Found 37 papers in cond-mat
Date of feed: Wed, 24 Jan 2024 01:30:00 GMT

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Non-invertible symmetries and LSM-type constraints on a tensor product Hilbert space. (arXiv:2401.12281v1 [cond-mat.str-el])
Nathan Seiberg, Sahand Seifnashri, Shu-Heng Shao

We discuss the exact non-invertible Kramers-Wannier symmetry of 1+1d lattice models on a tensor product Hilbert space of qubits. This symmetry is associated with a topological defect and a conserved operator, and the latter can be presented as a matrix product operator. Importantly, unlike its continuum counterpart, the symmetry algebra involves lattice translations. Consequently, it is not described by a fusion category. We present a clear notion of an anomaly involving this non-invertible symmetry, parity/time-reversal symmetries, and lattice translations. Different Hamiltonians with the same lattice non-invertible symmetry can flow in their continuum limits to infinitely many different fusion categories (with different Frobenius-Schur indicators), including, as a special case, the Ising CFT. The non-invertible symmetry leads to a constraint similar to that of Lieb-Schultz-Mattis, implying that the system cannot have a unique gapped ground state. It is either in a gapless phase or in a gapped phase with three (or a multiple of three) ground states, associated with the spontaneous breaking of the lattice non-invertible symmetry.

Tunable interplay between light and heavy electrons in twisted trilayer graphene. (arXiv:2401.12284v1 [cond-mat.mes-hall])
Andrew T. Pierce, Yonglong Xie, Jeong Min Park, Zhuozhen Cai, Kenji Watanabe, Takashi Taniguchi, Pablo Jarillo-Herrero, Amir Yacoby

In strongly interacting systems with multiple energy bands, the interplay between electrons with different effective masses and the enlarged Hilbert space drives intricate correlated phenomena that do not occur in single-band systems. Recently, magic-angle twisted trilayer graphene (MATTG) has emerged as a promising tunable platform for such investigations: the system hosts both slowly dispersing, "heavy" electrons inhabiting its flat bands as well as delocalized "light" bands that disperse as free Dirac fermions. Most remarkably, superconductivity in twisted trilayer graphene and multilayer analogues with additional dispersive bands exhibits Pauli limit violation and spans a wider range of phase space compared to that in twisted bilayer graphene, where the dispersive bands are absent. This suggests that the interactions between different bands may play a fundamental role in stabilizing correlated phases in twisted graphene multilayers. Here, we elucidate the interplay between the light and heavy electrons in MATTG as a function of doping and magnetic field by performing local compressibility measurements with a scanning single-electron-transistor microscope. We establish that commonly observed resistive features near moir\'e band fillings $\nu$=-2, 1, 2 and 3 host a finite population of light Dirac electrons at the Fermi level despite a gap opening in the flat band sector. At higher magnetic field and near charge neutrality, we discover a new type of phase transition sequence that is robust over nearly 10 micrometers but exhibits complex spatial dependence. Mean-field calculations establish that these transitions arise from the competing population of the two subsystems and that the Dirac sector can be viewed as a new flavor analogous to the spin and valley degrees of freedom.

Theory of momentum-resolved magnon electron energy loss spectra: The case of Yttrium Iron Garnet. (arXiv:2401.12302v1 [cond-mat.mtrl-sci])
Julio A. do Nascimento, Phil J. Hasnip, S. A. Cavill, Fabrizio Cossu, Demie Kepaptsoglou, Quentin M. Ramasse, Adam Kerrigan, Vlado K. Lazarov

We explore the inelastic spectra of electrons impinging in a magnetic system. The methodology here presented is intended to highlight the charge-dependent interaction of the electron beam in a STEM-EELS experiment, and the local vector potential generated by the magnetic lattice. This interaction shows an intensity $10^{-2}$ smaller than the purely spin interaction, which is taken to be functionally the same as in the inelastic neutron experiment. On the other hand, it shows a strong scattering vector dependence ($\kappa^{-4}$) and a dependence with the relative orientation between the probe wavevector and the local magnetic moments of the solid. We present YIG as a case study due to its high interest by the community.

Magnetic and Lattice Ordered Fractional Quantum Hall Phases in Graphene. (arXiv:2401.12357v1 [cond-mat.mes-hall])
Jincheng An, Ajit C. Balram, Ganpathy Murthy

At and near charge neutrality, monolayer graphene in a perpendicular magnetic field is a quantum Hall ferromagnet. In addition to the highly symmetric Coulomb interaction, residual lattice-scale interactions, Zeeman, and sublattice couplings determine the fate of the ground state. Going beyond the simplest model with ultra-short-range residual couplings to more generic couplings, one finds integer phases that show the coexistence of magnetic and lattice order parameters. Here we show that fractional quantum Hall states in the vicinity of charge neutrality have even richer phase diagrams, with a plethora of phases with simultaneous magnetic and lattice symmetry breaking.

The Crossover from Ordinary to Higher-Order van Hove Singularity in a Honeycomb System: A Parquet Renormalization Group Analysis. (arXiv:2401.12384v1 [cond-mat.str-el])
Yueh-Chen Lee, Dmitry V. Chichinadze, Andrey V. Chubukov

We investigate the crossover from an ordinary van Hove singularity (OVHS) to a higher order van Hove singularity (HOVHS) in a model applicable to Bernal bilayer graphene and rhombohedral trilayer graphene in a displacement field. At small doping, these systems possess three spin-degenerate Fermi pockets near each Dirac point $K$ and $K'$; at larger doping, the three pockets merge into a single one. The transition is of Lifshitz type and includes van Hove singularities. Depending on system parameters, there are either 3 separate OVHS or a single HOVHS. We model this behavior by a one-parameter dispersion relation, which interpolates between OVHS and HOVHS. In each case, the diverging density of states triggers various electronic orders (superconductivity, pair density wave, valley polarization, ferromagnetism, spin and charge density wave). We apply the parquet renormalization group (pRG) technique and analyze how the ordering tendencies evolve between OVHS and HOVHS. We report rich system behavior caused by disappearance/reemergence and pair production/annihilation of the fixed points of the pRG flow.

Two-dimensional silk. (arXiv:2401.12400v1 [cond-mat.mtrl-sci])
Chenyang Shi, Marlo Zorman, Xiao Zhao, Miquel B. Salmeron, Jim Pfaendtner, Xiang Yang Liu, Shuai Zhang, James De Yoreo

The ability to form silk films on semiconductors, metals, and oxides or as free-standing membranes has motivated research into silk-based electronic, optical, and biomedical devices. However, the inherent disorder of native silk limits device performance. Here we report the creation of highly ordered two-dimensional (2D) silk fibroin (SF) layers on van der Waals solids. Using in situ atomic force microscopy, synchrotron-based infrared spectroscopy, and molecular dynamics simulations, we develop a mechanistic understanding of the assembly process. We show that the films consist of lamellae having an epitaxial relationship with the underlying lattice and that the SF molecules exhibit the same Beta-sheet secondary structure seen in the crystallites of the native form. By increasing the SF concentration, multilayer films form via layer-by-layer growth, either along a classical pathway in which SF molecules assemble directly into the lamellae or, at sufficiently high concentrations, along a two-step pathway beginning with formation of a disordered monolayer that subsequently converts into the crystalline phase. Kelvin probe measurements show that these 2D SF layers substantially alter the surface potential. Moreover, the ability to assemble 2D silk on both graphite and MoS2 suggests that it may provide a general platform for silk-based electronics on vdW solids.

Topological magnons in a non-coplanar magnetic order on the triangular lattice. (arXiv:2401.12505v1 [cond-mat.str-el])
Linli Bai, Ken Chen

The bond-dependent Kitaev interaction $K$ is familiar in the effective spin model of transition metal compounds with octahedral ligands. In this work, we find a peculiar non-coplanar magnetic order can be formed with the help of $K$ and next nearest neighbor Heisenberg coupling $J_2$ on triangular lattice. It can be seen as a miniature version of skyrmion lattice, since it has nine spins and integer topological number in a magnetic unit cell. The magnon excitations in such an order is studied by the linear spin-wave theory. Of note is that the change in the relative size of $J_2$ and $K$ will produce topological magnon phase transitions although the topological number remains unchanged. We also calculated the experimentally observable thermal Hall conductivity, and found that the signs of thermal Hall conductivity will change with topological phase transitions or temperature changes in certain regions.

Revisiting magnetic exchange interactions in transition metal doped Bi$_2$Se$_3$ using DFT+MFT. (arXiv:2401.12514v1 [cond-mat.mtrl-sci])
Sagar Sarkar, Shivalika Sharma, Igor Di Marco

Topological insulators doped with magnetic impurities has become a promising candidate for Quantum Anomalous Hall Effect (QAHE) in the dilute doping limit. The crucial factor in realizing the QAHE in these systems is the spontaneous Ferromagnetic (FM) ordering between the doped magnetic atoms. Hence, understanding the magnetic exchange interaction between the magnetic atoms becomes essential. In this work, we use the Density functional theory (DFT) and Magnetic force theorem (MFT) to calculate the magnetic exchange interaction between magnetic impurities (V, Cr, Mn, Fe) in the host Bi2Se3. Through an orbital decomposition of the calculated exchange, we can identify the nature and origin of the exchange mechanism that depends on the type of magnetic atoms, doping concentration, host material etc. Our results show that Cr doping results in an insulating state, a prerequisite for the QAHE, that remains robust against doping concentration and local correlation. In this case, the short-ranged superexchange and long-ranged exchange via the p-orbitals of the host results in an FM order. For other doped systems (V, Mn and Fe doped), their electronic configuration and local octahedral environment open the possibility of finite carrier density at the Fermi energy. Depending on the type of this carrier (electron/hole) and their localized/delocalized nature, a short-ranged double exchange / long-ranged RKKY mechanism could occur between the magnetic atoms.

Landau-Level Mixing and SU(4) Symmetry Breaking in Graphene. (arXiv:2401.12528v1 [cond-mat.mes-hall])
Nemin Wei, Guopeng Xu, Inti Sodemann Villadiego, Chunli Huang

Recent scanning tunneling microscopy experiments on graphene at charge neutrality under strong magnetic fields have uncovered a ground state characterized by Kekul\'e distortion (KD). In contrast, non-local spin and charge transport experiments in double-encapsulated graphene, which has a higher dielectric constant, have identified an antiferromagnetic (AF) ground state. We propose a mechanism to reconcile these conflicting observations, by showing that Landau-level mixing can drive a transition from AF to KD with the reduction of the dielectric screening. Our conclusion is drawn from studying the effect of Landau-level mixing on the lattice-scale, valley-dependent interactions to leading order in graphene's fine structure constant $\kappa = e^2/(\hbar v_F \epsilon)$. This analysis provides three key insights: 1) Valley-dependent interactions remain predominantly short-range with the $m=0$ Haldane pseudopotential being at least an order of magnitude greater than the others, affirming the validity of delta-function approximation for these interactions. 2) The phase transition between the AF and KD states is driven by the microscopic process in the double-exchange Feynman diagram. 3) The magnitudes of the coupling constants are significantly boosted by remote Landau levels. Our model also provides a theoretical basis for numerical studies of fractional quantum Hall states in graphene.

Non-Bloch Theory for Spatiotemporal Photonic Crystals Assisted by Continuum Effective Medium. (arXiv:2401.12536v1 [physics.optics])
Haozhi Ding, Kun Ding

As one indispensable type of nonreciprocal mechanism, a system with temporal modulations is intrinsically open in the physical sense and inevitably non-Hermitian, but the space and time degrees of freedom are nonseparable in a large variety of circumstances, which restrains the non-Bloch band theory to apply. Here, we investigate the spatially photonic crystals (PhCs) composed of spatiotemporal modulation materials (STMs) and homogeneous media, dubbed as the STM-PhC, wherein the spatial and temporal modulations are deliberately designed to be correlated. To bypass the difficulty of the spatiotemporal correlation, we first employ the effective medium theory to account for the dispersion of fundamental bands under the influence of Floquet sidebands. Based on the dynamical degeneracy splitting viewpoint and continuum generalized Brillouin zone condition, we then analytically give the criteria for the existence of the non-Hermitian skin effect in the STM. Assisted by developing a numerical method that embeds the plane wave expansion in the transfer matrix, we establish the non-Bloch band theory for the low-frequency Floquet bands in the STM-PhCs, in which the central is the identification of the generalized Brillouin zone. We finally delve into the topological properties, including non-Bloch Zak phases and delocalization of topologically edge states. Our work validates that effective medium assists the non-Bloch band theory applied to the STM-PhCs, which delivers a prescription to broaden the horizons of non-Bloch theory.

Dynamics of quantum discommensurations in the Frenkel-Kontorova chain. (arXiv:2401.12614v1 [cond-mat.stat-mech])
Oksana Chelpanova, Shane P. Kelly, Ferdinand Schmidt-Kaler, Giovanna Morigi, Jamir Marino

The ability for real-time control of topological defects can open up prospects for dynamical manipulation of macroscopic properties of solids. A sub-category of these defects, formed by particle dislocations, can be effectively described using the Frenkel-Kontorova chain, which characterizes the dynamics of these particles in a periodic lattice potential. This model is known to host solitons, which are the topological defects of the system and are linked to structural transitions in the chain. This work addresses three key questions: Firstly, we investigate how imperfections present in concrete implementations of the model affect the properties of topological defects. Secondly, we explore how solitons can be injected after the rapid change in lattice potential or nucleated due to quantum fluctuations. Finally, we analyze the propagation and scattering of solitons, examining the role of quantum fluctuations and imperfections in influencing these processes. Furthermore, we address the experimental implementation of the Frenkel-Kontorova model. Focusing on the trapped ion quantum simulator, we set the stage for controllable dynamics of topological excitations and their observation in this platform.

Spectra and pseudo-spectra of tridiagonal $k$-Toeplitz matrices and the topological origin of the non-Hermitian skin effect. (arXiv:2401.12626v1 [math-ph])
Habib Ammari, Silvio Barandun, Yannick De Bruijn, Ping Liu, Clemens Thalhammer

We establish new results on the spectra and pseudo-spectra of tridiagonal $k$-Toeplitz operators and matrices. In particular, we prove the connection between the winding number of the eigenvalues of the symbol function and the exponential decay of the associated eigenvectors (or pseudo-eigenvectors). Our results elucidate the topological origin of the non-Hermitian skin effect in general one-dimensional polymer systems of subwavelength resonators with imaginary gauge potentials, proving the observation and conjecture in arXiv:2307.13551. We also numerically verify our theory for these systems.

Non-Reciprocal Interactions Reshape Topological Defect Annihilation. (arXiv:2401.12637v1 [cond-mat.stat-mech])
Ylann Rouzaire, Demian Levis, Ignacio Pagonabarraga

We show how non-reciprocal ferromagnetic interactions between neighbouring planar spins in two dimensions, affects the behaviour of topological defects. Non-reciprocity is introduced by weighting the coupling strength of the two-dimensional XY model by an anisotropic kernel. As a consequence, in addition to the topological charge $q$, the actual shape (or phase) of the defects becomes crucial to faithfully describe their dynamics. Non-reciprocal coupling twists the spin field, selecting specific defect shapes, dramatically altering the pair annihilation process. Defect annihilation can either be enhanced or hindered, depending on the shape of the defects concerned and the degree of non-reciprocity in the system.

Chern numbers in two-dimensional systems with spiral boundary conditions. (arXiv:2401.12674v1 [cond-mat.str-el])
Masaaki Nakamura, Shohei Masuda

We discuss methods for calculating Chern numbers of two-dimensional lattice systems using spiral boundary conditions, which sweep all lattice sites in one-dimensional order. Specifically, we establish the one-dimensional representation of Fukui-Hatsugai-Suzuki's method, based on lattice gauge theory, and the Coh-Vanderbilt's method, which relates to electronic polarization. The essential point of this discussion is that the insertion of flux into the extended one-dimensional chain generates an effective current in the perpendicular direction. These methods are valuable not only for a unified understanding of topological physics in different dimensions but also for numerical calculations, including the density matrix renormalization group.

Optical Snake States in Photonic Graphene. (arXiv:2401.12695v1 [cond-mat.mes-hall])
O.M. Bahrova, S.V. Koniakhin, A.V. Nalitov, E.D. Cherotchenko

We propose an optical analogue of electron snake states based on artificial gauge magnetic field in photonic graphene with effective strain implemented by varying distance between pillars. We develop an intuitive and exhaustive continuous model based on tight-binding approximation and compare it with numerical simulations of a realistic photonic structure. The allowed lateral propagation direction is shown to be strongly coupled to the valley degree of freedom and the proposed photonic structure may be used a valley filter.

Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice. (arXiv:2401.12702v1 [physics.optics])
Javier Rodriguez Alvarez, Amilcar Labarta, Juan Carlos Idrobo, Rossana Dell Anna, Alessandro Cian, Damiano Giubertoni, Xavier Borrise, Albert Guerrero, Francesc Perez Murano, Arantxa Fraile Rodriguez, Xavier Batlle

Plasmonic lattice nanostructures are of technological interest because of their capacity to manipulate light below the diffraction limit. Here, we present a detailed study of dark and bright modes in the visible and near-infrared energy regime of an inverted plasmonic honeycomb lattice by a combination of Au+ focused ion beam lithography with nanometric resolution, optical and electron spectroscopy, and finite-difference time-domain simulations. The lattice consists of slits carved in a gold thin film, exhibiting hotspots and a set of bright and dark modes. We proposed that some of the dark modes detected by electron energy-loss spectroscopy are caused by antiferroelectric arrangements of the slit polarizations with two times the size of the hexagonal unit cell. The plasmonic resonances take place within the 0.5_2 eV energy range, indicating that they could be suitable for a synergistic coupling with excitons in two-dimensional transition metal dichalcogenides materials or for designing nanoscale sensing platforms based on near-field enhancement over a metallic surface.

Curvature effect induce topological phase transitions in two dimensional topological superconductor. (arXiv:2401.12705v1 [cond-mat.supr-con])
Huan-Wen Lai, Meng-Chien Wang, Ching-Ray Chang, Seng-Ghee Tan

Recently, topological superconductor is one of the important topics in condensed matter physics due to the exotic features of quasiparticles resided on the edge, surface and vortex core. In our work, we analyze the two dimensional s+p wave noncentrosymmetric superconductor(NCS) with Rashba spin-orbit coupling in 2D cylindrical coordinate to find the relationship between the topological phase transition and the curvature. With analytical calculation and numerical analyze, we confirm that the topological phase transition in s+p wave NCS in 2D cylindrical coordinate is related to the curvature from band theory perspective.

Microscopic theory of field tuned topological transitions in the Kitaev honeycomb model. (arXiv:2401.12750v1 [cond-mat.str-el])
Jagannath Das, Vikram Tripathi

We microscopically derive a lattice abelian mutual Chern-Simons gauge theory for a honeycomb Kitaev model subjected to $(001)$ Zeeman and three-spin scalar spin chirality perturbations. We identify the nature of topological orders, emergent excitations and ground state degeneracy (GSD), topological entanglement entropy ($\gamma$), and chiral central charge ($c$) in different field regimes for both ferromagnetic (FM) and antiferromagnetic (AFM) sign of the Kitaev interaction. A nonabelian Ising topological order (ITO) exists at low fields in both cases, with $\gamma=\ln 2,$ $c=1/2,$ and GSD$=3,$ where the nonabelian anyon, a twist defect, is an intrinsic bulk excitation. For AFM Kitaev interactions, further increase of the field causes a transition from ITO to an intermediate trivial topological phase with central charge $c=1/2,$ implying half-quantized thermal Hall response in both phases with no change of sign. At sufficiently high fields there is a first order transition to a polarized paramagnetic phase with $\gamma=c=0.$ For the FM case, there is a direct transition from ITO to the polarized phase.

Electronic transport properties of few-layer graphene. (arXiv:2401.12804v1 [cond-mat.mes-hall])
Biswajit Datta

In this thesis we will focus on a particular variant of few-layer graphene -- ABA-stacked trilayer graphene. Bernal (ABA) stacked trilayer graphene (TLG) is a multiband system consisting of a pair of Dirac-like massless linear bands and a pair of massive quadratic bands. We have studied the electronic properties of this system in detail and unfolded many interesting physics problems. The whole thesis is structured in the following way. In chapter 2 and chapter 3 we discuss the theoretical ingredients we will need to understand the experimental data presented in this thesis. Chapter 2 focuses on the band structure of graphene and few-layer graphene. In chapter 3 we focus on quantum Hall effect of graphene and few-layer graphene. In chapter 4 we discuss the device fabrication and characterization. Chapter 5, Chapter 6 and Chapter 7 present the original works which are published as papers.

Diagnosing $SO(5)$ Symmetry and First-Order Transition in the $J-Q_3$ Model via Entanglement Entropy. (arXiv:2401.12838v1 [cond-mat.str-el])
Zehui Deng, Lu Liu, Wenan Guo, Hai-qing Lin

We study the scaling behavior of the R\'enyi entanglement entropy with smooth boundaries at the phase transition point of the two-dimensional $J-Q_3$ model. Using the recently developed scaling formula [Deng {\it et al.}, Phys. Rev. B {\textbf{108}, 125144 (2023)}], we find a subleading logarithmic term with a coefficient showing that the number of Goldstone modes is four, indicating the existence of the spontaneous symmetry breaking from an emergent $SO(5)$ to $O(4)$ in the thermodynamic limit, but restored in a finite size. This result shows that the believed deconfined quantum critical point of the $J-Q_{3}$ model is a weak first-order transition point. Our work provides a new way to distinguish a state with spontaneously broken continuous symmetry from a critical state. The method is particularly useful in identifying weak first-order phase transitions, which are hard to determine using conventional methods.

Observation of topologically protected compact edge states in flux-dressed graphene photonic lattices. (arXiv:2401.12949v1 [cond-mat.mes-hall])
Gabriel Cáceres-Aravena, Milica Nedić, Paloma Vildoso, Goran Gligorić, Jovana Petrovic, Rodrigo A. Vicencio, Aleksandra Maluckov

Systems with engineered flatband spectra are a postulate of high-capacity transmission links and a candidate for high-temperature superconductivity. However, their operation relies on the edge or surface modes susceptible to fluctuations and fabrication errors. While the mode robustness can be enhanced by a combination of Aharonov-Bohm caging and topological insulation, the design of the corresponding flatbands requires approaches beyond the standard $k$-vector-based methods. Here, we propose a synthetic-flux probe as a solution to this problem and a route to the realization of ultra-stable modes. We prove the concept in a laser-fabricated graphene-like ribbon photonic lattice with the band-flattening flux induced by "P" waveguide coupling. The topological non-triviality is witnessed by an integer Zak phase derived from the mean chiral displacement. Mode stability is evidenced by excellent mode localization and the robustness to fabrication tolerances and variations of the input phase. Our results can serve as a basis for the development of multi-flat-band materials for low-energy electronics.

Hawking radiation on the lattice from Floquet and local Hamiltonian quench dynamics. (arXiv:2204.06583v3 [quant-ph] UPDATED)
Daan Maertens, Nick Bultinck, Karel Van Acoleyen

We construct two free fermion lattice models exhibiting Hawking pair creation. Specifically, we consider the simplest case of a d=1+1 massless Dirac fermion, for which the Hawking effect can be understood in terms of a quench of the uniform vacuum state with a non-uniform Hamiltonian that interfaces modes with opposite chirality. For both our models we find that additional modes arising from the lattice discretization play a crucial role, as they provide the bulk reservoir for the Hawking radiation: the Hawking pairs emerge from fermions deep inside the Fermi sea scattering off the effective black hole horizon. Our first model combines local hopping dynamics with a translation over one lattice site, and we find the resulting Floquet dynamics to realize a causal horizon, with fermions scattering from the region outside the horizon. For our second model, which relies on a purely local hopping Hamiltonian, we find the fermions to scatter from the inside. In both cases, for Hawking temperatures up to the inverse lattice spacing we numerically find the resulting Hawking spectrum to be in perfect agreement with the Fermi-Dirac quantum field theory prediction.

Electron transport in a weakly disordered Weyl semimetal. (arXiv:2205.11565v2 [cond-mat.dis-nn] UPDATED)
M. E. Ismagambetov, P. M. Ostrovsky

Weyl semimetal is a solid material with isolated touching points between conduction and valence bands in its Brillouin zone -- Weyl points. Low energy excitations near these points exhibit a linear dispersion and act as relativistic massless particles. Weyl points are stable topological objects robust with respect to most perturbations. We study effects of weak disorder on the spectral and transport properties of Weyl semimetals in the limit of low energies. We use a model of Gaussian white-noise potential and apply dimensional regularization scheme near three dimensions to treat divergent terms in the perturbation theory. In the framework of self-consistent Born approximation, we find closed expressions for the average density of states and conductivity. Both quantities are analytic functions in the limit of zero energy. We also include interference terms beyond the self-consistent Born approximation up to the third order in the disorder strength. These interference corrections are stronger than the mean-field result and non-analytic as functions of energy. Our main result is the dependence of conductivity (in units $e^2/h$) on the electron concentration $\sigma = \sigma_0 - 0.891\, n^{1/3} + 0.115\, (n^{2/3}/\sigma_0) \ln|n|$.

Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels. (arXiv:2302.10982v2 [cond-mat.mes-hall] UPDATED)
Declan Burke, Dennis Heffels, Kristof Moors, Peter Schüffelgen, Detlev Grützmacher, Malcolm R. Connolly

Magnetic topological insulators in the quantum anomalous Hall regime host ballistic chiral edge channels. When proximitized by an $s$-wave superconductor, these edge states offer the potential for realizing topological superconductivity and Majorana bound states without the detrimental effect of large externally-applied magnetic fields on superconductivity. Realizing well-separated unpaired Majorana bound states requires magnetic topological insulator ribbons with a width of the order of the transverse extent of the edge state, however, which is expected to bring the required ribbon width down to around 100 nm. In this regime, it is known to be extremely difficult to retain the ballistic nature of chiral edge channels and realize a quantized Hall conductance. In this paper, we study the impact of disorder in such magnetic topological insulator nanoribbons and compare the fragility of ballistic chiral edge channels with the stability of Majorana bound states when the ribbon is covered by a superconducting film. We find that the Majorana bound states exhibit greater robustness against disorder than the underlying chiral edge channels.

Topological Monomodes in non-Hermitian Systems. (arXiv:2304.05748v3 [cond-mat.mes-hall] UPDATED)
E. Slootman, W. Cherifi, L. Eek, R. Arouca, E. J. Bergholtz, M. Bourennane, C. Morais Smith

Symmetry is one of the cornerstones of modern physics and has profound implications in different areas. In topological systems, symmetries are responsible for protecting surface states, which are at the heart of the fascinating properties exhibited by these materials. When the symmetry protecting the edge mode is broken, the topological phase becomes trivial. By engineering losses that break the symmetry protecting a topological Hermitian phase, we show that a new genuinely non-Hermitian symmetry emerges, which protects and selects one of the boundary modes: the topological monomode. Moreover, the topology of the non-Hermitian system can be characterized by an effective Hermitian Hamiltonian in a higher dimension. To corroborate the theory, we experimentally investigated the non-Hermitian 1D and 2D SSH models using photonic lattices and observed dynamically generated monomodes in both cases. We classify the systems in terms of the (non-Hermitian) symmetries that are present and calculate the corresponding topological invariants. Our findings might have profound implications for photonics and quantum optics because topological monomodes increase the robustness of corner states by preventing recombination.

Weyl Semimetallic State in the Rashba-Hubbard Model. (arXiv:2307.04307v2 [cond-mat.str-el] UPDATED)
Katsunori Kubo

We investigate the Hubbard model with the Rashba spin-orbit coupling on a square lattice. The Rashba spin-orbit coupling generates two-dimensional Weyl points in the band dispersion. In a system with edges along [11] direction, zero-energy edge states appear, while no edge state exists for a system with edges along an axis direction. The zero-energy edge states with a certain momentum along the edges are predominantly in the up-spin state on the right edge, while they are predominantly in the down-spin state on the left edge. Thus, the zero-energy edge states are helical. By using a variational Monte Carlo method for finite Coulomb interaction cases, we find that the Weyl points can move toward the Fermi level by the correlation effects. We also investigate the magnetism of the model by the Hartree-Fock approximation and discuss weak magnetic order in the weak-coupling region.

Emerging topological bound states in Haldane model zigzag nanoribbons. (arXiv:2307.14771v3 [cond-mat.mes-hall] UPDATED)
Simone Traverso, Maura Sassetti, Niccolò Traverso Ziani

Zigzag nanoribbons hosting the Haldane Chern insulator model are considered. In this context, a reentrant topological phase, characterized by the emergence of quasi zero dimensional in-gap states, is discussed. The bound states, which reside in the gap opened by the hybridization of the counter-propagating edge modes of the Haldane phase, are localized at the ends of the strip and are found to be robust against on-site disorder. These findings are supported by the behavior of the Zak phase over the parameter space, which exhibits jumps of $\pi$ in correspondence to the phase transitions between the trivial and the non-trivial phases. The effective mass inversion leading to the jumps in the Zak phase is interpreted in a low energy framework. Setups with non-uniform parameters also show topological bound states via the Jackiw-Rebbi mechanism. All the properties reported are shown to be extremely sensitive to the strip width.

Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh$_2$As$_2$. (arXiv:2308.10663v2 [cond-mat.str-el] UPDATED)
Denise S. Christovam, Miguel Ferreira-Carvalho, Andrea Marino, Martin Sundermann, Daisuke Takegami, Anna Melendez-Sans, Ku Ding Tsuei, Zhiwei Hu, Sahana Roessler, Manuel Valvidares, Maurits W. Haverkort, Yu Liu, Eric D. Bauer, Liu Hao Tjeng, Gertrud Zwicknagl, Andrea Severing

CeRh$_2$As$_2$ is a new multiphase superconductor with strong suggestions for an additional itinerant multipolar ordered phase. The modeling of the low temperature properties of this heavy fermion compound requires a quartet Ce$^{3+}$ crystal-field ground state. Here we provide the evidence for the formation of such a quartet state using x-ray spectroscopy. Core-level photoelectron and x-ray absorption spectroscopy confirm the presence of Kondo hybridization in CeRh$_2$As$_2$. The temperature dependence of the linear dichroism unambiguously reveils the impact of Kondo physics for coupling the Kramer's doublets into an effective quasi-quartet. Non-resonant inelastic x-ray scattering data find that the $|\Gamma_7^- \rangle$ state with its lobes along the 110 direction of the tetragonal structure ($xy$ orientation) contributes most to the multi-orbital ground state of CeRh$_2$As$_2$.

Irreducible momentum-space spin structure of Weyl semimetals and its signatures in Friedel oscillations. (arXiv:2308.11986v2 [cond-mat.mes-hall] UPDATED)
Andy Knoll, Carsten Timm

Materials that break time-reversal or inversion symmetry possess nondegenerate electronic bands, which can touch at so-called Weyl points. The spinor eigenstates in the vicinity of a Weyl point exhibit a well-defined chirality $\pm 1$. Numerous works have studied the consequences of this chirality, for example in unconventional magnetoelectric transport. However, even a Weyl point with isotropic dispersion is not only characterized by its chirality but also by the momentum dependence of the spinor eigenstates. For a single Weyl point, this momentum-space spin structure can be brought into standard "hedgehog" form by a unitary transformation, but for two or more Weyl points, this is not possible. In this work, we show that the relative spin structure of a pair of Weyl points has strong qualitative signatures in the electromagnetic response. Specifically, we investigate the Friedel oscillations in the induced charge density due to a test charge for a centrosymmetric system consisting of two Weyl points with isotropic dispersion. The most pronounced signature is that the amplitude of the Friedel oscillations falls off as $1/r^4$ in directions in which both Weyl points exhibit the same spin structure, while for directions with inverted spin structures, the amplitude of the Friedel oscillations decreases as $1/r^3$.

Anomaly Enforced Gaplessness and Symmetry Fractionalization for $Spin_G$ Symmetries. (arXiv:2308.12999v3 [hep-th] UPDATED)
T. Daniel Brennan

Symmetries and their anomalies give strong constraints on renormalization group (RG) flows of quantum field theories. Recently, the identification of a theory's global symmetries with its topological sector has provided additional constraints on RG flows to symmetry preserving gapped phases due to mathematical results in category and topological quantum field theory. In this paper, we derive constraints on RG flows from $\mathbb{Z}_2$-valued pure- and mixed-gravitational anomalies that can only be activated on non-spin manifolds. We show that such anomalies cannot be matched by a unitary, symmetry preserving gapped phase without symmetry fractionalization. In particular, we discuss examples that commonly arise in $4d$ gauge theories with fermions.

Itinerant ferromagnetism in transition metal dichalcogenides moir\'e superlattices. (arXiv:2309.05556v3 [cond-mat.str-el] UPDATED)
Pawel Potasz, Nicolás Morales-Durán, 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.

Noise-Induced Phase Separation and Time Reversal Symmetry Breaking in active field theories driven by persistent noise. (arXiv:2310.03423v2 [cond-mat.stat-mech] UPDATED)
Matteo Paoluzzi, Demian Levis, Andrea Crisanti, Ignacio Pagonabarraga

Within the Landau-Ginzburg picture of phase transitions, scalar field theories develop phase separation because of a spontaneous symmetry-breaking mechanism. This picture works in thermodynamics but also in the dynamics of phase separation. Here we show that scalar non-equilibrium field theories undergo phase separation just because of non-equilibrium fluctuations driven by a persistent noise. The mechanism is similar to what happens in Motility-Induced Phase Separation where persistent motion introduces an effective attractive force. We observe that Noise-Induced Phase Separation occurs in a region of the phase diagram where disordered field configurations would otherwise be stable at equilibrium. Measuring the local entropy production rate to quantify the time-reversal symmetry breaking, we find that such breaking is concentrated on the boundary between the two phases.

Dispersive Drumhead States in Nodal-Line Semimetal Junctions. (arXiv:2310.03896v2 [cond-mat.mes-hall] UPDATED)
Francesco Buccheri, Reinhold Egger, Alessandro De Martino

We consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian including only the two crossing bands, we show that these junctions accommodate a two-dimensional zero-energy level and a set of two-dimensional dispersive bands, corresponding to states localized at the interface. We characterize the spectrum, identifying the parameter ranges in which these states are present, and highlight the role of the nodal radius and the smoothness of the interface. We also suggest material-independent ways to detect and identify these states, using optical conductivity and infrared absorption spectroscopy in magnetic field.

Giant magnetoresistance in weakly disordered non-Galilean invariant conductors. (arXiv:2310.12195v2 [cond-mat.mes-hall] UPDATED)
Alex Levchenko, Songci Li, A. V. Andreev

We develop a hydrodynamic description of electron magnetotransport in conductors without Galilean invariance in the presence of a weak long-range disorder potential. We show that magnetoresistance becomes strong (of order 100 %) at relatively small fields, at which the inverse square of the magnetic length becomes comparable to disorder-induced variations of the electron density. The mechanism responsible for this anomalously strong magnetoresistance can be traced to the appearance of magnetic friction force in liquids with nonvanishing intrinsic conductivity. We derive general results for the galvanomagnetic and thermomagnetic kinetic coefficients, and obtain their dependence on the intrinsic dissipative properties of the electron liquid and the correlation function of the disorder potential. We apply this theory to graphene close to charge neutrality and cover the crossover to a high-density regime.

Customizing PBE Exchange-Correlation functionals: A comprehensive approach for band gap prediction in diverse semiconductors. (arXiv:2311.11702v3 [cond-mat.mtrl-sci] UPDATED)
Satadeep Bhattacharjee, Namitha Anna Koshi, Seung-Cheol Lee

Accurate prediction of band gaps in semiconductors is essential for advancing materials science and semiconductor technology. This paper extends the conventional Perdew-Burke-Ernzerhof (PBE) functional to a broad range of semiconductors, addressing the complexities introduced by varying treatments of the exchange and correlation enhancement factors within the framework of Density Functional Theory (DFT). These customized functionals provide a more transparent solution than previous DFT+U approaches, which required large negative U values for various chalcogens and pnictides (such as Sulfur (S), Selenium (Se), and Phosphorus (P)) which is physically unrealistic. The calculations based on these customized functionals are also much more cost-effective than GW or HSE-based calculations. Although the modified functionals are primarily focused on band gap predictions, they still provide reasonably accurate lattice constants.

Giant chirality-induced spin polarization in twisted transition metal dichalcogenides. (arXiv:2312.09169v2 [cond-mat.mes-hall] UPDATED)
Guido Menichetti, Lorenzo Cavicchi, Leonardo Lucchesi, Fabio Taddei, Giuseppe Iannaccone, Pablo Jarillo-Herrero, Claudia Felser, Frank H. L. Koppens, Marco Polini

Chirality-induced spin selectivity (CISS) is an effect that has recently attracted a great deal of attention in chiral chemistry and that remains to be understood. In the CISS effect, electrons passing through chiral molecules acquire a large degree of spin polarization. In this work we study the case of atomically-thin chiral crystals created by van der Waals assembly. We show that this effect can be spectacularly large in systems containing just two monolayers, provided they are spin-orbit coupled. Its origin stems from the combined effects of structural chirality and spin-flipping spin-orbit coupling. We present detailed calculations for twisted homobilayer transition metal dichalcogenides, showing that the chirality-induced spin polarization can be giant, e.g. easily exceeding $50\%$ for ${\rm MoTe}_2$. Our results clearly indicate that twisted quantum materials can operate as a fully tunable platform for the study and control of the CISS effect in condensed matter physics and chiral chemistry.

Crossover from Integer to Fractional Quantum Hall Effect. (arXiv:2401.06965v2 [cond-mat.str-el] UPDATED)
Koji Kudo, Jonathan Schirmer, Jainendra K. Jain

The parton theory constructs candidate FQH states by decomposing the physical particles into unphysical partons, placing the partons in IQH states, and then gluing the partons back into the physical particles. Field theoretical formulations execute the gluing process through the device of emergent gauge fields. Here we study the process of going from the IQH effect of fermionic partons to the FQH effect of bosons by introducing an attractive interaction between the fermions and continuously increasing its strength. It is far from obvious, a priori, that this process could be adiabatic, that is, go through without a gap closing, given that the wave function of the bosonic bound state and its Landau levels (LLs) involve all LLs of the fermions. The absence of an energy cutoff also makes the theoretical study challenging. We proceed by considering fermions on a lattice (a convenient lattice for our purposes is a subdivided icosahedron enclosing a magnetic monopole, which simulates the standard spherical geometry used in theoretical studies of the FQH effect), wherein it is possible to work with the full Hilbert space during the entire process. For all finite systems that we have studied, we find that the system of two species of fermions occupying IQH states evolves adiabatically into the FQH effect of the bosons, suggesting that the process may be adiabatic also in the thermodynamic limit. This physics, reminiscent of the well studied BCS to BEC crossover, can in principle be realized in ultra-cold atomic systems consisting of two species of fermionic atoms in a synthetic magnetic field. Our study suggests that as the strength of the attractive interaction between the fermions of different species is increased, the system will exhibit a crossover, without gap closing, from two independent IQH states of fermionic atoms to a FQH state of bosonic molecules.

Found 8 papers in prb
Date of feed: Wed, 24 Jan 2024 04:17:01 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)

Excitations in the higher-lattice gauge theory model for topological phases. III. The (3+1)-dimensional case
Joe Huxford and Steven H. Simon
Author(s): Joe Huxford and Steven H. Simon

In this, the third paper in our series describing the excitations of the higher-lattice gauge theory model for topological phases, we will examine the (3+1)-dimensional case in detail. We will explicitly construct the ribbon and membrane operators which create the topological excitations, and use th…

[Phys. Rev. B 109, 035152] Published Tue Jan 23, 2024

Multi-Dirac and Weyl physics in heavy-fermion systems
Joelson F. Silva and E. Miranda
Author(s): Joelson F. Silva and E. Miranda

We have studied multi-Dirac/Weyl systems with arbitrary topological charge $n$ in the presence of a lattice of local magnetic moments. To do so we propose a multi-Dirac/Weyl Kondo lattice model which is analyzed through a mean-field approach appropriate to the paramagnetic phase. We study both the b…

[Phys. Rev. B 109, 035153] Published Tue Jan 23, 2024

Superstructures and magnetic order in heavily Cu-substituted ${({\mathrm{Fe}}_{1−x}{\mathrm{Cu}}_{x})}_{1+y}\mathrm{Te}$
Saizheng Cao, Xin Ma, Dongsheng Yuan, Zhen Tao, Xiang Chen, Yu He, Patrick N. Valdivia, Shan Wu, Hang Su, Wei Tian, Adam A. Aczel, Yaohua Liu, Xiaoping Wang, Zhijun Xu, Huiqiu Yuan, Edith Bourret-Courchesne, Chao Cao, Xingye Lu, Robert Birgeneau, and Yu Song
Author(s): Saizheng Cao, Xin Ma, Dongsheng Yuan, Zhen Tao, Xiang Chen, Yu He, Patrick N. Valdivia, Shan Wu, Hang Su, Wei Tian, Adam A. Aczel, Yaohua Liu, Xiaoping Wang, Zhijun Xu, Huiqiu Yuan, Edith Bourret-Courchesne, Chao Cao, Xingye Lu, Robert Birgeneau, and Yu Song

Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector $\mathbf{Q}=(\frac{1}{2},\frac{1}{2})$. In contrast, ${\mathrm{Fe}}_{1+y}\mathrm{Te}$, the parent compound of the ${\mathrm{Fe}}_{1+y}{\mathrm{Te}}_{1−x}{\mathrm{Se}}_{x}$ superconductors, exhibits do…

[Phys. Rev. B 109, 045142] Published Tue Jan 23, 2024

Fermi liquids beyond the forward-scattering limit: The role of nonforward scattering for scale invariance and instabilities
Han Ma and Sung-Sik Lee
Author(s): Han Ma and Sung-Sik Lee

Landau Fermi liquid theory is a fixed-point theory of metals that includes the forward-scattering amplitudes as exact marginal couplings. However, the fixed-point theory that only includes the strict forward scatterings is nonlocal in real space. In this paper, we revisit the Fermi liquid theory for…

[Phys. Rev. B 109, 045143] Published Tue Jan 23, 2024

Itinerant ferromagnetism in transition metal dichalcogenide moiré superlattices
Pawel Potasz, Nicolás Morales-Durán, Nai Chao Hu, and Allan H. MacDonald
Author(s): Pawel Potasz, Nicolás Morales-Durán, Nai Chao Hu, and Allan H. MacDonald

Moiré superlattices give a unique opportunity to investigate controllable quantum systems. Previous studies of transition metal dichalcogenide heterobilayers mainly focused on magnetic order at half-filling or charge orders at partial fillings. Here, the authors investigate itinerant ferromagnetism in the vicinity of the van Hove singularity of moiré triangular superlattices. From many-body exact diagonalization calculations that shed light on the magnon spectra and the magnetic susceptibility, the Curie temperature is estimated to vary with moiré lattice constant, from a few to a few tens of kelvins.

[Phys. Rev. B 109, 045144] Published Tue Jan 23, 2024

Gapless fluctuations and exceptional points in semiconductor lasers
N. H. Kwong, M. Em. Spotnitz, and R. Binder
Author(s): N. H. Kwong, M. Em. Spotnitz, and R. Binder

Semiconductor lasers have formal analogies to Bardeen-Cooper-Schrieffer (BCS) superconductors. This work shows that, in analogy to gapless superconductivity, a gapless lasing parametric regime, in which the frequency gap in the fluctuation spectrum is closed, exists for steady-state semiconductor lasers. The gap opens when the laser intensity exceeds a threshold. This gapless-to-gapped transition occurs at a third-order exceptional point.

[Phys. Rev. B 109, 045306] Published Tue Jan 23, 2024

Photonic ferroelectric vortex lattice
Ramaz Khomeriki, Vakhtang Jandieri, Koki Watanabe, Daniel Erni, Douglas H. Werner, Marin Alexe, and Jamal Berakdar
Author(s): Ramaz Khomeriki, Vakhtang Jandieri, Koki Watanabe, Daniel Erni, Douglas H. Werner, Marin Alexe, and Jamal Berakdar

The recent discovery of polar vortex textures revealed a new fascinating facet of nanoscale ferroelectric materials with prospects for new interaction pathways with chiral, topological, and photonic materials. Here, we demonstrate how the subterahertz collective response of the ferroelectric vortex …

[Phys. Rev. B 109, 045428] Published Tue Jan 23, 2024

Absence of edge states at armchair edges in inhomogeneously strained graphene under a pseudomagnetic field
Jing-Yun Fang, Yu-Chen Zhuang, and Qing-Feng Sun
Author(s): Jing-Yun Fang, Yu-Chen Zhuang, and Qing-Feng Sun

Nonuniform strain in graphene can induce a pseudomagnetic field (PMF) preserving time-reversal symmetry, generating pseudo-Landau levels under zero real magnetic field (MF). The different natures between PMF and real MF lead to the counterpropagating valley-polarized edge states under the PMF and un…

[Phys. Rev. B 109, 045430] Published Tue Jan 23, 2024

Found 5 papers in prl
Date of feed: Wed, 24 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)

Exploring High-Purity Multiparton Scattering at Hadron Colliders
Jeppe R. Andersen, Pier Francesco Monni, Luca Rottoli, Gavin P. Salam, and Alba Soto-Ontoso
Author(s): Jeppe R. Andersen, Pier Francesco Monni, Luca Rottoli, Gavin P. Salam, and Alba Soto-Ontoso

Multiparton interactions are a fascinating phenomenon that occur in almost every high-energy hadron-hadron collision yet are remarkably difficult to study quantitatively. In this Letter, we present a strategy to optimally disentangle multiparton interactions from the primary scattering in a collisio…

[Phys. Rev. Lett. 132, 041901] Published Tue Jan 23, 2024

Interferometer for Dispersive Measurements
S. E. Harris
Author(s): S. E. Harris

We suggest the use of broadband frequency modulation to construct a novel type of optical interferometer. This interferometer is insensitive to optical phase and allows measurement of the group velocity and group velocity dispersion without the need for short pulse apparatus.

[Phys. Rev. Lett. 132, 043802] Published Tue Jan 23, 2024

Photonic Flatband Resonances in Multiple Light Scattering
Thanh Xuan Hoang, Daniel Leykam, and Yuri Kivshar
Author(s): Thanh Xuan Hoang, Daniel Leykam, and Yuri Kivshar

Light–matter interactions in certain one-dimensional photonic materials can bring light nearly to a standstill, an effect that researchers show requires consideration of long-range interactions between the material’s components.

[Phys. Rev. Lett. 132, 043803] Published Tue Jan 23, 2024

Role of Topology in Relaxation of One-Dimensional Stochastic Processes
Taro Sawada, Kazuki Sone, Ryusuke Hamazaki, Yuto Ashida, and Takahiro Sagawa
Author(s): Taro Sawada, Kazuki Sone, Ryusuke Hamazaki, Yuto Ashida, and Takahiro Sagawa

Stochastic processes are commonly used models to describe dynamics of a wide variety of nonequilibrium phenomena ranging from electrical transport to biological motion. The transition matrix describing a stochastic process can be regarded as a non-Hermitian Hamiltonian. Unlike general non-Hermitian …

[Phys. Rev. Lett. 132, 046602] Published Tue Jan 23, 2024

Programmable Potentials Choreograph Defects in a Colloidal Crystal Shell
Guolong Zhu, Lijuan Gao, Yuming Wang, Tsvi Tlusty, and Li-Tang Yan
Author(s): Guolong Zhu, Lijuan Gao, Yuming Wang, Tsvi Tlusty, and Li-Tang Yan

Crystallization on spherical surfaces is obliged by topology to induce lattice defects. But controlling the organization of such defects remains a great challenge due to the long-range constraints of the curved geometry. Here, we report on DNA-coated colloids whose programmable interaction potential…

[Phys. Rev. Lett. 132, 048201] Published Tue Jan 23, 2024

Found 1 papers in pr_res
Date of feed: Wed, 24 Jan 2024 04:16:59 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)

Noise within: Signal-to-noise enhancement via coherent wave amplification in the mammalian cochlea
Alessandro Altoè and Christopher A. Shera
Author(s): Alessandro Altoè and Christopher A. Shera

The extraordinary sensitivity of the mammalian inner ear has captivated scientists for decades, largely due to the crucial role played by the outer hair cells (OHCs) and their unique electromotile properties. Typically arranged in three rows along the sensory epithelium, the OHCs work in concert via…

[Phys. Rev. Research 6, 013084] Published Tue Jan 23, 2024

Found 3 papers in nano-lett
Date of feed: Tue, 23 Jan 2024 14:05:42 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] Experimental Decoding and Tuning Electronic Friction of Si Nanotip Sliding on Graphene
Yutao Li, Bozhao Wu, Wengen Ouyang, Ze Liu, and Wen Wang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c03642

[ASAP] Quantum Conductance in Vertical Hexagonal Boron Nitride Memristors with Graphene-Edge Contacts
Jing Xie, Md Naim Patoary, Md Ashiqur Rahman Laskar, Nicholas D. Ignacio, Xun Zhan, Umberto Celano, Deji Akinwande, and Ivan Sanchez Esqueda

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04057

[ASAP] Monolayer-like Exciton Recombination Dynamics of Multilayer MoSe2 Observed by Pump–Probe Microscopy
Cullen P. Walsh, Jason P. Malizia, Sarah C. Sutton, John M. Papanikolas, and James F. Cahoon

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04754

Found 2 papers in acs-nano
Date of feed: Tue, 23 Jan 2024 14:03:46 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] Hybrid Edge Results in Narrowed Band Gap: Bottom-up Liquid-Phase Synthesis of Bent N = 6/8 Armchair Graphene Nanoribbons
Gang Li, Hanfei Wang, Michael Loes, Anshul Saxena, Jiangliang Yin, Mamun Sarker, Shinyoung Choi, Narayana Aluru, Joseph W. Lyding, Alexander Sinitskii, and Guangbin Dong

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ACS Nano
DOI: 10.1021/acsnano.3c09825

[ASAP] Coexisting Phases in Transition Metal Dichalcogenides: Overview, Synthesis, Applications, and Prospects
Haiyang Liu, Yaping Wu, Zhiming Wu, Sheng Liu, Vanessa Li Zhang, and Ting Yu

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ACS Nano
DOI: 10.1021/acsnano.3c10665