unique transport properties due to its rich band structure and the presence of nodal lines and rings. Here, we investigate the electronic transport properties and perform first-principles calculations for Ni$_{3}$In$_{2}$Se$_{2}$ kagome topological semimetal. First-principle calculations indicate six endless Dirac nodal lines and two nodal rings with a $\pi$-Berry phase in the Ni$_{3}$In$_{2}$Se$_{2}$ compound. The temperature-dependent resistivity is dominated by two scattering mechanisms: $s$-$d$ interband scattering occurs below 50 K, while electron-phonon ($e$-$p$) scattering is observed above 50 K. The magnetoresistance (MR) curve aligns with the theory of extended Kohler's rule, suggesting multiple scattering origins and temperature-dependent carrier densities. A maximum MR of 120\% at 2 K and 9 T, with a maximum estimated mobility of approximately 3000 cm$^{2}$V$^{-1}$s$^{-1}$ are observed. The Ni atom's hole-like d$_{x^{2}-y^{2} }$ and electron-like d$_{z^{2}}$ orbitals exhibit peaks and valleys, forming a local indirect-type band gap near the Fermi level (E$_{F}$). This configuration enhances the motion of electrons and holes, resulting in high mobility and relatively high magnetoresistance.

A Molecular Dynamics Study of Mechanical Properties of Vertically Stacked Silicene/MoS2 van der Waals Heterostructure. (arXiv:2401.03139v1 [cond-mat.mtrl-sci])
Bishwajit Kar, Plabon Paul, Md Arshadur Rahman, Mohammad Jane Alam Khan

Silicene is an intriguing silicon allotrope with a honeycomb lattice structure similar to graphene with slightly buckled geometry. Molybdenum disulfide (MoS2), on the other hand, is a significant 2D transition metal dichalcogenide that has demonstrated promise in a variety of applications. Van der Waals heterostructures, which are created by stacking distinct 2D crystals on top of each other, are becoming increasingly important due to their unique optoelectronic and electromechanical properties. Using molecular dynamics simulations, the mechanical characteristics of vertically stacked Silicene/MoS2 van der Waals heterostructures are examined in this study. The response and structural stability of the heterostructures at various loading orientations and temperatures are given particular attention. The research findings highlight that the fracture strength of the Silicene/MoS2 heterostructure decreases by 40% in both armchair and zigzag orientations when the temperature is raised from 100K to 600K. Furthermore, a linear decrease in Young's modulus is observed as temperature rises. It is noteworthy that the Rule of Mixture (ROM) predictions for Young's Moduli are observed to be marginally lower than the simulation results. The analyses reveal that the silicene layer fractures first under both loading directions shows crack propagation at +-60{\deg}in the armchair and predominantly perpendicular in zigzag, followed by subsequent MoS2 layer failure. The study also shows that the MoS2 layer largely determines the elastic properties of the heterostructure, whereas the silicene layer primarily dictates the failure of the heterostructure. These findings offer an in-depth understanding of the mechanical properties of Silicene/MoS2 heterostructures, with significant implications for their use in cutting-edge nanoelectronics and nanomechanical systems.

Cavity magnonics with domain walls in insulating ferromagnetic wires. (arXiv:2401.03164v1 [cond-mat.mes-hall])
Mircea Trif, Yaroslav Tserkovnyak

Magnetic domain walls (DWs) are topological defects that exhibit robust low-energy modes that can be harnessed for classical and neuromorphic computing. However, the quantum nature of these modes has been elusive thus far. Using the language of cavity optomechanics, we show how to exploit a geometric Berry-phase interaction between the localized DWs and the extended magnons in short ferromagnetic insulating wires to efficiently cool the DW to its quantum ground state or to prepare nonclassical states exhibiting a negative Wigner function that can be extracted from the power spectrum of the emitted magnons. Moreover, we demonstrate that magnons can mediate long-range entangling interactions between qubits stored in distant DWs, which could facilitate the implementation of a universal set of quantum gates. Our proposal relies only on the intrinsic degrees of freedom of the ferromagnet, and can be naturally extended to explore the quantum dynamics of DWs in ferrimagnets and antiferromagnets, as well as quantum vortices or skyrmions confined in insulating magnetic nanodisks.

Rectangular carbon nitrides C4N monolayers with a zigzag buckled structure: Quasi-one-dimensional Dirac nodal lines and topological flat edge states. (arXiv:2401.03402v1 [cond-mat.mtrl-sci])
Linyang Li, Jialei Li, Yawei Yu, Yuxuan Song, Jia Li, Xiaobiao Liu, François M. Peeters, Xin Chen, Guodong Liu

Due to the flexibility of C and N atoms in forming different types of bonds, the prediction of new two-dimensional (2D) carbon nitrides is a hot topic in the field of carbon-based materials. Using first-principles calculations, we propose two C4N monolayers with a zigzag buckled (ZB) structure. The ZB C4N monolayers contain raised-C (raised-N) atoms with sp3 hybridization, different from the traditional 2D graphene-like carbon nitride materials with sp2 hybridization. Interestingly, the band structures of the ZB C4N monolayers exhibit quasi-one-dimensional (quasi-1D) Dirac nodal line that results from the corresponding quasi-1D structure of the zigzag carbon chains, which is essentially different from the more common ring-shaped nodal line. The quasi-1D Dirac nodal line exhibits the following features: (i) gapless Dirac points, (ii) varying Fermi velocity, and (iii) slightly curved band along the high-symmetry path. All these features are successfully explained by our proposed tight-binding model that includes interactions up to the third nearest-neighbor. The Fermi velocity of the 2D system can reach 105 m/s, which is promising for applications in high-speed electronic devices. The topological flat band structure determined by the Zak phase and band inversion of the corresponding 1D system is edge-dependent, which is corresponding to the Su-Schrieffer-Heeger model, providing to rich physical phenomena.

Ground state phase diagram and the exotic phases in the spin-1/2 square lattice J1-J2-Jx model. (arXiv:2401.03434v1 [cond-mat.str-el])
Jianwei Yang, Zhao Liu, Ling Wang

The intricate interplay between frustration and spin chirality has the potential to give rise to unprecedented phases in frustrated quantum magnets. We examine the ground state phase diagram of the spin-1/2 square lattice J1-J2-Jx model by employing critical level crossings and ground state fidelity susceptibility (FS) using exact diagonalization (ED) with full lattice symmetries. Our analysis reveals the evolution of highly symmetric energy levels as a function of J2 at fixed Jx. During a magnetic to non-magnetic phase transition, the precise identification of the phase boundary is achieved through critical level crossings between the gapless excitation of a magnetic phase and the quasi-degenerate ground state of a non-magnet phase. Conversely, a direct transition between two non-magnetic phases is characterized by a FS peak accompanied by an avoided ground state level crossing, serving as a distinctive signal. Within a substantial range of Jx, we identify an anticipated chiral spin liquid (CSL) state and an adjacent nematic spin liquid (NSL) phase with a degeneracy of two on a cylinder. These two phases are demarcated by a nearly vertical boundary line at J2 = 0.65. This critical line terminates at the lower boundary of a magnetic ordered chiral spin solid (CSS) phase. We validate the topological nature of the CSL using the modular S matrix of the minimum entangled states (MES) on a torus, along with the entanglement spectra (ES) of even and odd sectors on a cylinder, employing an SU(2)-symmetric density matrix renormalization group (DMRG) method. Furthermore, we delve into a comprehensive discussion on the nature of the NSL, exploring aspects such as ground state degeneracy, the local bond energy landscape, and the singlet and triplet gaps on various tori. These analysis provide substantial evidence supporting the nematic nature of the NSL.

Pentagonal nanowires from topological crystalline insulators: a platform for intrinsic core-shell nanowires and higher-order topology. (arXiv:2401.03455v1 [cond-mat.mtrl-sci])
Ghulam Hussain, Giuseppe Cuono, Piotr Dziawa, Dorota Janaszko, Janusz Sadowski, Slawomir Kret, Boguslawa Kurowska, Jakub Polaczynski, Kinga Warda, Shahid Sattar, Carlo M. Canali, Alexander Lau, Wojciech Brzezicki, Tomasz Story, Carmine Autieri

We report on the experimental realization of Pb1-xSnxTe pentagonal nanowires (NWs) with [110] orientation using molecular beam epitaxy techniques. Using first-principles calculations, we investigate the structural stability in NWs of SnTe and PbTe in three different structural phases: cubic, pentagonal with [001] orientation and pentagonal with [110] orientation. Within a semiclassical approach, we show that the interplay between ionic and covalent bonds favors the formation of pentagonal NWs. Additionally, we find that this pentagonal structure is more likely to occur in tellurides than in selenides. The disclination and twin boundary cause the electronic states originating from the NW core region to generate a conducting band connecting the valence and conduction bands, creating a symmetry-enforced metallic phase. The metallic core band has opposite slopes in the cases of Sn and Te twin boundary, while the bands from the shell are insulating. We finally study the electronic and topological properties of pentagonal NWs unveiling their potential as a new platform for higher-order topology and fractional charge. These pentagonal NWs represent a unique case of intrinsic core-shell one-dimensional nanostructures with distinct structural, electronic and topological properties between the core and the shell region.

Coexistence of 1D and 2D topology and genesis of Dirac cones in the chiral Aubry-Andr\'e model. (arXiv:2401.03541v1 [cond-mat.mes-hall])
Tiago Antão, Daniel Miranda, Nuno Peres

We construct a one-dimensional (1D) topological SSH-like model with chiral symmetry and a superimposed hopping modulation, which we call the chiral Aubry-Andr\'e model. We show that its topological properties can be described in terms of a pair (C,W) of a two-dimensional (2D) Chern number C, stemming from a superspace description of the model, and a 1D winding number W, originating in its chiral symmetric nature. Thus, we showcase for the first time explicit coexistence of 1D and 2D topology in a model existing in 1D physical space. We detail the superspace description by showcasing how our model can be mapped to a Harper-Hofstadter model, familiar from the description of the integer quantum Hall effect, and analyze the vanishing field limit analytically. An extension of the method used for vanishing fields is provided in order to handle any finite fields, corresponding to hopping modulations both commensurate and incommensurate with the lattice. In addition, this formalism allows us to obtain certain features of the 2D superspace model, such as its number of massless Dirac nodes, purely in terms of topological quantities, computed without the need to go into momentum space.

Engineering topological chiral transport in a flat-band lattice of ultracold atoms. (arXiv:2401.03611v1 [cond-mat.quant-gas])
Hang Li, Qian Liang, Zhaoli Dong, Hongru Wang, Wei Yi, Jian-Song Pan, Bo Yan

The manipulation of particle transport in synthetic quantum matter is an active research frontier for its theoretical importance and potential applications. Here we experimentally demonstrate an engineered topological transport in a synthetic flat-band lattice of ultracold $^{87}$Rb atoms. We implement a quasi-one-dimensional rhombic chain with staggered flux in the momentum space of the atomic condensate and observe biased local oscillations that originate from the interplay of the staggered flux and flat-band localization under the mechanism of Aharonov-Bohm caging. Based on these features, we design and experimentally confirm a state-dependent chiral transport under the periodic modulation of the synthetic flux. We show that the phenomenon is topologically protected by the winding of the Floquet Bloch bands of a coarse-grained effective Hamiltonian. The observed chiral transport offers a strategy for efficient quantum device design where topological robustness is ensured by fast Floquet driving and flat-band localization.

Optically controllable localization of exciton polariton condensates in a potential lattice. (arXiv:2401.03625v1 [physics.optics])
Qiang Ai, Jan Wingenbach, Xinmiao Yang, Jing Wei, Zaharias Hatzopoulos, Pavlos G. Savvidis, Stefan Schumacher, Xuekai Ma, Tingge Gao

Exciton polaritons are inherently non-Hermitian systems with adjustable gain and loss coefficients. In this work we show that exciton polariton condensates can be selectively localized in an optically-induced lattice with equal potential depth by judiciously controlling a second focused pump with a very small size. Specifically, the localized polariton condensate can be tuned among different potential traps by adjusting the relative distance between the small pump spot and the potential lattice. The adjustment of the excitation position of the smaller pump and its combination with the bigger pump for the potential creation induce a position-dependent loss distribution across the system. The localization of the exciton polariton condensate and its control are independent of the orientation of the potential lattice, thus, even in slightly disordered system, one can selectively excite such localized polariton condensates. Our results illuminate a path to manipulate the non-Hermitian bosonic condensates in integrated photonic chips.

Thermal fluctuations (eventually) unfold nanoscale origami. (arXiv:2401.03628v1 [cond-mat.stat-mech])
Matthew Grasinger, Pradeep Sharma

There has been a resurgence of interest in using origami principles--along with $2$D materials--to design a wide array of nanoscale devices. In this work, we take cognizance of the fact that small-scale devices are vulnerable to entropic thermal fluctuations and thus a foundational question underlying small-scale origami pertains to its stability. To properly understand the behavior of these origami-based nanodevices, we must simultaneously consider the geometric mechanics of origami along with the interplay between thermal fluctuations, entropic repulsive forces, van der Waals attraction, and other molecular-scale phenomena. In this work, to elucidate the rich behavior underpinning the evolution of an origami device at the nanoscale, we develop a minimal statistical mechanics model of folded nanoscale sheets. We use the model to investigate (1) the thermodynamic multistability of nanoscale origami structures and (2) the rate at which thermal fluctuations drive its unfolding--that is, its temporal stability. We identify, for the first time, an entropic torque that is a critical driving force for the unfolding process. Both the thermodynamic multistability and temporal stability have a nontrivial dependence on the origami's bending stiffness, the radii of curvature of its creases, the ambient temperature, its thickness, and its interfacial energy (between folded layers). Specifically, for graphene, we show that there is a critical side length below which it can no longer be folded with stability; similarly, there exists a critical crease diameter, membrane thickness (e.g. for multilayer graphene), and temperature above which a crease cannot be stably folded. To investigate the rate of thermally driven unfolding, we extend Kramers' escape rate theory to cases where the minima of the energy well occurs at a boundary.

Probing Chiral-Symmetric Higher-Order Topological Insulators with Multipole Winding Number. (arXiv:2401.03699v1 [cond-mat.mes-hall])
Ling Lin, Chaohong Lee

The interplay between crystalline symmetry and band topology gives rise to unprecedented lower-dimensional boundary states in higher-order topological insulators (HOTIs). However, the measurement of the topological invariants of HOTIs remains a significant challenge. Here, we propose the multipole winding number (MWN) for chiral-symmetric HOTIs, achieved by applying a corner twisted boundary condition. The MWN, arising from both bulk and boundary states, may accurately capture the bulk-corner correspondence in finite systems. To address the measurement challenge, we leverage the perturbative nature of the corner twisted boundary condition and develop a real-space approach for determining the MWN in both two-dimensional and three-dimensional systems. The real-space formula provides an experimentally viable strategy for directly probing the topology of chiral-symmetric HOTIs through dynamical evolution. Our findings not only highlight the twisted boundary condition as a powerful tool for investigating HOTIs, but also establish a paradigm for exploring real-space formulas for the topological invariants of HOTIs.

Failure of the Mott's formula for the Thermopower in Carbon Nanotubes. (arXiv:2401.03721v1 [cond-mat.mes-hall])
A. V. Kavokin, M. E. Portnoi, A. A. Varlamov, Yuriy Yerin

The well-known Mott's formula links the thermoelectric power characterised by Seebeck coefficient to conductivity. We calculate analytically the thermoelectric current and Seebeck coefficient in one-dimensional systems and show that, while the prediction of Mott's formula is valid for Dirac fermions, it is misleading for the carriers having a parabolic dispersion. We apply the developed formalism to metallic single wall carbon nanotubes and obtain a non-trivial non-monotonic dependence of the Seebeck coefficient on the chemical potential. We emphasize that, in contrast to the Mott's formula, the classical Kelvin's formula that links thermoelectric power to the temperature derivative of the chemical potential is perfectly valid in carbon nanotubes in the ballistic regime. Interestingly, however, the Kelvin's formula fails in two- and three-dimensional systems in the ballistic regime.

Atom-by-Atom Mapping and Understanding of In-Plane Anisotropy in GaTe. (arXiv:2401.03731v1 [cond-mat.mtrl-sci])
Jieling Tan, Jiang-Jing Wang, Hang-Ming Zhang, Han-Yi Zhang, Heming Li, Yu Wang, Yuxing Zhou, Volker L. Deringer, Wei Zhang

Main-group chalcogenides with layered crystal structures and high in-plane anisotropy are attracting increasing interest for a range of practical applications. The III-VI semiconductor, monoclinic gallium monotelluride (m-GaTe), has been recently used in high-sensitivity photodetectors/phototransistors and electronic memory applications due to its anisotropic properties yielding superior optical and electrical performance. Despite these applications, the origin of such anisotropy, namely the complex structural and bonding environments in GaTe nanostructures remain to be fully understood. In the present work, we report a comprehensive atomic-scale characterization of m-GaTe by state-of-the-art element-resolved atomic-scale microscopy experiments. By performing imaging for two different view directions, we are able to directly measure the in-plane anisotropy of m-GaTe at the sub-Angstrom level, and show that it compares well with the results of first-principles modeling. Quantum-chemical bonding analyses provide a detailed picture of the atomic neighbor interactions within the layers, revealing that vertical Ga-Ga homopolar bonds get stronger when they are distorted and rotated, inducing the strong in-plane anisotropy.

Skyrmion Qubits: Challenges For Future Quantum Computing Applications. (arXiv:2401.03773v1 [cond-mat.mes-hall])
Christina Psaroudaki, Elias Peraticos, Christos Panagopoulos

Magnetic nano-skyrmions develop quantized helicity excitations, and the quantum tunneling between nano-skyrmions possessing distinct helicities is indicative of the quantum nature of these particles. Experimental methods capable of non-destructively resolving the quantum aspects of topological spin textures, their local dynamical response, and their functionality now promise practical device architectures for quantum operations. With abilities to measure, engineer, and control matter at the atomic level, nano-skyrmions present opportunities to translate ideas into solid-state technologies. Proof-of-concept devices will offer electrical control over the helicity, opening a promising new pathway towards functionalizing collective spin states for the realization of a quantum computer based on skyrmions. This Perspective aims to discuss developments and challenges in this new research avenue in quantum magnetism and quantum information.

Active Diffusion of Self-Propelled Particles in Semi-Flexible Polymer Networks. (arXiv:2401.03819v1 [cond-mat.soft])
Yeongjin Kim, Won Kyu Kim, Jae-Hyung Jeon

Mesh-like structures, such as mucus gel or cytoskeleton networks, are ubiquitous in biological systems. These intricate structures are composed of cross-linked, semi-flexible bio-filaments, crucial to numerous biological processes. In many biological systems, active self-propelled particles like motor proteins or bacteria navigate these intricate polymer networks.In this study, we develop a computational model of three-dimensional cubic-topological, swollen polymer networks of semi-flexible filaments. We perform Langevin dynamics simulations to investigate the diffusion of active tracer particles navigating through these networks. By analyzing various physical observables, we investigate the effects of mesh-to-particle size ratio, P\'eclet number of active particles, and bending stiffness of the polymer networks upon active trapped-and-hopping diffusion of the tracer. When the tracer size is equal to or larger than the mesh size, the polymer stiffness substantially enhances trapping while suppressing the hopping process. Notably, the mean trapped time exhibits an exponential growth law to the bending stiffness with an activity-dependent slope. An analytic theory based on the mean first-passage time of active particles in a harmonic potential is developed. Our findings deepen the comprehension of the intricate interplay between the polymer's bending stiffness, tracer size, and the activity of tracer particles. This knowledge can shed light on important biological processes, such as motor-driven cargo transport or drug delivery, which hinge on the behavior of active particles within biological gels.

Circumventing the polariton bottleneck via dark excitons in 2D semiconductors. (arXiv:2401.03825v1 [cond-mat.mes-hall])
Jamie M. Fitzgerald, Roberto Rosati, Beatriz Ferreira, Hangyong Shan, Christian Schneider, Ermin Malic

Efficient scattering into the exciton polariton ground state is a key prerequisite for generating Bose-Einstein condensates and low-threshold polariton lasing. However, this can be challenging to achieve at low densities due to the polariton bottleneck effect that impedes phonon-driven scattering into low-momentum polariton states. The rich exciton landscape of transition metal dichalcogenides (TMDs) provides potential intervalley scattering pathways via dark excitons to rapidly populate these polaritons. Here, we present a microscopic study exploring the time- and momentum-resolved relaxation of exciton polaritons supported by a \ce{MoSe2} monolayer integrated within a Fabry-Perot cavity. By exploiting phonon-assisted transitions between momentum-dark excitons and the lower polariton branch, we demonstrate that it is possible to circumvent the bottleneck region and efficiently populate the polariton ground state. Furthermore, this intervalley pathway is predicted to give rise to, yet unobserved, angle-resolved phonon sidebands in low-temperature photoluminescence spectra that are associated with momentum-dark excitons. This represents a distinctive experimental signature for efficient phonon-mediated polariton-dark-exciton interactions.

Optical spin Hall effect pattern switching in polariton condensates in organic single-crystal microbelts. (arXiv:2401.03877v1 [cond-mat.mes-hall])
Jiahuan Ren, Teng Long, Chunling Gu, Hongbing Fu, Dmitry Solnyshkov, Guillaume Malpuech, Qing Liao

Topological polaritons, combining the robustness of the topological protected edge states to defects and disorder with the strong nonlinear properties of polariton bosons, represent an excellent platform to investigate novel photonic topological phases. In this work, we demonstrated the optical spin Hall effect (OSHE) and its symmetry switching in the exciton-polariton regime of pure DPAVBi crystals. Benefiting from the photonic Rashba-Dresselhaus spin-orbit coupling in organic crystals, we observed the separation of left- and right-circularly-polarized polariton emission in two-dimensional momentum space and real space, a signature of the OSHE. Above the lasing threshold, the OSHE pattern changes due to transverse quantization in the microbelt. This device without superlattice structure has great potential applications in topological polaritonics, such as information transmission, photonic integrated chips and quantum information.

Quantum revivals in HgTe/CdTe quantum wells and topological phase transitions. (arXiv:2401.03884v1 [cond-mat.mes-hall])
A. Mayorgas, M. Calixto, N.A. Cordero, E. Romera, O. Castaños

The time evolution of a wave packet is a tool to detect topological phase transitions in two-dimensional Dirac materials, such as graphene and silicene. Here we extend the analysis to HgTe/CdTe quantum wells and study the evolution of their electron current wave packet, using 2D effective Dirac Hamiltonians and different layer thicknesses. We show that the two different periodicities that appear in this temporal evolution reach a minimum near the critical thickness, where the system goes from normal to inverted regime. Moreover, the maximum of the electron current amplitude changes with the layer thickness, identifying that current maxima reach their higher value at the critical thickness. Thus, we can characterize the topological phase transitions in terms of the periodicity and amplitude of the electron currents.

Room-Temperature Plasmon-Assisted Resonant THz Detection in Single-layer Graphene Transistors. (arXiv:2401.04005v1 [cond-mat.mes-hall])
José M. Caridad, Óscar Castelló, Sofía M. López Baptista, Takashi Taniguchi, Kenji Watanabe, Hartmut G. Roskos, Juan A. Delgado-Notario

Frequency-selective or even frequency-tunable Terahertz (THz) photodevices are critical components for many technological applications that require nanoscale manipulation, control and confinement of light. Within this context, gate-tunable phototransistors based on plasmonic resonances are often regarded as the most promising devices for frequency-selective detection of THz fields. The exploitation of constructive interference of plasma waves in such detectors not only promises frequency selectivity, but also a pronounced sensitivity enhancement at the target frequencies. However, clear signatures of plasmon-assisted resonances in THz detectors have been only revealed at cryogenic temperatures so far, and remain unobserved at application-relevant room-temperature conditions. In this work, we demonstrate the sought-after room-temperature resonant detection of THz radiation in short-channel gated photodetectors made from high-quality single-layer graphene. The survival of this intriguing resonant regime at room-temperature ultimately relies on the weak intrinsic electron-phonon scattering in graphene, which avoids the damping of the plasma oscillations.

Composite cores of monopoles and Alice rings in spin-2 Bose-Einstein condensates. (arXiv:2401.04103v1 [cond-mat.quant-gas])
Giuseppe Baio, Magnus O. Borgh

We show that energy relaxation causes a point defect in the uniaxial-nematic phase of a spin-2 Bose-Einstein condensate to deform into a spin-Alice ring that exhibits a composite core structure with distinct topology at short and long distances from the singular line. An outer biaxial-nematic core exhibits a spin half-quantum vortex structure with a uniaxial-nematic inner core. By numerical simulation we demonstrate a dynamical oscillation between the spin-Alice ring and a split-core hedgehog configuration via the appearance of ferromagnetic rings with associated vorticity inside an extended core region. We further show that a similar dynamics is exhibited by a spin-Alice ring surrounding a spin-vortex line resulting from the relaxation of a monopole situated on a spin-vortex line in the biaxial-nematic phase. In the cyclic phase similar states are shown instead to form extended phase-mixing cores containing rings with fractional mass circulation or cores whose spatial shape reflect the order-parameter symmetry of cyclic inner core, depending on the initial configuration.

Geometric inhibition of superflow in single-layer graphene suggests a staggered-flux superconductivity in bilayer and trilayer graphene. (arXiv:2401.04106v1 [cond-mat.supr-con])
Xinyao Zhang, Ruoshi Jiang, Xingchen Shen, Xiaomo Huang, Qing-Dong Jiang, Wei Ku

In great contrast to the numerous discoveries of superconductivity in layer-stacked graphene systems, the absence of superconductivity in the simplest and cleanest monolayer graphene remains a big puzzle. Here, through realistic computation of electronic structure, we identify a systematic trend that superconductivity appears to emerge only upon alteration of the low-energy electronic lattice from the underlying honeycomb atomic structure. We then demonstrate that this inhibition can result from from geometric frustration of the bond lattice that disables quantum phase coherence of the order parameter residing on it. In comparison, upon deviating from the honeycomb lattice, relief of geometric frustration allows robust superfluidity with non-trivial spatial structure. For the specific examples of bilayer and trilayer graphene under an external electric field, such bond centered order parameter would develop superfluidity with staggered flux that breaks the time-reversal symmetry. Our study also suggests the possible realization of the long-sought superconductivity in single-layer graphene via the application of uni-directional strain.

Toward a new theory of the fractional quantum Hall effect. (arXiv:2206.05152v6 [cond-mat.mes-hall] UPDATED)
S. A. Mikhailov

The fractional quantum Hall effect was experimentally discovered in 1982. It was observed that the Hall conductivity $\sigma_{yx}$ of a two-dimensional electron system is quantized, $\sigma_{yx}=e^2/3h$, in the vicinity of the Landau level filling factor $\nu=1/3$. In 1983, Laughlin proposed a trial many-body wave function, which he claimed described a ``new state of matter'' -- a homogeneous incompressible liquid with fractionally charged quasiparticles. Here I develop an exact diagonalization theory that allows calculation of the energy and other physical properties of the ground and excited states of a system of $N$ two-dimensional Coulomb interacting electrons in a strong magnetic field. I analyze the energies, electron densities, and other physical properties of the systems with $N\le 7$ electrons, continuously as a function of magnetic field in the range $1/4\lesssim\nu<1$. The results show that both the ground and excited states of the system resemble a sliding Wigner crystal, whose parameters are influenced by the magnetic field. Energy gaps in the many-particle spectra appear and disappear as the magnetic field changes. I also calculate the physical properties of the $\nu=1/3$ Laughlin state for $N\le 8$ and show that neither this state nor its fractionally charged excitations describe the physical reality. The results obtained shed new light on the nature of the ground and excited states in the fractional quantum Hall effect.

A microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn$_3$. (arXiv:2208.02211v2 [cond-mat.str-el] UPDATED)
W. Simeth, Z. Wang, E. A. Ghioldi, D. M. Fobes, A. Podlesnyak, N. H. Sung, E. D. Bauer, J. Lass, J. Vonka, D. G. Mazzone, C. Niedermayer, Yusuke Nomura, Ryotaro Arita, C. D. Batista, F. Ronning, M. Janoschek

Electrons at the border of localization generate exotic states of matter across all classes of strongly correlated electron materials and many other quantum materials with emergent functionality. Heavy electron metals are a model example, in which magnetic interactions arise from the opposing limits of localized and itinerant electrons. This remarkable duality is intimately related to the emergence of a plethora of novel quantum matter states such as unconventional superconductivity, electronic-nematic states, hidden order and most recently topological states of matter such as topological Kondo insulators and Kondo semimetals and putative chiral superconductors. The outstanding challenge is that the archetypal Kondo lattice model that captures the underlying electronic dichotomy is notoriously difficult to solve for real materials. Here we show, using the prototypical strongly-correlated antiferromagnet CeIn$_3$, that a multi-orbital periodic Anderson model embedded with input from ab initio bandstructure calculations can be reduced to a simple Kondo-Heisenberg model, which captures the magnetic interactions quantitatively. We validate this tractable Hamiltonian via high-resolution neutron spectroscopy that reproduces accurately the magnetic soft modes in CeIn$_3$, which are believed to mediate unconventional superconductivity. Our study paves the way for a quantitative understanding of metallic quantum states such as unconventional superconductivity.

Spin-order-dependent magneto-elastic coupling in two dimensional antiferromagnetic MnPSe$_3$ observed through Raman spectroscopy. (arXiv:2303.05554v2 [cond-mat.mtrl-sci] UPDATED)
Daniel J. Gillard, Daniel Wolverson, Oscar M. Hutchings, Alexander I. Tartakovskii

Layered antiferromagnetic materials have emerged as a novel subset of the two-dimensional family providing a highly accessible regime with prospects for layer-number-dependent magnetism. Furthermore, transition metal phosphorous trichalcogenides, MPX3 (M = transition metal; X = chalcogen) provide a platform for investigating fundamental interactions between magnetic and lattice degrees of freedom providing new insights for developing fields of spintronics and magnonics. Here, we use a combination of temperature dependent Raman spectroscopy and density functional theory to explore magnetic-ordering-dependent interactions between the manganese spin degree of freedom and lattice vibrations of the non-magnetic sub-lattice via a Kramers-Anderson super-exchange pathway in both bulk, and few-layer, manganese phosphorous triselenide (MnPSe$_3$). We observe a nonlinear temperature dependent shift of phonon modes predominantly associated with the non-magnetic sub-lattice, revealing their non-trivial spin-phonon coupling below the N{\'e}el temperature at 74 K, allowing us to extract mode-specific spin-phonon coupling constants.

Antiferromagnetically ordered Dirac semimetal in Hubbard model with spin-orbit coupling. (arXiv:2303.17101v3 [cond-mat.str-el] UPDATED)
Garima Goyal, Dheeraj Kumar Singh

We examine the possible existence of Dirac semimetal with magnetic order in a two-dimensional system with a nonsymmorphic symmetry by using the Hartree-Fock mean-field theory within the Hubbard model. We locate the region in the second-neighbor spin-orbit coupling vs Hubbard interaction phase diagram, where such a state is stabilized. The edge states for the ribbons along two orthogonal directions concerning the orientation of in-plane magnetic moments are obtained. Finally, the effect of the in-plane magnetic field, which results in the stabilization of the Weyl semimetallic state, and the nature of the edge states corresponding to the Weyl semimetallic state for ribbon geometries are also explored.

Universal platform of point-gap topological phases from topological materials. (arXiv:2304.08110v4 [cond-mat.mes-hall] UPDATED)
Daichi Nakamura, Kazuya Inaka, Nobuyuki Okuma, Masatoshi Sato

Whereas point-gap topological phases are responsible for exceptional phenomena intrinsic to non-Hermitian systems, their realization in quantum materials is still elusive. Here we propose a simple and universal platform of point-gap topological phases constructed from Hermitian topological insulators and superconductors. We show that (d-1)-dimensional point-gap topological phases are realized by making a boundary in d-dimensional topological insulators and superconductors dissipative. A crucial observation of the proposal is that adding a decay constant to boundary modes in d-dimensional topological insulators and superconductors is topologically equivalent to attaching a (d-1)-dimensional point-gap topological phase to the boundary. We furthermore establish the proposal from the extended version of the Nielsen-Ninomiya theorem, relating dissipative gapless modes to point-gap topological numbers. From the bulk-boundary correspondence of the point-gap topological phases, the resultant point-gap topological phases exhibit exceptional boundary states or in-gap higher-order non-Hermitian skin effects.

Microcanonical windows on quantum operators. (arXiv:2304.10948v3 [cond-mat.stat-mech] UPDATED)
Silvia Pappalardi, Laura Foini, Jorge Kurchan

We discuss the construction of a microcanonical projection WOW of a quantum operator O induced by an energy window filter W, its spectrum, and the retrieval of canonical many-time correlations from it.

Twistronics of Kekul\'e Graphene: Honeycomb and Kagome Flat Bands. (arXiv:2305.19927v2 [cond-mat.mes-hall] UPDATED)
Michael G. Scheer, Biao Lian

Kekul\'e-O order in graphene, which has recently been realized experimentally, induces Dirac electron masses on the order of $m \sim 100 \text{meV}$. We show that twisted bilayer graphene in which one or both layers have Kekul\'e-O order exhibits nontrivial flat electronic bands on honeycomb and kagome lattices. When only one layer has Kekul\'e-O order, there is a parameter regime for which the lowest four bands at charge neutrality form an isolated two-orbital honeycomb lattice model with two flat bands. The bandwidths are minimal at a magic twist angle $\theta \approx 0.7^\circ$ and Dirac mass $m \approx 100 \text{meV}$. When both layers have Kekul\'e-O order, there is a large parameter regime around $\theta\approx 1^\circ$ and $m\gtrsim 100 \text{meV}$ in which the lowest three valence and conduction bands at charge neutrality each realize isolated kagome lattice models with one flat band, while the next three valence and conduction bands are flat bands on triangular lattices. These flat band systems may provide a new platform for strongly correlated phases of matter.

Reliability and operation cost of underdamped memories during cyclic erasures. (arXiv:2306.15573v2 [cond-mat.stat-mech] UPDATED)
Salambô Dago, Sergio Ciliberto, Ludovic Bellon

The reliability of fast repeated erasures is studied experimentally and theoretically in a 1-bit underdamped memory. The bit is encoded by the position of a micro-mechanical oscillator whose motion is confined in a double well potential. To contain the energetic cost of fast erasures, we use a resonator with high quality factor $Q$: the erasure work $W$ is close to Landauer's bound, even at high speed. The drawback is the rise of the system's temperature $T$ due to a weak coupling to the environment. Repeated erasures without letting the memory thermalize between operations result in a continuous warming, potentially leading to a thermal noise overcoming the barrier between the potential wells. In such case, the reset operation can fail to reach the targeted logical state. The reliability is characterized by the success rate $R^s_i$ after $i$ successive operations. $W$, $T$ and $R^s_i$ are studied experimentally as a function of the erasure speed. Above a velocity threshold, $T$ soars while $R^s_i$ collapses: the reliability of too fast erasures is low. These experimental results are fully justified by two complementary models. We demonstrate that $Q\simeq 10$ is optimal to contain energetic costs and maintain high reliability standards for repeated erasures at any speed.

Design of a Majorana trijunction. (arXiv:2307.03299v2 [cond-mat.mes-hall] UPDATED)
Juan Daniel Torres Luna, Sathish R. Kuppuswamy, Anton R. Akhmerov

Braiding of Majorana states demonstrates their non-Abelian exchange statistics. One implementation of braiding requires control of the pairwise couplings between all Majorana states in a trijunction device. To have adiabaticity, a trijunction device requires the desired pair coupling to be sufficiently large and the undesired couplings to vanish. In this work, we design and simulate a trijunction device in a two-dimensional electron gas with a focus on the normal region that connects three Majorana states. We use an optimisation approach to find the operational regime of the device in a multi-dimensional voltage space. Using the optimization results, we simulate a braiding experiment by adiabatically coupling different pairs of Majorana states without closing the topological gap. We then evaluate the feasibility of braiding in a trijunction device for different shapes and disorder strengths.

Fractional Skyrme lines in ferroelectric barium titanate. (arXiv:2307.08443v2 [cond-mat.mtrl-sci] UPDATED)
Chris Halcrow, Egor Babaev

We predict a topological defect in ferroelectric barium titanate which we call a skyrme line. These are line-like objects characterized by skyrmionic topological charge. As well as configurations with integer charge, the charge density can split into well-localized fractional parts. We show that under certain conditions the fractional skyrme lines are stable. We discuss a mechanism to create fractional topological charge objects and investigate their stability.

(2+1)D SU(2) Yang-Mills Lattice Gauge Theory at finite density via tensor networks. (arXiv:2307.09396v2 [hep-lat] UPDATED)
Giovanni Cataldi, Giuseppe Magnifico, Pietro Silvi, Simone Montangero

We numerically simulate a non-Abelian lattice gauge theory in two spatial dimensions, with Tensor Networks (TN). We focus on the SU(2) Yang-Mills model in Hamiltonian formulation, with dynamical matter and minimally truncated gauge field (hardcore gluon). Thanks to the TN sign-problem-free approach, we characterize the phase diagram of the model at zero and finite baryon number as a function of the quark bare mass and color charge. Already at intermediate system sizes, we distinctly detect a liquid phase of quark-pair bound-state quasi-particles (baryons), whose mass is finite towards the continuum limit. Interesting phenomena arise at the transition boundary where color-electric and color-magnetic terms are maximally frustrated: for low quark masses, we see traces of potential deconfinement, while for high masses, signatures of a possible topological order.

Aggregation and structural phase transitions of semiflexible polymer bundles: a braided circuit topology approach. (arXiv:2308.14883v2 [cond-mat.soft] UPDATED)
Jonas Berx, Alireza Mashaghi

We present a braided circuit topology framework for investigating topology and structural phase transitions in aggregates of semiflexible polymers. In the conventional approach to circuit topology, which specifically applies to single isolated folded linear chains, the number and arrangement of contacts within the circuitry of a folded chain give rise to increasingly complex fold topologies. Another avenue for achieving complexity is through the interaction and entanglement of two or more folded linear chains. The braided circuit topology approach describes the topology of such multiple-chain systems and offers topological measures such as writhe, complexity, braid length, and isotopy class. This extension of circuit topology to multichains reveals the interplay between collapse, aggregation, and entanglement. In this work, we show that circuit topological motif fractions are ideally suited order parameters to characterise structural phase transitions in entangled systems that can detect structural re-ordering other measures cannot.

Piezoelectric Electrostatic Superlattices in Monolayer MoS$_2$. (arXiv:2309.01347v2 [cond-mat.mtrl-sci] UPDATED)
Ashwin Ramasubramaniam, Doron Naveh

Modulation of electronic properties of materials by electric fields is central to the operation of modern semiconductor devices, providing access to complex electronic behaviors and greater freedom in tuning the energy bands of materials. Here, we explore one-dimensional superlattices induced by a confining electrostatic potential in monolayer MoS$_2$, a prototypical two-dimensional semiconductor. Using first-principles calculations, we show that periodic potentials applied to monolayer MoS$_2$ induce electrostatic superlattices in which the response is dominated by structural distortions relative to purely electronic effects. These structural distortions reduce the intrinsic band gap of the monolayer substantially while also polarizing the monolayer through piezoelectric coupling, resulting in spatial separation of charge carriers as well as Stark shifts that produce dispersive minibands. Importantly, these minibands inherit the valley-selective magnetic properties of monolayer MoS$_2$, enabling fine control over spin-valley coupling in MoS$_2$ and similar transition-metal dichalcogenides.

Relaxation terms for anomalous hydrodynamic transport in Weyl semimetals from kinetic theory. (arXiv:2309.05692v3 [hep-th] UPDATED)
Andrea Amoretti, Daniel K. Brattan, Luca Martinoia, Ioannis Matthaiakakis, Jonas Rongen

We consider as a model of Weyl semimetal thermoelectric transport a $(3+1)$-dimensional charged, relativistic and relaxed fluid with a $U(1)_{V} \times U(1)_{A}$ chiral anomaly. We take into account all possible mixed energy, momentum, electric and chiral charge relaxations, and discover which are compatible with electric charge conservation, Onsager reciprocity and a finite DC conductivity. We find that all relaxations respecting these constraints necessarily render the system open and violate the second law of thermodynamics. We then demonstrate how the relaxations we have found arise from kinetic theory and a modified relaxation time approximation. Our results lead to DC conductivities that differ from those found in the literature opening the path to experimental verification.

Braiding topology of symmetry-protected degeneracy points in non-Hermitian systems. (arXiv:2309.16152v2 [quant-ph] UPDATED)
Jia-Zheng Li, Kai Bai, Cheng Guo, Tian-Rui Liu, Liang Fang, Duanduan Wan, Meng Xiao

Degeneracy points in non-Hermitian systems are of great interest. While a homotopic framework exists for understanding their behavior in the absence of symmetry, it does not apply to symmetry-protected degeneracy points with reduced codimension. In this work, utilizing algebraic topology, we provide a systematic classification of these symmetry-protected degenerate points and investigate the braid conservation rule followed by them. Using a model Hamiltonian and circuit simulation, we discover that, contrary to simple annihilation, pairwise-created symmetry-protected degeneracy points merge into a higher-order degeneracy point, which goes beyond the abelian picture. Our findings empower researchers across diverse fields to uncover new phenomena and applications harnessing symmetry-protected non-Hermitian degeneracy points.

Growing Extended Laughlin States in a Quantum Gas Microscope: A Patchwork Construction. (arXiv:2309.17402v2 [cond-mat.quant-gas] UPDATED)
Felix A. Palm, Joyce Kwan, Brice Bakkali-Hassani, Markus Greiner, Ulrich Schollwöck, Nathan Goldman, Fabian Grusdt

The study of fractional Chern insulators and their exotic anyonic excitations poses a major challenge in current experimental and theoretical research. Quantum simulators, in particular ultracold atoms in optical lattices, provide a promising platform to realize, manipulate, and understand such systems with a high degree of controllability. Recently, an atomic $\nu=1/2$ Laughlin state has been realized experimentally for a small system of two particles on 4 by 4 sites. The next challenge concerns the preparation of Laughlin states in extended systems, ultimately giving access to anyonic braiding statistics or gapless chiral edge-states in systems with open boundaries. Here, we propose and analyze an experimentally feasible scheme to grow larger Laughlin states by connecting multiple copies of the already existing 4-by-4-system. First, we present a minimal setting obtained by coupling two of such patches, producing an extended 8-by-4-system with four particles. Then, we analyze different preparation schemes, setting the focus on two shapes for the extended system, and discuss their respective advantages: While growing strip-like lattices could give experimental access to the central charge, square-like geometries are advantageous for creating quasi-hole excitations in view of braiding protocols. We highlight the robust quantization of the fractional quasi-hole charge upon using our preparation protocol. We benchmark the performance of our patchwork preparation scheme by comparing it to a protocol based on coupling one-dimensional chains. We find that the patchwork approach consistently gives higher target-state fidelities, especially for elongated systems. The results presented here pave the way towards near-term implementations of extended Laughlin states in quantum gas microscopes and the subsequent exploration of exotic properties of topologically ordered systems in experiments.

Topological aspects of brane fields: solitons and higher-form symmetries. (arXiv:2311.09293v2 [hep-th] UPDATED)
Salvatore D. Pace, Yu Leon Liu

In this note, we classify topological solitons of $n$-brane fields, which are nonlocal fields that describe $n$-dimensional extended objects. We consider a class of $n$-brane fields that formally define a homomorphism from the $n$-fold loop space $\Omega^n X_D$ of spacetime $X_D$ to a space $\mathcal{E}_n$. Examples of such $n$-brane fields are Wilson operators in $n$-form gauge theories. The solitons are singularities of the $n$-brane field, and we classify them using the homotopy theory of ${\mathbb{E}_n}$-algebras. We find that the classification of codimension ${k+1}$ topological solitons with ${k\geq n}$ can be understood using homotopy groups of $\mathcal{E}_n$. In particular, they are classified by ${\pi_{k-n}(\mathcal{E}_n)}$ when ${n>1}$ and by ${\pi_{k-n}(\mathcal{E}_n)}$ modulo a ${\pi_{1-n}(\mathcal{E}_n)}$ action when ${n=0}$ or ${1}$. However, for ${n>2}$, their classification goes beyond the homotopy groups of $\mathcal{E}_n$ when ${k< n}$, which we explore through examples. We compare this classification to $n$-form $\mathcal{E}_n$ gauge theory. We then apply this classification and consider an ${n}$-form symmetry described by the abelian group ${G^{(n)}}$ that is spontaneously broken to ${H^{(n)}\subset G^{(n)}}$, for which the order parameter characterizing this symmetry breaking pattern is an ${n}$-brane field with target space ${\mathcal{E}_n = G^{(n)}/H^{(n)}}$. We discuss this classification in the context of many examples, both with and without 't Hooft anomalies.

Quantum Scars and Caustics in Majorana Billiards. (arXiv:2312.13368v2 [cond-mat.mes-hall] UPDATED)
R. Johanna Zijderveld, A. Mert Bozkurt, Michael Wimmer, İnanç Adagideli

We demonstrate that the classical dynamics influence the localization behaviour of Majorana wavefunctions in Majorana billiards. By using a connection between Majorana wavefunctions and eigenfunctions of a normal state Hamiltonian, we show that Majorana wavefunctions in both p-wave and s-wave topological superconductors inherit the properties of the underlying normal state eigenfunctions. As an example, we demonstrate that Majorana wavefunctions in topological superconductors with chaotic shapes feature quantum scarring. Furthermore, we show a way to manipulate a localized Majorana wavefunction by altering the underlying classical dynamics using a local potential away from the localization region. Finally, in the presence of chiral symmetry breaking, we find that the Majorana wavefunction in convex-shaped Majorana billiards exhibits caustics formation, reminiscent of a normal state system with magnetic field.

Entanglement of edge modes in (very) strongly correlated topological insulators. (arXiv:2312.13598v2 [cond-mat.str-el] UPDATED)
Nisa Ara, Rudranil Basu, Emil Mathew, Indrakshi Raychowdhury

Identifying topological phases for a strongly correlated theory remains a non-trivial task, as defining order parameters, such as Berry phases, is not straightforward. Quantum information theory is capable of identifying topological phases for a theory that exhibits quantum phase transition with a suitable definition of order parameters that are related to different entanglement measures for the system. In this work, we study entanglement entropy for a bi-layer SSH model, both in the presence and absence of Hubbard interaction and at varying interaction strengths. For the free theory, edge entanglement acts as an order parameter, which is supported by analytic calculations and numerical (DMRG) studies. We calculate the symmetry-resolved entanglement and demonstrate the equipartition of entanglement for this model which itself acts as an order parameter when calculated for the edge modes. As the DMRG calculation allows one to go beyond the free theory, we study the entanglement structure of the edge modes in the presence of on-site Hubbard interaction for the same model. A sudden reduction of edge entanglement is obtained as interaction is switched on. The explanation for this lies in the change in the size of the degenerate subspaces in the presence and absence of interaction. We also study the signature of entanglement when the interaction strength becomes extremely strong and demonstrate that the edge entanglement remains protected. In this limit, the energy eigenstates essentially become a tensor product state, implying zero entanglement. However, a remnant entropy survives in the non-trivial topological phase which is exactly due to the entanglement of the edge modes.

Thermodynamics and dynamics of coupled complex SYK models. (arXiv:2312.14644v2 [hep-th] UPDATED)
Jan C. Louw, Linda M. van Manen, Rishabh Jha

It has been known that the large-$q$ complex SYK model falls under the same universality class as that of van der Waals (mean-field) and saturates the Maldacena-Shenker-Stanford bound, both features shared by various black holes. This makes the SYK model a useful tool in probing the fundamental nature of quantum chaos and holographic duality. This work establishes the robustness of this shared universality class and chaotic properties for SYK-like models by extending to a system of coupled large-$q$ complex SYK models of different orders. We provide a detailed derivation of thermodynamic properties, specifically the critical exponents for an observed phase transition, as well as dynamical properties, in particular the Lyapunov exponent, via the out-of-time correlator calculations. Our analysis reveals that, despite the introduction of an additional scaling parameter through interaction strength ratios, the system undergoes a continuous phase transition at low temperatures, similar to that of the single SYK model. The critical exponents align with the Landau-Ginzburg (mean-field) universality class, shared with van der Waals gases and various AdS black holes. Furthermore, we demonstrate that the coupled SYK system remains maximally chaotic in the large-$q$ limit at low temperatures, adhering to the Maldacena-Shenker-Stanford bound, a feature consistent with the single SYK model. These findings establish robustness and open avenues for broader inquiries into the universality and chaos in complex quantum systems. We conclude by considering the very low-temperature regime where there is again a maximally chaotic to regular (non-chaotic) phase transition. We then discuss relations with the Hawking-Page phase transition observed in the holographic dual black holes.

Optical probe on doping modulation of magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$. (arXiv:2312.16437v3 [cond-mat.mes-hall] UPDATED)
L. Wang, S. Zhang, B. B. Wang, B. X. Gao, L. Y. Cao, X. T. Zhang, X. Y. Zhang, E. K. Liu, R. Y. Chen

The magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$ is extensively investigated due to its giant anomalous Hall effect (AHE).Recent studies demonstrate that the AHE can be effectively tuned by multi-electron Ni doping.To reveal the underlying mechanism of this significant manipulation,it is crucial to explore the band structure modification caused by Ni doping. Here,we study the electrodynamics of both pristine and Ni-doped Co$_{3-x}$Ni$_x$Sn$_2$S$_2$ with $x=$0, 0.11 and 0.17 by infrared spectroscopy. We find that the inverted energy gap around the Fermi level($E_{F}$) gets smaller at $x=$0.11,which is supposed to enhance the Berry curvature and therefore increase the AHE.Then $E_{F}$ moves out of this gap at $x=$0.17. Additionally,the low temperature carrier density is demonstrated to increase monotonically upon doping,which is different from previous Hall measurement results. We also observe the evidences of band broadening and exotic changes of high-energy interband transitions caused by doping.Our results provide detailed information about the band structure of Co$_{3-x}$Ni$_x$Sn$_2$S$_2$ at different doping levels,which will help to guide further studies on the chemical tuning of AHE.

Many-body higher-order topological invariant for $C_n$-symmetric insulators. (arXiv:2401.00050v2 [cond-mat.str-el] UPDATED)
Ammar Jahin, Yuan-Ming Lu, Yuxuan Wang

Higher-order topological insulators in two spatial dimensions display fractional corner charges. While fractional charges in one dimension are known to be captured by a many-body bulk invariant, computed by the Resta formula, a many-body bulk invariant for higher-order topology and the corresponding fractional corner charges remains elusive despite several attempts. Inspired by recent work by Tada and Oshikawa, we propose a well-defined many-body bulk invariant for $C_n$ symmetric higher-order topological insulators, which is valid for both non-interacting and interacting systems. Instead of relating them to the bulk quadrupole moment as was previously done, we show that in the presence of $C_n$ rotational symmetry, this bulk invariant can be directly identified with quantized fractional corner charges. In particular, we prove that the corner charge is quantized as $e/n$ with $C_n$ symmetry, leading to a $\mathbb{Z}_n$ classification for higher-order topological insulators in two dimensions.

Found 5 papers in prb
Date of feed: Tue, 09 Jan 2024 04:16:58 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)

Tunable domain-wall skyrmion Hall effect driven by a current and a magnetic field
Seon Uk Han, Wooyon Kim, Se Kwon Kim, and Soong-Geun Je
Author(s): Seon Uk Han, Wooyon Kim, Se Kwon Kim, and Soong-Geun Je

An extended domain wall (DW) in the presence of the Dzyaloshinskii-Moriya interaction can harbor a nontrivial spin texture inside it, which is called the DW skyrmion due to its topological equivalence to skyrmions in chiral magnets. In this study we develop a theory for the dynamics of the DW skyrmi…

[Phys. Rev. B 109, 014404] Published Mon Jan 08, 2024

Effects of the spin-orbit interaction on the optical properties of ${\mathrm{ReS}}_{2}$ and ${\mathrm{ReSe}}_{2}$
Thorsten Deilmann
Author(s): Thorsten Deilmann

${\mathrm{ReS}}_{2}$ and ${\mathrm{ReSe}}_{2}$ are less frequently studied transition metal dichalcogenides. They appear in the $1{T}^{′}$ phase with a significantly reduced symmetry compared with, for example, ${\mathrm{MoS}}_{2}$, while inversion symmetry is preserved. Several broad peaks have bee…

[Phys. Rev. B 109, 035111] Published Mon Jan 08, 2024

Metastable charge distribution between degenerate Landau levels
Wenlu Lin, Xing Fan, Lili Zhao, Yoon Jang Chung, Adbhut Gupta, Kirk W. Baldwin, Loren Pfeiffer, Hong Lu, and Yang Liu
Author(s): Wenlu Lin, Xing Fan, Lili Zhao, Yoon Jang Chung, Adbhut Gupta, Kirk W. Baldwin, Loren Pfeiffer, Hong Lu, and Yang Liu

We study two-dimensional electron systems confined in wide quantum wells whose subband separation is comparable with the Zeeman energy. Two $N=0$ Landau levels from different subbands and with opposite spins are pinned in energy when they cross each other and electrons can freely transfer between th…

[Phys. Rev. B 109, 035305] Published Mon Jan 08, 2024

Observation of Dirac nodal line states in topological semimetal candidate PrSbTe
Dengpeng Yuan, Dajian Huang, Xin Ma, Xu Chen, Huifen Ren, Yun Zhang, Wei Feng, Xiegang Zhu, Bo Wang, Xuwen He, Jian Wu, Shiyong Tan, Qunqing Hao, Qiang Zhang, Yi Liu, Qin Liu, Zhengtai Liu, Chao Cao, Qiuyun Chen, and Xinchun Lai
Author(s): Dengpeng Yuan, Dajian Huang, Xin Ma, Xu Chen, Huifen Ren, Yun Zhang, Wei Feng, Xiegang Zhu, Bo Wang, Xuwen He, Jian Wu, Shiyong Tan, Qunqing Hao, Qiang Zhang, Yi Liu, Qin Liu, Zhengtai Liu, Chao Cao, Qiuyun Chen, and Xinchun Lai

The interplay among topology, crystal symmetry, magnetic order, and strong electron correlation can give rise to a plethora of exotic physical phenomena. The ZrSiS family is known as typical topological Dirac semimetals, among them $\mathit{Ln}\mathrm{SbTe}$ ($\mathit{Ln}$ denotes lanthanide) compou…

[Phys. Rev. B 109, 045113] Published Mon Jan 08, 2024

Majorana zero modes in twisted transition metal dichalcogenide homobilayers
Xun-Jiang Luo, Wen-Xuan Qiu, and Fengcheng Wu
Author(s): Xun-Jiang Luo, Wen-Xuan Qiu, and Fengcheng Wu

Semiconductor moiré superlattices provide a highly tunable platform to study the interplay between electron correlation and band topology. For example, the generalized Kane-Mele-Hubbard model can be simulated by topological moiré flat bands in twisted transition metal dichalcogenide homobilayers. In…

[Phys. Rev. B 109, L041103] Published Mon Jan 08, 2024

Found 3 papers in prl
Date of feed: Tue, 09 Jan 2024 04:16:56 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)

Quantum Scars and Regular Eigenstates in a Chaotic Spinor Condensate
Bertrand Evrard, Andrea Pizzi, Simeon I. Mistakidis, and Ceren B. Dag
Author(s): Bertrand Evrard, Andrea Pizzi, Simeon I. Mistakidis, and Ceren B. Dag

Quantum many-body scars consist of a few low-entropy eigenstates in an otherwise chaotic many-body spectrum, and can weakly break ergodicity resulting in robust oscillatory dynamics. The notion of quantum many-body scars follows the original single-particle scars introduced within the context of qua…

[Phys. Rev. Lett. 132, 020401] Published Mon Jan 08, 2024

Demonstrating Path-Independent Anyonic Braiding on a Modular Superconducting Quantum Processor
Jingjing Niu, Yishan Li, Libo Zhang, Jiajian Zhang, Ji Chu, Jiaxiang Huang, Wenhui Huang, Lifu Nie, Jiawei Qiu, Xuandong Sun, Ziyu Tao, Weiwei Wei, Jiawei Zhang, Yuxuan Zhou, Yuanzhen Chen, Ling Hu, Yang Liu, Song Liu, Youpeng Zhong, Dawei Lu, and Dapeng Yu
Author(s): Jingjing Niu, Yishan Li, Libo Zhang, Jiajian Zhang, Ji Chu, Jiaxiang Huang, Wenhui Huang, Lifu Nie, Jiawei Qiu, Xuandong Sun, Ziyu Tao, Weiwei Wei, Jiawei Zhang, Yuxuan Zhou, Yuanzhen Chen, Ling Hu, Yang Liu, Song Liu, Youpeng Zhong, Dawei Lu, and Dapeng Yu

Anyons, exotic quasiparticles in two-dimensional space exhibiting nontrivial exchange statistics, play a crucial role in universal topological quantum computing. One notable proposal to manifest the fractional statistics of anyons is the toric code model; however, scaling up its size through quantum…

[Phys. Rev. Lett. 132, 020601] Published Mon Jan 08, 2024

Macroscopic Quantum Superpositions via Dynamics in a Wide Double-Well Potential
M. Roda-Llordes, A. Riera-Campeny, D. Candoli, P. T. Grochowski, and O. Romero-Isart
Author(s): M. Roda-Llordes, A. Riera-Campeny, D. Candoli, P. T. Grochowski, and O. Romero-Isart

We present an experimental proposal for the rapid preparation of the center of mass of a levitated particle in a macroscopic quantum state, that is a state delocalized over a length scale much larger than its zero-point motion and that has no classical analog. This state is prepared by letting the p…

[Phys. Rev. Lett. 132, 023601] Published Mon Jan 08, 2024

Found 4 papers in pr_res
Date of feed: Tue, 09 Jan 2024 04:16:56 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)

Magnon-magnon coupling mediated by topological edge states
H. Pan, Z. H. An, and C.-M. Hu
Author(s): H. Pan, Z. H. An, and C.-M. Hu

The topology of the photonic bath shows excellent potential to engineer the intriguing interaction properties between light and matter. Here, we study the dielectric resonator array with a zigzag geometry, an analogy of the Su-Schrieffer-Heeger model equipped with peculiar freedom to manipulate the …

[Phys. Rev. Research 6, 013020] Published Mon Jan 08, 2024

Simulation and performance analysis of quantum error correction with a rotated surface code under a realistic noise model
Mitsuki Katsuda, Kosuke Mitarai, and Keisuke Fujii
Author(s): Mitsuki Katsuda, Kosuke Mitarai, and Keisuke Fujii

The demonstration of quantum error correction (QEC) is one of the most important milestones in the realization of fully-fledged quantum computers. Toward this, QEC experiments using the surface codes have recently been actively conducted. However, it has not yet been realized to protect logical quan…

[Phys. Rev. Research 6, 013024] Published Mon Jan 08, 2024

Spin and charge fluctuation induced pairing in ABCB tetralayer graphene
Ammon Fischer, Lennart Klebl, Jonas B. Hauck, Alexander Rothstein, Lutz Waldecker, Bernd Beschoten, Tim O. Wehling, and Dante M. Kennes
Author(s): Ammon Fischer, Lennart Klebl, Jonas B. Hauck, Alexander Rothstein, Lutz Waldecker, Bernd Beschoten, Tim O. Wehling, and Dante M. Kennes

ABCB tetralayer graphene features valley-local flat bands and van Hove singularities due to intrinsic crystal fields. This strengthens a variety of correlated states including ferri- and ferromagnetic and superconducting phases at low densities.

[Phys. Rev. Research 6, L012003] Published Mon Jan 08, 2024

Role of isotopes in microturbulence from linear to saturated Ohmic confinement regimes
Lei Qi, Jae-Min Kwon, T. S. Hahm, M. Leconte, Sumin Yi, Y. W. Cho, and Janghoon Seo
Author(s): Lei Qi, Jae-Min Kwon, T. S. Hahm, M. Leconte, Sumin Yi, Y. W. Cho, and Janghoon Seo

The first-principle bounce-average gyrokinetic numerical experiments investigating the isotopic dependence of energy confinement achieve a quantitative agreement with experimental empirical scaling laws in tokamak magnetic confined fusion plasmas. Mitigation of turbulence radial electric field intensity |δEr|2 and associated poloidal δ𝗘 × 𝗕 fluctuating velocity with the turbulence radial correlation length lcr Mi0.11 strongly deviating from the gyro-Bohm scaling is identified as the principal mechanism, along with zonal flow and trapped electron turbulence stabilization, contributing to the isotope effects in tokamak plasmas.

[Phys. Rev. Research 6, L012004] Published Mon Jan 08, 2024

Found 2 papers in nano-lett
Date of feed: Tue, 09 Jan 2024 02:33:21 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] Electronic Structure of Isolated Graphene Nanoribbons in Solution Revealed by Two-Dimensional Electronic Spectroscopy
Tetsuhiko Nagahara, Franco V. A. Camargo, Fugui Xu, Lucia Ganzer, Mattia Russo, Pengfei Zhang, Antonio Perri, Gabriel de la Cruz Valbuena, Ismael A. Heisler, Cosimo D’Andrea, Dario Polli, Klaus Müllen, Xinliang Feng, Yiyong Mai, and Giulio Cerullo

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02665

[ASAP] Magneto-optical Effects of an Artificially Layered Ferromagnetic Topological Insulator with a TC of 160 K
Xingyue Han, Hee Taek Yi, Seongshik Oh, and Liang Wu

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04103

Found 1 papers in acs-nano
Date of feed: Tue, 09 Jan 2024 02:51:53 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] Hierarchical Spatial Confinement Unlocking the Storage Limit of MoS2 for Flexible High-Energy Supercapacitors
Ling Kang, Shude Liu, Qia Zhang, Jianxiong Zou, Jin Ai, Donghong Qiao, Wenda Zhong, Yuxiang Liu, Seong Chan Jun, Yusuke Yamauchi, and Jian Zhang

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ACS Nano
DOI: 10.1021/acsnano.3c09386