Found 32 papers in cond-mat
Date of feed: Thu, 07 Sep 2023 00:30:00 GMT

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Symmetry dictated universal helicity redistribution of Dirac fermions in transport. (arXiv:2309.02474v1 [cond-mat.mes-hall])
Jun-Yin Huang, Rui-Hua Ni, Hong-Ya Xu, Liang Huang

Helicity is a fundamental property of Dirac fermions. Yet, how it changes in transport processes remains largely mysterious. We uncover, theoretically, the rule of spinor state transformation and consequently universal helicity redistribution in two cases of transport through potentials of electrostatic and mass types, respectively. The former is dictated by Lorentz boost and its complex counterpart in Klein tunneling regime. The latter is governed by an abstract rotation group we identified, which reduces to SO(2) when acting on the plane of effective mass and momentum. This endows an extra structure foliating the Hilbert space of Dirac spinors, establishes miraculously a unified yet latent connection between helicity, Klein tunneling, and Lorentz boost. Our results thus deepen the understanding of relativistic quantum transport, and may open a new window for exotic helicity-based physics and applications in mesoscopic systems.

Connecting the many-body Chern number to Luttinger's theorem through St\v{r}eda's formula. (arXiv:2309.02483v1 [cond-mat.str-el])
Lucila Peralta Gavensky, Subir Sachdev, Nathan Goldman

Relating the quantized Hall response of correlated insulators to many-body topological invariants is a key challenge in topological quantum matter. Here, we use Streda's formula to derive an expression for the many-body Chern number in terms of the single-particle interacting Green's function and its derivative with respect to a magnetic field. In this approach, we find that this many-body topological invariant can be decomposed in terms of two contributions, $N_3[G] + \Delta N_3[G]$, where $N_3[G]$ is known as the Ishikawa-Matsuyama invariant, and where the second term involves derivatives of the Green's function and the self energy with respect to the magnetic perturbation. As a by product, the invariant $N_3[G]$ is shown to stem from the derivative of Luttinger's theorem with respect to the probe magnetic field. These results reveal under which conditions the quantized Hall conductivity of correlated topological insulators is solely dictated by the invariant $N_3[G]$, providing new insight on the origin of fractionalization in strongly-correlated topological phases.

Transverse Quantum Fluids. (arXiv:2309.02501v1 [cond-mat.other])
Anatoly Kuklov, Nikolay Prokof'ev, Leo Radzihovsky, Boris Svistunov

Motivated by remarkable properties of superfluid edge dislocations in solid Helium-4, we discuss a broad class of quantum systems -- boundaries in phase separated lattice states, magnetic domain walls, and ensembles of Luttinger liquids -- that can be classified as Transverse Quantum Fluids (TQF). After introducing the general idea of TQF, we focus on a coupled array of Luttinger liquids forming an incoherent TQF. This state is a long-range ordered quasi-one-dimensional superfluid, topologically protected against quantum phase slips by tight-binding of instanton dipoles, that has no coherent quasi-particle excitations at low energies. Incoherent TQF is a striking example of the irrelevance of the Landau quasiparticle criterion for superfluidity in systems that lack Galilean invariance. We detail its phenomenology, to motivate a number of experimental studies in condensed matter and cold atomic systems.

Geometric squeezing of rotating quantum gases into the lowest Landau level. (arXiv:2309.02510v1 [cond-mat.quant-gas])
Valentin Crépel, Ruixiao Yao, Biswaroop Mukherjee, Richard J. Fletcher, Martin Zwierlein

The simulation of quantum Hall physics with rotating quantum gases is witnessing a revival due to recent experimental advances that enabled the observation of a Bose-Einstein condensate entirely contained in its lowest kinetic energy state, i.e. the lowest Landau level. We theoretically describe this experimental result, and show that it can be interpreted as a squeezing of the geometric degree of freedom of the problem, the guiding center metric. This "geometric squeezing" offers an unprecedented experimental control over the quantum geometry in Landau-level analogues, and at the same time opens a realistic path towards achieving correlated quantum phases akin to quantum Hall states with neutral atoms.

Enhancing the Stretchability of Two-Dimensional Materials through Kirigami: A Molecular Dynamics Study on Tungsten Disulfide. (arXiv:2309.02531v1 [physics.comp-ph])
K. Dey, S. Shahriar, M. A. R. Anan, P. Malakar, M. M. Rahman, M. M. Chowdhury

In recent years, the 'kirigami' technique has gained significant attention for creating meta-structures and meta-materials with exceptional characteristics, such as unprecedented stretchability. These properties, not typically inherent in the original materials or structures, present new opportunities for applications in stretchable electronics and photovoltaics. However, despite its scientific and practical significance, the application of kirigami patterning on a monolayer of tungsten disulfide (WS2), a van der Waals material with exceptional mechanical, electronic, and optical properties, has remained unexplored. This study utilizes molecular dynamics (MD) simulations to investigate the mechanical properties of monolayer WS2 with rectangular kirigami cuts. We find that, under tensile loading, the WS2 based kirigami structure exhibits a notable increase in tensile strain and a decrease in strength, thus demonstrating the effectiveness of the kirigami cutting technique in enhancing the stretchability of monolayer WS2. Additionally, increasing the overlap ratio enhances the stretchability of the structure, allowing for tailored high strength or high strain requirements. Furthermore, our observations reveal that increasing the density of cuts and reducing the length-to-width ratio of the kirigami nanosheet further improve the fracture strain, thereby enhancing the overall stretchability of the proposed kirigami patterned structure of WS2.

Design of Oscillatory Neural Networks by Machine Learning. (arXiv:2309.02532v1 [cond-mat.dis-nn])
Tamas Rudner, Wolfgang Porod, Gyorgy Csaba

We demonstrate the utility of machine learning algorithms for the design of Oscillatory Neural Networks (ONNs). After constructing a circuit model of the oscillators in a machine-learning-enabled simulator and performing Backpropagation through time (BPTT) for determining the coupling resistances between the ring oscillators, we show the design of associative memories and multi-layered ONN classifiers. The machine-learning-designed ONNs show superior performance compared to other design methods (such as Hebbian learning) and they also enable significant simplifications in the circuit topology. We demonstrate the design of multi-layered ONNs that show superior performance compared to single-layer ones. We argue Machine learning can unlock the true computing potential of ONNs hardware.

Emergence of Exotic Spin Texture in Supramolecular Metal Complexes on a 2D Superconductor. (arXiv:2309.02537v1 [cond-mat.supr-con])
Viliam Vaňo, Stefano Reale, Orlando J. Silveira, Danilo Longo, Mohammad Amini, Massine Kelai, Jaehyun Lee, Atte Martikainen, Shawulienu Kezilebieke, Adam S. Foster, Jose L. Lado, Fabio Donati, Peter Liljeroth, Linghao Yan

Designer heterostructures, where the desired physics emerges from the controlled interactions between different components, represent one of the most powerful strategies to realize unconventional electronic states. This approach has been particularly fruitful in combining magnetism and superconductivity to create exotic superconducting states. In this work, we use a heterostructure platform combining supramolecular metal complexes (SMCs) with a quasi-2D van der Waals (vdW) superconductor NbSe$_2$. Our scanning tunneling microscopy (STM) measurements demonstrate the emergence of Yu-Shiba-Rusinov (YSR) bands arising from the interaction between the SMC magnetism and the NbSe$_2$ superconductivity. Using X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements, we show the presence of antiferromagnetic coupling between the SMC units. These result in the emergence of an unconventional $3\times3$ reconstruction in the magnetic ground state that is directly reflected in real space modulation of the YSR bands. The combination of flexible molecular building blocks, frustrated magnetic textures, and superconductivity in heterostructures establishes a fertile starting point to fabricating tunable quantum materials, including unconventional superconductors and quantum spin liquids.

Magnetoplasmons in magic-angle twisted bilayer graphene. (arXiv:2309.02546v1 [cond-mat.mes-hall])
Thi-Nga Do, Po-Hsin Shih, Godrey Gumbs

The magic-angle twisted bilayer graphene (MATBLG) has been demonstrated to exhibit exotic physical properties due to the special flat bands. However, exploiting the engineering of such properties by external fields is still in it infancy. Here we show that MATBLG under an external magnetic field presents a distinctive magnetoplasmon dispersion, which can be significantly modified by transferred momentum and charge doping. Along a wide range of transferred momentum, there exist special pronounced single magnetoplasmon and horizontal single-particle excitation modes near charge neutrality. We provide an insightful discussion of such unique features based on the electronic excitation of Landau levels quantized from the flat bands and Landau damping. Additionally, charge doping leads to peculiar multiple strong-weight magnetoplasmons. These characteristics make MATBLG a favorable candidate for plasmonic devices and technology applications.

How to measure the free energy and partition function from atom-atom correlations. (arXiv:2309.02595v1 [cond-mat.quant-gas])
Matthew L. Kerr, Karen V. Kheruntsyan

We propose an experimental approach for determining thermodynamic properties of ultracold atomic gases with short-range interactions. As a test case, we focus on the one-dimensional (1D) Bose gas described by the integrable Lieb-Liniger model. The proposed approach relies on deducing the Helmholtz or Landau free energy directly from measurements of local atom-atom correlations by utilising the inversion of a finite-temperature version of the Hellmann-Feynman theorem. We demonstrate this approach theoretically by deriving approximate analytic expressions for the free energies in specific asymptotic regimes of the 1D Bose gas and find excellent agreement with the exact results based on the thermodynamic Bethe ansatz available for this integrable model.

Human Learning of Hierarchical Graphs. (arXiv:2309.02665v1 [q-bio.NC])
Xiaohuan Xia (1), Andrei A. Klishin (1), Jennifer Stiso (1), Christopher W. Lynn (2, 3), Ari E. Kahn (4), Lorenzo Caciagli (1), Dani S. Bassett (1 and 5) ((1) Department of Bioengineering, University of Pennsylvania, (2) Joseph Henry Laboratories of Physics, Princeton University, (3) Initiative for the Theoretical Sciences, Graduate Center, City University of New York, (4) Princeton Neuroscience Institute, Princeton University, (5) Santa Fe Institute)

Humans are constantly exposed to sequences of events in the environment. Those sequences frequently evince statistical regularities, such as the probabilities with which one event transitions to another. Collectively, inter-event transition probabilities can be modeled as a graph or network. Many real-world networks are organized hierarchically and understanding how humans learn these networks is an ongoing aim of current investigations. While much is known about how humans learn basic transition graph topology, whether and to what degree humans can learn hierarchical structures in such graphs remains unknown. We investigate how humans learn hierarchical graphs of the Sierpi\'nski family using computer simulations and behavioral laboratory experiments. We probe the mental estimates of transition probabilities via the surprisal effect: a phenomenon in which humans react more slowly to less expected transitions, such as those between communities or modules in the network. Using mean-field predictions and numerical simulations, we show that surprisal effects are stronger for finer-level than coarser-level hierarchical transitions. Surprisal effects at coarser levels of the hierarchy are difficult to detect for limited learning times or in small samples. Using a serial response experiment with human participants (n=$100$), we replicate our predictions by detecting a surprisal effect at the finer-level of the hierarchy but not at the coarser-level of the hierarchy. To further explain our findings, we evaluate the presence of a trade-off in learning, whereby humans who learned the finer-level of the hierarchy better tended to learn the coarser-level worse, and vice versa. Our study elucidates the processes by which humans learn hierarchical sequential events. Our work charts a road map for future investigation of the neural underpinnings and behavioral manifestations of graph learning.

Dynamical relaxation behavior of extended XY chain with gapless phase following a quantum quench. (arXiv:2309.02686v1 [cond-mat.stat-mech])
Kaiyuan Cao, Yayun Hu, Peiqing Tong, Guangwen Yang

We investigate the dynamical relaxation behavior of the two-point correlation in extended XY models with a gapless phase after quenches from various initial states. Specifically, we study the XY chain with gapless phase induced by the additional interactions: Dzyaloshinskii-Moriya interaction and XZY-YZX type of three-site interaction. When quenching from the gapped phase, we observe that the additional interactions have no effect on the relaxation behavior. The relaxation behavior is $\delta C_{mn}(t)\sim t^{-3/2}$ and $\sim t^{-1/2}$ for the quench to the commensurate phase and the incommensurate phase, respectively. However, when quenching from the gapless phase, we demonstrate that the scaling behavior of $\delta C_{mn}(t)$ is changed to $\sim t^{-1}$ for the quench to the commensurate phase, and the decay of $\delta C_{mn}(t)$ follows $\sim t^{-1}$ or $\sim t^{-1/2}$ for the quench to the incommensurate phase depending on the parameters of pre-quench Hamiltonian. We also establish the dynamical phase diagrams based on the dynamical relaxation behavior of $\delta C_{mn}(t)$ in the extended XY models.

Magic angle (in)stability and mobility edges in disordered Chern insulators. (arXiv:2309.02701v1 [math-ph])
Simon Becker, Izak Oltman, Martin Vogel

Why do experiments only exhibit one magic angle if the chiral limit of the Bistritzer-MacDonald Hamiltonian suggest a plethora of them? - In this article, we investigate the remarkable stability of the first magic angle in contrast to higher (smaller) magic angles. More precisely, we examine the influence of disorder on magic angles and the Bistritzer-MacDonald Hamiltonian. We establish the existence of a mobility edge near the energy of the flat band for small disorder. We also show that the mobility edges persist even when all global Chern numbers become zero, leveraging the $C_{2z}T$ symmetry of the system to demonstrate non-trivial sublattice transport. This effect is robust even beyond the chiral limit and in the vicinity of perfect magic angles, as is expected from experiments.

Topology of Bi$_2$Se$_3$ nanosheets. (arXiv:2309.02792v1 [cond-mat.mes-hall])
Lucas Maisel Licerán, Sebastiaan Koerhuis, Daniel Vanmaekelbergh, Henk Stoof

Recently, the quantum spin-Hall edge channels of two-dimensional colloidal nanocrystals of the topological insulator Bi$_2$Se$_3$ were observed directly. Motivated by this development, we reconsider the four-band effective model which has been traditionally employed in the past to describe thin nanosheets of this material. Derived from a three-dimensional $\boldsymbol{k} \boldsymbol{\cdot} \boldsymbol{p}$ model, it physically describes the top and bottom electronic surface states that become gapped due to the material's small thickness. However, we find that the four-band model for the surface states alone, as derived directly from the three-dimensional theory, is inadequate for the description of thin films of a few quintuple layers and even yields an incorrect topological invariant within a significant range of thicknesses. To address this limitation we propose an eight-band model which, in addition to the surface states, also incorporates the set of bulk bands closest to the Fermi level. We find that the eight-band model not only captures most of the experimental observations, but also agrees with previous first-principles calculations of the $\mathbb{Z}_{2}$ invariant in thin films of varying thickness. Moreover, we demonstrate that the topological properties of thin Bi$_2$Se$_3$ nanosheets emerge as a result of an intricate interplay between the surface and bulk states, which in fact results in nontrivial Chern numbers for the latter.

Topological spin texture and d-vector rotation in spin-triplet superconductors: A case of UTe2. (arXiv:2309.02918v1 [cond-mat.supr-con])
Yasumasa Tsutsumi, Kazushige Machida

A novel spin texture formed by Cooper pair spins is found theoretically with a phase string attached by half-quantized vortices at both ends in a unit cell and characterized by its topologically rich vortex structure in a spin-triplet pairing. It is stable at an intermediate field region sandwiched by two conventional singular vortex phases below and above it. The d-vector direction of this spin texture is tilted from the principal crystal axes, whose spin susceptibility is neither the normal Pauli one \c{hi}N nor zero, describing microscopically the process of the d-vector rotation phenomena observed recently in UTe2. We compare the spin texture and singular vortex state in relation to the quasi-particle structure with Majorana zero modes for STM, the nuclear spin resonance spectral line width for NMR and {\mu}SR, and the vortex form factors for SANS to facilitate the identification of the pairing symmetry in UTe2.

Probing laser-driven structure formation at extreme scales in space and time. (arXiv:2309.02971v1 [cond-mat.mtrl-sci])
Jörn Bonse, Klaus Sokolowski-Tinten

Irradiation of solid surfaces with high intensity, ultrashort laser pulses triggers a variety of secondary processes that can lead to the formation of transient and permanent structures over large range of length scales from mm down to the nano-range. One of the most prominent examples are LIPSS - Laser Induced Periodic Surface Structures. While LIPSS have been a scientific evergreen for of almost 60 years, experimental methods that combine ultrafast temporal with the required nm spatial resolution have become available only recently with the advent of short pulse, short wavelength free electron lasers. Here we discuss the current status and future perspectives in this field by exploiting the unique possibilities of these 4th-generation light sources to address by time-domain experimental techniques the fundamental LIPSS-question, namely why and how laser-irradiation can initiate the transition of a "chaotic" (rough) surface from an aperiodic into a periodic structure.

Excellent HER and OER Catalyzing Performance of Se-vacancies in Defects-engineering PtSe2: From Simulation to Experiment. (arXiv:2309.02973v1 [cond-mat.mtrl-sci])
Yuan Chang, Panlong Zhai, Jungang Hou, Jijun Zhao, Junfeng Gao

Facing with grave climate change and enormous energy demand, catalyzer gets more and more important due to its significant effect on reducing fossil fuels consumption. Hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by water splitting are feasible ways to produce clean sustainable energy. Here we systematically explored atomic structures and related STM images of Se defects in PtSe2. The equilibrium fractions of vacancies under variable conditions were detailly predicted. Besides, we found the vacancies are highly kinetic stable, without recovering or aggregation. The Se vacancies in PtSe2 can dramatically enhance the HER performance, comparing with, even better than Pt(111). Beyond, we firstly revealed that PtSe2 monolayer with Se vacancies is also a good OER catalyst. The excellent bipolar catalysis of Se vacancies were further confirmed by experimental measurements. We produced defective PtSe2 by direct selenization of Pt foil at 773 K using a CVD process. Then we observed the HER and OER performance of defective PtSe2 is much highly efficient than Pt foils by a series of measurements. Our work with compelling theoretical and experimental studies indicates PtSe2 with Se defects is an ideal bipolar candidate for HER and OER.

Topological Quantum Computation on a Chiral Kondo Chain. (arXiv:2309.03010v1 [cond-mat.str-el])
Tianhao Ren, Elio J. König, Alexei M. Tsvelik

We describe the chiral Kondo chain model based on the symplectic Kondo effect and demonstrate that it has a quantum critical ground state populated by non-Abelian anyons. We show that the fusion channel of two arbitrary anyons can be detected by locally coupling the two anyons to an extra single channel of chiral current and measuring the corresponding conductance at finite frequency. Based on such measurements, we propose that the chiral Kondo chain model with symplectic symmetry can be used for implementation of measurement-only topological quantum computations, and it possesses a number of distinct features favorable for such applications. The sources and effects of errors in the proposed system are analyzed, and possible material realizations are discussed.

Topological edge states in a Rydberg composite. (arXiv:2309.03039v1 [quant-ph])
Matthew T. Eiles, Christopher W. Wächtler, Alexander Eisfeld, Jan M. Rost

We examine topological phases and symmetry-protected electronic edge states in the context of a Rydberg composite: a Rydberg atom interfaced with a structured arrangement of ground-state atoms. The electronic Hamiltonian of such a composite possesses a direct mapping to a tight-binding Hamiltonian, which enables the realization and study of a variety of systems with non-trivial topology by tuning the arrangement of ground-state atoms and the excitation of the Rydberg atom. The Rydberg electron moves in a combined potential including the long-ranged Coulomb interaction with the Rydberg core and short-ranged interactions with each neutral atom; the effective interactions between sites are determined by this combination. We first confirm the existence of topologically-protected edge states in a Rydberg composite by mapping it to the paradigmatic Su-Schrieffer-Heeger dimer model. Following that, we study more complicated systems with trimer unit cells which can be easily simulated with a Rydberg composite.

Numerical analysis of voltage-controlled magnetization switching operation in magnetic-topological-insulator-based devices. (arXiv:2309.03043v1 [cond-mat.mes-hall])
Takashi Komine, Takahiro Chiba

We theoretically investigate influences of electronic circuit delay, noise and temperature on write-error-rate (WER) in voltage-controlled magnetization switching operation of a magnetic-topological-insulator-based (MTI) device by means of the micromagnetic simulation. This device realizes magnetization switching via spin-orbit torque(SOT) and voltage-controlled magnetic anisotropy (VCMA) which originate from 2D-Dirac electronic structure. We reveal that the device operation is extremely robust against circuit delay and signal-to-noise ratio. We demonstrate that the WER on the order of approximately $10^{-4}$ or below is achieved around room temperature due to steep change in VCMA. Also, we show that the larger SOT improves thermal stability factor. This study provides a next perspective for developing voltage-driven spintronic devices with ultra-low power consumption.

Tuning the flat bands by the interlayer interaction, spin-orbital coupling and electric field in twisted homotrilayer MoS$_2$. (arXiv:2309.03089v1 [cond-mat.mtrl-sci])
Yonggang Li, Zhen Zhan, Shengjun Yuan

Ultraflat bands have already been detected in twisted bilayer graphene (TBG) and twisted bilayer transition metal dichalcogenides (tb-TMDs), which provide a platform to investigate strong correlations. In this paper, the electronic properties of twisted trilayer molybdenum disulfide (TTM) are investigated via an accurate tight-banding Hamiltonian. We find that the highest valence bands are derived from $\Gamma$-point of the constituent monolayer, exhibiting a graphene-like dispersion or becoming isolated flat bands. The lattice relaxation, local deformation, and electric field can significantly tune the electronic structures of TTM with different starting stacking arrangements. After introducing the spin-orbital coupling (SOC) effect, we find a spin-valley-layer locking effect at the minimum of conduction band at K- and K$^\prime$-point of the Brillouin zone, which may provide a platform to study optical properties and magnetoelectric effects.

Surface reconstruction induced anisotropic energy landscape of bismuth monomers and dimers on the Si(001) surface. (arXiv:2309.03098v1 [cond-mat.mes-hall])
Haonan Huang, Christian Schön, Christian Ast

Spin qubits have attracted tremendous attention in the effort of building quantum computers over the years. Natural atomic scale candidates are group-V dopants in silicon, not only showing ultra-long lifetimes but also being compatible with current semiconductor technology. Nevertheless, bulk dopants are difficult to move with atomic precision, impeding the realization of desired structures for quantum computing. A solution is to place the atom on the surface which opens possibilities for atom level manipulations using scanning tunneling microscopy (STM). For this purpose, bismuth appears to be a good candidate. Here, we use ab-initio methods to study theoretically the adsorption of bismuth atoms on the Si(001) surface and investigate the adsorption sites and the transitions between them. We demonstrate the complex influence of the dimer row surface reconstruction on the energy landscape seen by a bismuth monomer and a dimer on the surface, and find anisotropic transition paths for movement on the surface. From a deposition simulation we obtain the expected occupation of adsorption sites. Our work lays the foundation for further application of bismuth atoms as qubits on silicon surfaces.

Majorana fermions and quantum information with fractional topology and disorder. (arXiv:2309.03127v1 [cond-mat.mes-hall])
Ephraim Bernhardt, Brian Chung Hang Cheung, Karyn Le Hur

The quest to identify and observe Majorana fermions in physics and condensed-matter systems remains an important challenge. Here, we introduce a qubit (spin-1/2) from the occurrence of two delocalized zero-energy Majorana fermions in a model of two spins-1/2 on the Bloch sphere within the fractional one-half topological state. We address specific protocols in time with circularly polarized light and the protection of this spin-1/2 state related to quantum information protocols. We also show how disorder can play a positive and important role allowing singlet-triplet transitions and resulting in an additional elongated region for the fractional phase, demonstrating the potential of this platform related to applications in topologically protected quantum information.

Magnetized Baryonic layer and a novel BPS bound in the gauged-Non-Linear-Sigma-Model-Maxwell theory in (3+1)-dimensions through Hamilton-Jacobi equation. (arXiv:2309.03153v1 [hep-th])
Fabrizio Canfora

It is show that one can derive a novel BPS bound for the gauged Non-Linear-Sigma-Model (NLSM) Maxwell theory in (3+1) dimensions which can actually be saturated. Such novel bound is constructed using Hamilton-Jacobi equation from classical mechanics. The configurations saturating the bound represent Hadronic layers possessing both Baryonic charge and magnetic flux. However, unlike what happens in the more common situations, the topological charge which appears naturally in the BPS bound is a non-linear function of the Baryonic charge. This BPS bound can be saturated when the surface area of the layer is quantized. The far-reaching implications of these results are discussed. In particular, we determine the exact relation between the magnetic flux and the Baryonic charge as well as the critical value of the Baryonic chemical potential beyond which these configurations become thermodynamically unstable.

Electrocaloric Response of the Dense Ferroelectric Nanocomposites. (arXiv:2309.03187v1 [])
Anna N. Morozovska, Oleksandr S. Pylypchuk, Serhii Ivanchenko, Eugene A. Eliseev, Hanna V. Shevliakova, Lubomir Korolevich, Lesya P. Yurchenko, Oleksandr V. Shyrokov, Nicholas V. Morozovsky, Vladimir N. Poroshin, Zdravko Kutnjak, Victor V. Vainberg

Using the Landau-Ginzburg-Devonshire approach and effective media models, we calculated the spontaneous polarization, dielectric, pyroelectric, and electrocaloric properties of BaTiO$_3$ core-shell nanoparticles. We predict that the synergy of size effects and Vegard stresses can significantly improve the electrocaloric cooling (2- 7 times) of the BaTiO$_3$ nanoparticles with diameters (10-100) nm stretched by (1-3)% in comparison with a bulk BaTiO$_3$. To compare with the proposed and other known models, we measured the capacitance-voltage and current-voltage characteristics of the dense nanocomposites consisting of (28 -35) vol.% of the BaTiO$_3$ nanoparticles incorporated in the poly-vinyl-butyral and ethyl-cellulose polymers covered by Ag electrodes. We determined experimentally the effective dielectric permittivity and losses of the dense composites at room temperature. According to our analysis, to reach the maximal electrocaloric response of the core-shell ferroelectric nanoparticles incorporated in different polymers, the dense composites should be prepared with the nanoparticles volume ratio of more than 25 % and fillers with low heat mass and conductance, such as Ag nanoparticles, which facilitate the heat transfer from the ferroelectric nanoparticles to the polymer matrix. In general, the core-shell ferroelectric nanoparticles spontaneously stressed by elastic defects, such as oxygen vacancies or any other elastic dipoles, which create a strong chemical pressure, are relevant fillers for electrocaloric nanocomposites suitable for advanced applications as nano-coolers.

Frustrated extended Bose-Hubbard model and deconfined quantum critical points with optical lattices at the anti-magic wavelength. (arXiv:2309.03193v1 [cond-mat.quant-gas])
Niccolò Baldelli, Cesar R. Cabrera, Sergi Julià-Farré, Monika Aidelsburger, Luca Barbiero

The study of geometrically frustrated many-body quantum systems is of central importance to uncover novel quantum mechanical effects. We design a scheme where ultracold bosons trapped in a one-dimensional state-dependent optical lattice are modeled by a frustrated Bose-Hubbard Hamiltonian. A derivation of the Hamiltonian parameters based on Cesium atoms, further show large tunability of contact and nearest-neighbour interactions. For pure contact repulsion, we discover the presence of two phases peculiar to frustrated quantum magnets: the bond-order-wave insulator with broken inversion symmetry and a chiral superfluid. When the nearest-neighbour repulsion becomes sizeable, a further density-wave insulator with broken translational symmetry can appear. We show that the phase transition between the two spontaneously-symmetry-broken phases is continuous, thus representing a one-dimensional deconfined quantum critical point not captured by the Landau-Ginzburg-Wilson symmetry-breaking paradigm. Our results provide a solid ground to unveil the novel quantum physics induced by the interplay of non-local interactions, geometrical frustration, and quantum fluctuations.

Graphite superlubricity enabled by triboinduced nanocontacts. (arXiv:2109.03172v2 [cond-mat.mes-hall] UPDATED)
Renato Buzio, Andrea Gerbi, Cristina Bernini, Luca Repetto, Andrea Vanossi

Colloidal probe Atomic Force Microscopy allows to explore sliding states of vanishing friction, i.e. superlubricity, in mesoscopic graphite contacts. Superlubricity is known to appear upon formation of a triboinduced transfer layer, originated by material transfer of graphene flakes from the graphitic substrate to the colloidal probe. Previous studies suggest that friction vanishes due to crystalline incommensurability at the newly formed interface. However this picture still lacks several details, such as the roles of the tribolayer roughness and of loading conditions. Hereafter we gain deeper insight into the tribological response of micrometric silica beads sliding on graphite under ambient conditions. We show that the tribotransferred flakes behave as lubricious nanoasperities with a twofold role. First, they decrease the silica-graphite true contact area, in fact causing a breakdown of adhesion and friction by one order of magnitude. Second, they govern mechanical dissipation through the specific energy landscape experienced by the topographically-highest triboinduced nanoasperity. Remarkably, such contact junctions can undergo a load-driven atomic-scale transition from continuous superlubric sliding to dissipative stick-slip, that agrees with the single-asperity Prandtl-Tomlinson model. Superlubricity in mesoscopic silica-graphite junctions may therefore arise from the load-controlled competition between interfacial crystalline incommensurability and contact pinning effects at one dominant nanoasperity.

Mechanisms of radiation-induced structural transformations in deposited gold clusters. (arXiv:2209.15481v2 [physics.atm-clus] UPDATED)
Alexey V. Verkhovtsev, Yury Erofeev, Andrey V. Solov'yov

Physical mechanisms of structural transformations in deposited metallic clusters exposed to an electron beam of a transmission electron microscope (TEM) are studied theoretically and computationally. Recent TEM experiments with size-selected Au$_{923}$ clusters softly deposited on a carbon substrate showed that the clusters undergo structural transformations from icosahedron to decahedron and face-center cubic (fcc) structures upon exposure to a 200-keV electron beam. In this paper, we demonstrate that the relaxation of collective electronic (plasmon) excitations formed in deposited metal clusters can induce the experimentally observed structural transformations. Such excitations in the clusters are formed mainly due to the interaction with low-energy secondary electrons emitted from a substrate. The characteristic occurrence times for plasmon-induced energy relaxation events are several orders of magnitude shorter than those for the momentum transfer events by energetic primary electrons to atoms of the cluster. The theoretical analysis is complemented by molecular dynamics simulations, which show that an icosahedral Au$_{923}$ cluster softly deposited on graphite is transformed into an fcc-like structure due to the vibrational excitation of the cluster.

Experimental Simulation of Symmetry-Protected Higher-Order Exceptional Points with Single Photons. (arXiv:2303.11834v2 [cond-mat.mes-hall] UPDATED)
Kunkun Wang, Lei Xiao, Haiqing Lin, Wei Yi, Emil J. Bergholtz, Peng Xue

Exceptional points (EPs) of non-Hermitian (NH) systems have recently attracted increasing attention due to their rich phenomenology and intriguing applications. Compared to the predominantly studied second-order EPs, higher-order EPs have been assumed to play a much less prominent role because they generically require the tuning of more parameters. Here we experimentally simulate two-dimensional topological NH band structures using single-photon interferometry, and observe topologically stable third-order EPs obtained by tuning only two real parameters in the presence of symmetry. In particular, we explore how different symmetries stabilize qualitatively different third-order EPs: the parity-time symmetry leads to a generic cube-root dispersion, while a generalized chiral symmetry implies a square-root dispersion coexisting with a flat band. Additionally, we simulate fourfold degeneracies, composed of the non-defective twofold degeneracies and second-order EPs. Our work reveals the abundant and conceptually richer higher-order EPs protected by symmetries and offers a versatile platform for further research on topological NH systems.

Systematic construction of topological-nontopological hybrid universal quantum gates based on many-body Majorana fermion interactions. (arXiv:2304.06260v2 [quant-ph] UPDATED)
Motohiko Ezawa

Topological quantum computation by way of braiding of Majorana fermions is not universal quantum computation. There are several attempts to make universal quantum computation by introducing some additional quantum gates or quantum states. However, there is an embedding problem that $M$-qubit gates cannot be embedded straightforwardly in $N$ qubits for $N>M$. This problem is inherent to the Majorana system, where logical qubits are different from physical qubits because braiding operations preserve the fermion parity. By introducing $2N$-body interactions of Majorana fermions, topological-nontopological hybrid universal quantum computation is shown to be possible. Especially, we make a systematic construction of the C$^{n}$Z gate, C$^{n}$NOT gate and the C$^{n}$SWAP gate.

Unified role of Green's function poles and zeros in topological insulators. (arXiv:2304.08180v2 [cond-mat.mes-hall] UPDATED)
Andrea Blason, Michele Fabrizio

Green's function zeros, which can emerge only if correlation is strong, have been for long overlooked and believed to be devoid of any physical meaning, unlike Green's function poles. Here, we prove that Green's function zeros instead contribute on the same footing as poles to determine the topological character of an insulator. The key to the proof, worked out explicitly in 2D but easily extendable in 3D, is to express the topological invariant in terms of a quasiparticle thermal Green's function matrix $G_*(i\epsilon,\mathbf{k})= 1/\big(i\epsilon-H_*(\epsilon,\mathbf{k})\big)$, with hermitian $H_*(\epsilon,\mathbf{k})$, by filtering out the positive definite quasiparticle residue. In that way, the topological invariant is easily found to reduce to the TKNN formula for quasiparticles described by the non-interacting Hamiltonian $H_*(0,\mathbf{k})$. Since the poles of the quasiparticle Green's function $G_*(\epsilon,\mathbf{k})$ on the real frequency axis correspond to poles and zeros of the physical-particle Green's function $G(\epsilon,\mathbf{k})$, both of them equally determine the topological character of an insulator.

Estimating Gibbs free energies via isobaric-isothermal flows. (arXiv:2305.13233v3 [physics.comp-ph] UPDATED)
Peter Wirnsberger, Borja Ibarz, George Papamakarios

We present a machine-learning model based on normalizing flows that is trained to sample from the isobaric-isothermal ensemble. In our approach, we approximate the joint distribution of a fully-flexible triclinic simulation box and particle coordinates to achieve a desired internal pressure. This novel extension of flow-based sampling to the isobaric-isothermal ensemble yields direct estimates of Gibbs free energies. We test our NPT-flow on monatomic water in the cubic and hexagonal ice phases and find excellent agreement of Gibbs free energies and other observables compared with established baselines.

Casimir-Lifshitz force between graphene-based structures out of thermal equilibrium. (arXiv:2305.18946v2 [cond-mat.mes-hall] UPDATED)
Youssef Jeyar, Kevin Austry, Minggang Luo, Brahim Guizal, H. B. Chan, Mauro Antezza

We study the non equilibrium Casimir-Lifshitz force between graphene-based parallel structures held at different temperatures and in presence of an external thermal bath at a third temperature. The graphene conductivity, which is itself a function of temperature, as well as of chemical potential, allows us to tune in situ the Casimir-Lifshitz force. We explore different non equilibrium configurations while considering different values of the graphene chemical potential. Particularly interesting cases are investigated, where the force can change sign going from attractive to repulsive or where the force becomes non monotonic with respect to chemical potential variations, contrary to the behaviour under thermal equilibrium.

Found 6 papers in prb
Date of feed: Thu, 07 Sep 2023 03:17:06 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)

Accurate and efficient structure factors in ultrasoft pseudopotential and projector augmented wave DFT
Benjamin X. Shi, Rebecca J. Nicholls, and Jonathan R. Yates
Author(s): Benjamin X. Shi, Rebecca J. Nicholls, and Jonathan R. Yates

Structure factors obtained from diffraction experiments are one of the most important quantities for characterizing the electronic and structural properties of materials. Methods for calculating this quantity from plane-wave density functional theory (DFT) codes are typically prohibitively expensive…

[Phys. Rev. B 108, 115112] Published Wed Sep 06, 2023

Olympicene radicals as building blocks of two-dimensional anisotropic networks
Ricardo Ortiz
Author(s): Ricardo Ortiz

I propose monoradical nanographenes without ${C}_{3}$ symmetry as building blocks to design two-dimensional carbon crystals. As representative examples I study the honeycomb and kagome lattices, showing that by replacing the sites with olympicene radicals the band dispersion near the Fermi energy co…

[Phys. Rev. B 108, 115113] Published Wed Sep 06, 2023

Structural diversity and topological property of I-based two-dimensional inorganic molecular crystals
Zhili Zhu, Jinhua Gu, Jiaqing Gao, Weiguang Chen, Chunyao Niu, Ping Cui, Yu Jia, and Zhenyu Zhang
Author(s): Zhili Zhu, Jinhua Gu, Jiaqing Gao, Weiguang Chen, Chunyao Niu, Ping Cui, Yu Jia, and Zhenyu Zhang

Two-dimensional inorganic molecular crystals (2D IMCs) consisting of compound molecules are emerging as a new branch of the 2D materials family. Based on first-principles calculations, here we propose a 2D IMC class assembled from diatomic molecules whose building blocks are derived from a single el…

[Phys. Rev. B 108, 115409] Published Wed Sep 06, 2023

Mobility edges through inverted quantum many-body scarring
N. S. Srivatsa, Hadi Yarloo, Roderich Moessner, and Anne E. B. Nielsen
Author(s): N. S. Srivatsa, Hadi Yarloo, Roderich Moessner, and Anne E. B. Nielsen

We show that the rainbow state, which has volume-law entanglement entropy for most choices of bipartitions, can be embedded in a many-body localized spectrum. For a broad range of disorder strengths in the resulting model, we numerically find a narrow window of highly entangled states in the spectru…

[Phys. Rev. B 108, L100202] Published Wed Sep 06, 2023

Exactly solvable lattice models for interacting electronic insulators in two dimensions
Qing-Rui Wang, Yang Qi, Chen Fang, Meng Cheng, and Zheng-Cheng Gu
Author(s): Qing-Rui Wang, Yang Qi, Chen Fang, Meng Cheng, and Zheng-Cheng Gu

Topological insulators in two-dimensional systems are well-understood within the context of free-fermion systems. Nevertheless, comprehending their strongly interacting counterparts presents a significant challenge. Here, the authors developed an innovative lattice model based on U(1)f fermionic charge decorations. The model furnishes a rigorous mathematical framework for delving into fermionic symmetry-protected topological phases that conserve U(1)f charge, among other types of symmetries. Notably, this research expands the existing theoretical landscape by presenting an exactly solvable Hamiltonian with a finite local Hilbert space and a sophisticated classification scheme for continuous symmetries.

[Phys. Rev. B 108, L121104] Published Wed Sep 06, 2023

Trapped photons: Transverse plasmons in layered semiconducting heterostructures
Neven Golenić and Vito Despoja
Author(s): Neven Golenić and Vito Despoja

We elucidate the properties of a robust transverse polarization mode in heterostructures of transition metal dichalcogenides. This trapped-photon mode arises from strong interband light-matter coupling, but its nature is fundamentally distinct from extensively studied exciton polaritons, as well as …

[Phys. Rev. B 108, L121402] Published Wed Sep 06, 2023

Found 2 papers in prl
Date of feed: Thu, 07 Sep 2023 03:17:04 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)

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

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

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

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

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

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

Found 1 papers in pr_res
Date of feed: Thu, 07 Sep 2023 03:17:06 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)

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

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

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

Found 1 papers in nano-lett
Date of feed: Wed, 06 Sep 2023 13:06:59 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)

[ASAP] Kinetics of Nanobubbles in Tiny-Angle Twisted Bilayer Graphene
Chao Yan, Ya-Xin Zhao, Yi-Wen Liu, and Lin He

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02286

Found 1 papers in acs-nano
Date of feed: Wed, 06 Sep 2023 13:03:48 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] Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene
Seyedamin Firouzeh, Sara Illescas-Lopez, Md Anik Hossain, Juan Manuel Cuerva, Luis Álvarez de Cienfuegos, and Sandipan Pramanik

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c06903

Found 2 papers in science-adv
Date of feed: Wed, 06 Sep 2023 19:08:16 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)

Magic-angle helical trilayer graphene
Trithep Devakul, Patrick J. Ledwith, Li-Qiao Xia, Aviram Uri, Sergio C. de la Barrera, Pablo Jarillo-Herrero, Liang Fu
Science Advances, Volume 9, Issue 36, September 2023.

Topological packing statistics of living and nonliving matter
Dominic J. Skinner, Hannah Jeckel, Adam C. Martin, Knut Drescher, Jörn Dunkel
Science Advances, Volume 9, Issue 36, September 2023.

Found 2 papers in nat-comm

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

Haldane topological spin-1 chains in a planar metal-organic framework
< author missing >

Stacking transfer of wafer-scale graphene-based van der Waals superlattices
< author missing >

Found 2 papers in comm-phys

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

Majorana corner states on the dice lattice
Elbio Dagotto

Communications Physics, Published online: 06 September 2023; doi:10.1038/s42005-023-01356-0

Higher order topological systems extend the features of topological insulators from gapless surfaces states to more exotic phenomena such as corner and hinge states. Here, the authors investigate the effect of topology on superconductivity in a dice lattice showing that it can house a second-order topological phase with mixed singlet-triplet pairing and zero-energy Majorana corner states.

Evidence of pseudogravitational distortions of the Fermi surface geometry in the antiferromagnetic metal FeRh
Matthew J. Gilbert

Communications Physics, Published online: 06 September 2023; doi:10.1038/s42005-023-01335-5

There are areas where high-energy and condensed-matter physics can successfully overlap a prominent example being topological matter and the role of supersymmetry. Here, via anisotropic magnetoresistance, the authors investigate distortions in the Fermi surface geometry of FeRh films and provide a theoretical interpretation that considers the results within the framework of a pseudogravitational fields.

Found 1 papers in scipost

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)

Restoration of the non-Hermitian bulk-boundary correspondence via topological amplification, by Matteo Brunelli, Clara C. Wanjura, Andreas Nunnenkamp
< author missing >
Submitted on 2023-09-06, refereeing deadline 2023-10-12.