Found 32 papers in cond-mat
Date of feed: Thu, 02 Nov 2023 00:30:00 GMT

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Classification of 1+1D gapless symmetry protected phases via topological holography. (arXiv:2311.00050v1 [cond-mat.str-el])
Rui Wen, Andrew C. Potter

Symmetry topological field theory (SymTFT) gives a holographic correspondence between systems with a global symmetry and a higher-dimensional topological field theory. In this framework, classification of gapped phases of matter in spacetime dimension 1+1D correspond to classifications of mechanisms to confine the SymTFT by condensing anyons. In this work, we extend these results to characterize gapless symmetry-protected topological states: symmetry-enriched gapless phases or critical points that exhibit edge modes protected by symmetry and topology. We establish a one-to-one correspondence between 1+1D bosonic gSPTs, and partially-confined boundaries of 2+1D SymTFTs. From general physical considerations, we determine the set of data and consistency conditions required to define a 1+1D gSPT, and show that this data precisely matches that of symmetry-preserving partial confinement (or partially gapped boundaries) of 2+1D quantum double models. We illustrate this correspondence through a dimensional reduction (thin-slab) construction, which enables a physically-intuitive derivation of how properties of the gSPT such as edge modes, emergent anomalies, and stability to perturbations arise from the SymTFT perspective.ditions required to define a 1+1D gSPT and show that they fully determine the physics of the gSPT including edge modes and emergent anomaly.

Dynamical characterization of $Z_{2}$ Floquet topological phases via quantum quenches. (arXiv:2311.00114v1 [cond-mat.quant-gas])
Lin Zhang

The complete characterization of Floquet topological phases is usually hard for the requirement of information about the micromotion throughout the entire driving period. Here we develop a full and feasible dynamical characterization theory for the $Z_{2}$ Floquet topological phases by quenching the system from a trivial and static initial state to the Floquet topological regime through suddenly changing the parameters and turning on the periodic driving. By measuring the minimal information of Floquet bands via the stroboscopic time-averaged spin polarizations, we show that the topological spin texture patterns emerging on certain discrete momenta of Brillouin zone called the $0$ or $\pi$ gap highest-order band-inversion surfaces provide a measurable dynamical $Z_{2}$ Floquet invariant, which uniquely determines the Floquet boundary modes in the corresponding quasienergy gap. The applications of our theory are illustrated via one- and two-dimensional models that are accessible in current quantum simulation experiments. Our work provides a highly feasible way to detect the $Z_{2}$ Floquet topological phases and shall advance the experimental studies.

Observing periodic gap variations in cuprates. (arXiv:2311.00178v1 [cond-mat.supr-con])
Riju Banerjee, Emily L. Wang, Eric W. Hudson

Central to the enigma of the cuprates is ubiquitous electronic inhomogeneity arising from a variety of electronic orders that coexist with superconductivity, the individual signatures of which have been impossible to disentangle despite four decades of intense research. This strong nanoscale inhomogeneity complicates interpretation of measurements both by probes which average over this inhomogeneity and those, like scanning tunneling microscopy (STM), which should be able to spatially resolve variations driven by both order and inhomogeneity. Here, we develop a novel technique that directly acknowledges this electronic inhomogeneity and extracts statistically significant features from scanning tunneling spectroscopic data. Applying our novel technique to single and bilayer Bi-based cuprates spanning a large doping range, we peer through local inhomogeneities and find that the gap breaks translational and rotational symmetries and varies periodically in a four-fold pattern. Our direct observation of a symmetry breaking gap in the single particle tunneling spectra adds strong credence to the pair density wave hypotheses supposed to exist in these materials. We also discuss various implications of our observations and, in particular, how they can explain the origin of the low energy checkerboard pattern.

Performance limits to graphene single-photon bolometers by thermal transport. (arXiv:2311.00228v1 [cond-mat.mes-hall])
Caleb Fried, B. Jordan Russell, Ethan G. Arnault, Bevin Huang, Gil-Ho Lee, Dirk Englund, Erik A. Henriksen, Kin Chung Fong

In high-sensitivity bolometers and calorimeters, the photon absorption often occurs at a finite distance from the temperature sensor to accommodate antennas or avoid the degradation of superconducting circuitry exposed to radiation. As a result, thermal propagation from the input to the temperature readout can critically affect detector performance. In this report we model the performance of a graphene bolometer, accounting for electronic thermal diffusion and dissipation via electron-phonon coupling at low temperatures in three regimes: clean, supercollision, and resonant scattering. Our results affirm the feasibility of a superconducting readout without Cooper-pair breaking by mid- and near-infrared photons, and provide a recipe for designing graphene absorbers for calorimetric single-photon detectors. We investigate the tradeoff between the input-readout distance and detector efficiency, and predict an intrinsic timing jitter of ~2.7 ps. Based on our result, we propose a spatial-mode-resolving photon detector to increase communication bandwidth.

Tuning of Berry Curvature Dipole in TaAs slabs: An effective Route to Enhance Nonlinear Hall Response. (arXiv:2311.00247v1 [cond-mat.mtrl-sci])
Hongsheng Pang, Gan Jin, Lixin He

In materials without inversion symmetry, Berry curvature dipole (BCD) arises from the uneven distribution of Berry curvature in momentum space. This leads to nonlinear anomalous Hall effects even in systems with preserved time-reversal symmetry. A key goal is to engineer systems with prominent BCD near the Fermi level. Notably, TaAs, a type-I Weyl semimetal, exhibits substantial Berry curvature but a small BCD around the Fermi level. In this study, we employed first-principles methods to comprehensively investigate the BCD in TaAs. Our findings reveal significant cancellation effects not only within individual Weyl points but crucially, among distinct Weyl point pairs in bulk TaAs. We propose a strategic approach to enhance the BCD in TaAs by employing a layer-stacking technique. This greatly amplifies the BCD compared to the bulk material. By tuning the number of slab layers, we can selectively target specific Weyl point pairs near the Fermi level, while quantum confinement effects suppress contributions from other pairs, mitigating cancellation effects. Especially, the BCD of an 8-layer TaAs slab surpasses the bulk value near the Fermi level by orders of magnitude.

Tunable p-n junction barriers in few-electron bilayer graphene quantum dots. (arXiv:2311.00250v1 [cond-mat.mes-hall])
Fang-Ming Jing, Guo-Quan Qin, Zhuo-Zhi Zhang, Xiang-Xiang Song, Guo-Ping Guo

Graphene quantum dots provide promising platforms for hosting spin, valley, or spin-valley qubits. Taking advantage of the electrically generated band gap and the ambipolar nature, high-quality quantum dots can be defined in bilayer graphene using natural p-n junctions as tunnel barriers. In these devices, demonstrating the electrical tunability of the p-n junction barriers and understanding its physical mechanism, especially in the few-electron regime, are essential for further manipulating electron's quantum degrees of freedom to encode qubits. Here, we show the electrostatic confinement of single quantum dots in bilayer graphene using natural p-n junctions. When the device is operated in the few-electron regime, the electron tunneling rate is found to be monotonically tuned by varying gate voltages, which can be well understood from the view of manipulating the p-n junction barriers. Our results provide an insightful understanding of electrostatic confinement using natural p-n junctions in bilayer graphene, which is beneficial for realizing graphene-based qubits.

Topological transport of vorticity on curved magnetic membranes. (arXiv:2311.00323v1 [cond-mat.mes-hall])
Chau Dao, Ji Zou, Eric Kleinherbers, Yaroslav Tserkovnyak

In this work, we study the transport of vorticity on curved dynamical two-dimensional magnetic membranes. We find that topological transport can be controlled by geometrically reducing symmetries, which enables processes that are not present in flat magnetic systems. To this end, we construct a vorticity 3-current which obeys a continuity equation. This continuity equation is immune to local fluctuations of the magnetic texture as well as spatiotemporal fluctuations of the membrane. We show how electric current can manipulate vortex transport in geometrically nontrivial magnetic systems. As an illustrative example, we propose a minimal setup that realizes an experimentally feasible energy storage device.

Correlation-induced Fermi surface evolution and topological crystalline superconductivity in CeRh2As2. (arXiv:2311.00324v1 [cond-mat.supr-con])
Jun Ishizuka, Kosuke Nogaki, Manfred Sigrist, Youichi Yanase

Locally noncentrosymmetric structures in crystals are attracting much attention owing to emergent phenomena associated with the sublattice degree of freedom. The newly discovered heavy fermion superconductor CeRh$_2$As$_2$ is considered to be an excellent realization of this class. Angle-resolved photoemission spectroscopy experiments recently observed low-energy spectra of electron and hole bands and characteristic Van Hove singularities, stimulating us to explore the electronic correlation effect on the band structure. In this Letter, we theoretically study the electronic state and topological superconductivity from first principles. Owing to the Coulomb repulsion $U$ of Ce 4$f$ electrons, the low-energy band structure is modified in accordance with the experimental result. We show that Fermi surfaces change significantly from a complicated three-dimensional structure to a simple two-dimensional one. Fermi surface formulas for one-dimensional $\mathbb{Z}_2$ invariants in class D indicate topological crystalline superconductivity protected by the glide symmetry in a broad region for $U$. The classification of superconducting gap structure reveals topologically protected excitation gap and node. Our findings of the correlation-induced evolution of electronic structure provide a basis to clarify the unusual phase diagram of CeRh$_2$As$_2$ including superconductivity, magnetic order, and quadrupole density wave, and accelerate the search for topological superconductivity in strongly correlated electron systems.

Transport and electrical properties of cryogenic thermoelectric FeSb2: the effect of isoelectronic and hole doping. (arXiv:2311.00326v1 [cond-mat.mtrl-sci])
Deepak Gujjar, Sunidhi Gujjar, V. K. Malik, Hem C. Kandpal

Thermoelectric materials operating at cryogenic temperatures are in high demand for efficient cooling and power generation in applications ranging from superconductors to quantum computing. The narrow band-gap semiconductor FeSb2, known for its colossal Seebeck coefficient, holds promise for such applications, provided its thermal conductivity value can be reduced. This study investigates the impact of isoelectronic substitution (Bi) and hole doping (Pb) at the Sb site on the transport properties of FeSb2, with a particular focus on thermal conductivity (\k{appa}). Polycrystalline FeSb2 powder, along with Bi- and Pb-doped samples, were synthesized using a simple co-precipitation approach, followed by thermal treatment in an H2 atmosphere. XRD and SEM analysis confirms the formation of the desired phase pre- and post-consolidation using spark plasma sintering (SPS). The consolidation process resulted in a high compaction density and the formation of submicrometer-sized grains, as substantiated by electron backscattered diffraction (EBSD) analysis. Substituting 1% of Bi and Pb at the Sb site successfully suppressed the thermal conductivity (\k{appa}) from ~15 W/m-K in pure FeSb2 to ~10 and ~8.7 W/m-K, respectively. Importantly, resistivity measurements revealed a metal-to-insulator transition at around 6.5 K in undoped FeSb2 and isoelectronically Bi-substituted FeSb2, suggesting the existence of metallic surface states and provides valuable evidence for the perplexing topological behavior exhibited by FeSb2.

Engineering of Chern number of topological bands in bilayer graphene by in-plane magnetic field and electrical bias. (arXiv:2311.00331v1 [cond-mat.mes-hall])
Narjes Kheirabadi

Based on the full Hamiltonian of bilayer graphene, phase transitions are realized by the change of the in-plane magnetic field and the electrical bias in bilayer graphene. We show that the engineering of Chern numbers of four bands is possible by an applied in-plane magnetic field and an electrical bias in bilayer graphene. Our results are promising for the exploration of new topological phenomena in 2D materials.

Two-dimensional double-kagome-lattice nitrogene: a direct band gap semiconductor with nontrivial corner state. (arXiv:2311.00340v1 [cond-mat.mtrl-sci])
Wenzhang Li, Qin He, Xiao-Ping Li, Da-Shuai Ma, Botao Fu

Based on first-principles calculations, we predict that nitrogen atoms can assemble into a single-layer double kagome lattice (DKL), which possesses the characteristics of an intrinsic direct band gap semiconductor, boasting a substantial band gap of 3.460 eV. The DKL structure results in a flat valence band with high effective mass and a conduction band with small effective mass comes from Dirac electrons. These distinctive band edges lead to a significant disparity in carrier mobilities, with electron mobility being four orders of magnitude higher than that of holes. The presence of flat band in DKL-nitrogene can be further discerned through the enhanced optical absorption and correlated effects as exemplified by hole-induced ferromagnetism. Interestingly, DKL-nitrogene exhibits inherent second-order topological states, confirmed by a non-trivial second Stiefel-Whitney number and the presence of 1D floating edge states and 0D corner states within the bulk band gap. Additionally, the robust N-N bonds and the lattice's bending structure ensure thermodynamic stability and mechanical stiffness. These attributes make it exceptionally stable for potential applications in nano-devices.

The Casimir Force between Two Graphene Sheets: 2D Fresnel Reflection Coefficients, Contributions of Different Polarizations, and the Role of Evanescent Waves. (arXiv:2311.00363v1 [quant-ph])
Galina L. Klimchitskaya, Vladimir M. Mostepanenko

We consider the Casimir pressure between two graphene sheets and contributions to it determined by evanescent and propagating waves with different polarizations. For this purpose, the derivation of the 2-dimensional (2D) Fresnel reflection coefficients on a graphene sheet is presented in terms of the transverse and longitudinal dielectric permittivities of graphene with due account of the spatial dispersion. The explicit expressions for both dielectric permittivities as the functions of the 2D wave vector, frequency, and temperature are written along the real frequency axis in the regions of propagating and evanescent waves and at the pure imaginary Matsubara frequencies using the polarization tensor of graphene. It is shown that in the application region of the Dirac model nearly the total value of the Casimir pressure between two graphene sheets is determined by the electromagnetic field with transverse magnetic (TM) polarization. By using the Lifshitz formula written along the real frequency axis, the contributions of the TM-polarized propagating and evanescent waves into the total pressure are determined. By confronting these results with the analogous results found for plates made of real metals, the way for bringing the Lifshitz theory using the realistic response functions in agreement with measurements of the Casimir force between metallic test bodies is pointed out.

Characterization of the 2D Su-Schrieffer-Heeger Model with Second-Nearest-Neighbor Interactions. (arXiv:2311.00427v1 [cond-mat.mtrl-sci])
Chani Stella van Niekerk, Robert Warmbier

It is known that a two dimensional dimerized Su-Schrieffer-Heeger model can produce a nontrivial topological phase. It is a simple nearest-neighbor model with either two or four lattice sites in in two dimensions. Su-Schrieffer-Heeger model is easy to analyse but neglects important interaction in physical systems. In this work, an extended version of this model is proposed which includes all possible second nearest neighbor interactions in order to make it more feasible to describe realistic systems. The topological phases and properties of the model are characterized using a polarization invariant. It is further shown that second nearest neighbor interactions can be used to evoke a topological phase transition as well.

A complementary experimental study of epitaxial La0.67Sr0.33MnO3 to identify morphological and chemical disorder. (arXiv:2311.00504v1 [cond-mat.mtrl-sci])
Michael Verhage, Emma van der Minne, Ellen M. Kiens, Lucas Korol, Raymond J. Spiteri, Gertjan Koster, Robert J. Green, Christoph Baeumer, Kees Flipse

Gaining insight into the characteristics of epitaxial complex oxide films is essential to control the behavior of devices and catalytic processes. It is known that substrate induced strain, doping, and layer growth can affect the electronic and magnetic properties of the film's bulk. In this study, we demonstrate a clear distinction between the bulk and surface of thin films of La0.67Sr0.33MnO3 in terms of chemical composition, electronic disorder, and surface morphology. We employed a combined experimental approach of X-ray based characterization methods and scanning probe microscopy. X-ray diffraction and resonant X-ray reflectivity revealed surface non-stochiometry in the strontium and lanthanum, as well as an accumulation of oxygen vacancies. Scanning tunneling microscopy showed a staggered growth surface morphology accompanied by an electronic phase separation (EPS) related to this non-stochiometry. The EPS is likely responsible for the temperature-dependent resistivity transition and is a cause of a proposed mixed-phase ferromagnetic and paramagnetic state near room temperature in these thin films.

Critical current throughout the BCS-BEC crossover with the inclusion of pairing fluctuations. (arXiv:2311.00540v1 [cond-mat.supr-con])
Leonardo Pisani, Verdiana Piselli, Giancarlo Calvanese Strinati

The present work aims at providing a systematic analysis of the current density versus momentum characteristics for a fermionic superfluid throughout the BCS-BEC crossover, even in the fully homogeneous case. At low temperatures, where pairing fluctuations are not strong enough to invalidate a quasi-particle approach, a sharp threshold for the inception of a back-flow current is found, which sets the onset of dissipation and identifies the critical momentum according to Landau. This momentum is seen to smoothly evolve from the BCS to the BEC regimes, whereby a single expression for the single-particle current density that includes pairing fluctuations enables us to incorporate on equal footing two quite distinct dissipative mechanisms, namely, pair-breaking and phonon excitations in the two sides of the BCS-BEC crossover, respectively. At finite temperature, where thermal fluctuations broaden the excitation spectrum and make the dissipative (kinetic and thermal) mechanisms intertwined with each other, an alternative criterion due to Bardeen is instead employed to signal the loss of superfluid behavior. In this way, detailed comparison with available experimental data in linear and annular geometries is significantly improved with respect to previous approaches, thereby demonstrating the crucial role played by quantum fluctuations in renormalizing the single-particle excitation spectrum.

Room temperature electroluminescence from isolated colour centres in van der Waals semiconductors. (arXiv:2311.00549v1 [cond-mat.mes-hall])
Gyuna Park, Ivan Zhigulin, Hoyoung Jung, Jake Horder, Karin Yamamura, Yerin Han, Kenji Watanabe, Takashi Taniguchi, Igor Aharonovich, Jonghwan Kim

Defects in wide bandgap semiconductors have recently emerged as promising candidates for solid-state quantum optical technologies. Electrical excitation of emitters may pave the way to scalable on-chip devices, and therefore is highly sought after. However, most wide band gap materials are not amenable to efficient doping, which in turn poses challenges on efficient electrical excitation and on-chip integration. Here, we demonstrate for the first time room temperature electroluminescence from isolated colour centres in hexagonal boron nitride (hBN). We harness the van der Waals (vdW) structure of two-dimensional materials, and engineer nanoscale devices comprised of graphene - hBN - graphene tunnel junctions. Under an applied bias, charge carriers are injected into hBN, and result in a localised light emission from the hBN colour centres. Remarkably, our devices operate at room temperature and produce robust, narrowband emission spanning a wide spectral range - from the visible to the near infrared. Our work marks an important milestone in van der Waals materials and their promising attributes for integrated quantum technologies and on-chip photonic circuits.

Electric Fields Near Undulating Dielectric Membranes. (arXiv:2311.00570v1 [cond-mat.soft])
Nicholas Pogharian, Alexandre P. dos Santos, Monica Olvera de la Cruz

Dielectric interfaces are crucial to the behavior of charged membranes, from graphene to synthetic and biological lipid bilayers. Understanding electrolyte behavior near these interfaces remains a challenge, especially in the case of rough dielectric surfaces. A lack of analytical solutions consigns this problem to numerical treatments. We report an analytic method for determining electrostatic potentials near curved dielectric membranes in a two-dimensional periodic 'slab' geometry using a periodic summation of Green's functions. This method is amenable to simulating arbitrary groups of charges near surfaces with two-dimensional deformations. We concentrate on one-dimensional undulations. We show that increasing membrane undulation increases the asymmetry of interfacial charge distributions due to preferential ionic repulsion from troughs. In the limit of thick membranes we recover results mimicking those for electrolytes near a single interface. Our work demonstrates that rough surfaces generate charge patterns in electrolytes of charged molecules or mixed-valence ions.

Theoretical Investigation of Samarium Hexaboride. (arXiv:2311.00583v1 [cond-mat.mes-hall])
Partha Goswami, Udai Prakash Tyagi

We investigate the periodic Anderson model of the bulk samarium hexaboride in the slave-boson framework assuming the presence of ferromagnetic impurities. Our analysis provides a strong evidence that the system is in the quantum anomalous Hall phase when the exchange interaction is not zero. Thereafter, we show that the bulk samarium hexaboride is a strong topological insulator calculating Z2 invariant using the Fu-Kane-Mele formalism.

Large deviations and conditioning for chaotic non-invertible deterministic maps: analysis via the forward deterministic dynamics and the backward stochastic dynamics. (arXiv:2311.00593v1 [cond-mat.stat-mech])
Cecile Monthus

The large deviations properties of trajectory observables for chaotic non-invertible deterministic maps as studied recently by N. R. Smith, Phys. Rev. E 106, L042202 (2022) and by R. Gutierrez, A. Canella-Ortiz, C. Perez-Espigares, arXiv:2304.13754 are revisited in order to analyze in detail the similarities and the differences with the case of stochastic Markov chains. To be concrete, we focus on the simplest example displaying the two essential properties of local-stretching and global-folding, namely the doubling map $ x_{t+1} = 2 x_t [\text{mod} 1] $ on the real-space interval $x \in [0,1[$ that can be also analyzed via the decomposition $x= \sum_{l=1}^{+\infty} \frac{\sigma_l}{2^l} $ into binary coefficients $\sigma_l=0,1$. The large deviations properties of trajectory observables can be studied either via deformations of the forward deterministic dynamics or via deformations of the backward stochastic dynamics. Our main conclusions concerning the construction of the corresponding Doob canonical conditioned processes are: (i) non-trivial conditioned dynamics can be constructed only in the backward stochastic perspective where the reweighting of existing transitions is possible, and not in the forward deterministic perspective ; (ii) the corresponding conditioned steady state is not smooth on the real-space interval $x \in [0,1[$ and can be better characterized in the binary space $\sigma_{l=1,2,..,+\infty}$. As a consequence, the backward stochastic dynamics in the binary space is also the most appropriate framework to write the explicit large deviations at level 2 for the probability of the empirical density of long backward trajectories.

Crystalline topological defects within response theory. (arXiv:2311.00698v1 [cond-mat.str-el])
Sami Hakani, Itamar Kimchi

Lattice defects have interesting effects in some quantum Hamiltonians. Here we show how topological crystalline defects can produce qualitatively new effects by coupling to electric field probes such as Raman scattering, even when they do not appear in the low-energy Hamiltonian but rather only in the probe response theory. To show this we consider an antiferromagnetic spin-1/2 model $H_{spin}$ on a zigzag chain. Crystalline domain walls between two zigzag domains appear as at most local defects in $H_{spin}$, but as topological (not locally creatable) defects in the Raman operator $R$ of inelastic photon scattering. Using TEBD numerics, bosonization, and mean field, we show that a finite density of crystalline domain walls shifts the entire Raman signal to produce an effective gap. This lattice-defect-induced Raman gap closes and reopens in applied magnetic fields. We discuss the effect in terms of photons sensing the lattice defects within $R$ as spin-dimerization domain walls, with $Z_2$ character, and a resulting shift of the probed wavevector from $q=0$ to $\pi+\delta q$, giving an $\textit{O}(1)$ change in contrast to local defects. The magneto-Raman singularity from topological lattice defects here relies on the $H_{spin}$ spinon liquid state, suggesting future applications using lattice topological defects to modify response-theory operators independently of $H$ and thereby generate new probes of quantum phases.

Differential models for the Anderson dual to bordism theories and invertible QFT's, I. (arXiv:2106.09270v3 [math.AT] UPDATED)
Mayuko Yamashita, Kazuya Yonekura

In this paper, we construct new models for the Anderson duals $(I\Omega^G)^*$ to the stable tangential $G$-bordism theories and their differential extensions. The cohomology theory $(I\Omega^G)^*$ is conjectured by Freed and Hopkins [FH21] to classify deformation classes of possibly non-topological invertible quantum field theories (QFT's). Our model is made by abstractizing certain properties of invertible QFT's, thus supporting their conjecture.

Antimonene with Topological Nontrivial Band Structure on Al(111) Substrate. (arXiv:2112.05424v2 [cond-mat.mtrl-sci] UPDATED)
Wang Yang

The large area of high-quality Honeycomb lattice and Kagome lattice of antimony structure can be formed automatically on Al(111) substrate in room temperature by molecular beam epitaxy(MBE).Different phases occured with the increased of deposition time can be investigated by scanning tunneling microscopy(STM) combined with high electron energy diffractometer(RHEED),and the changes of each components are characterlized by x-ray photoelectron spectroscopy(XPS).The 2D topological edge state of antimonene can be measured by angle resolved photoemission spectroscopy(ARPES) in experimental,and the electronic structures are further verified by the caculation of first-principles density functional theory(DFT).

Higher Gauging and Non-invertible Condensation Defects. (arXiv:2204.02407v3 [hep-th] UPDATED)
Konstantinos Roumpedakis, Sahand Seifnashri, Shu-Heng Shao

We discuss invertible and non-invertible topological condensation defects arising from gauging a discrete higher-form symmetry on a higher codimensional manifold in spacetime, which we define as higher gauging. A $q$-form symmetry is called $p$-gaugeable if it can be gauged on a codimension-$p$ manifold in spacetime. We focus on 1-gaugeable 1-form symmetries in general 2+1d QFT, and gauge them on a surface in spacetime. The universal fusion rules of the resulting invertible and non-invertible condensation surfaces are determined. In the special case of 2+1d TQFT, every (invertible and non-invertible) 0-form global symmetry, including the $\mathbb{Z}_2$ electromagnetic symmetry of the $\mathbb{Z}_2$ gauge theory, is realized from higher gauging. We further compute the fusion rules between the surfaces, the bulk lines, and lines that only live on the surfaces, determining some of the most basic data for the underlying fusion 2-category. We emphasize that the fusion "coefficients" in these non-invertible fusion rules are generally not numbers, but rather 1+1d TQFTs. Finally, we discuss examples of non-invertible symmetries in non-topological 2+1d QFTs such as the free $U(1)$ Maxwell theory and QED.

Topological Defects in Floquet Circuits. (arXiv:2206.06272v2 [cond-mat.str-el] UPDATED)
Mao Tian Tan, Yifan Wang, Aditi Mitra

We introduce a Floquet circuit describing the driven Ising chain with topological defects. The corresponding gates include a defect that flips spins as well as the duality defect that explicitly implements the Kramers-Wannier duality transformation. The Floquet unitary evolution operator commutes with such defects, but the duality defect is not unitary, as it projects out half the states. We give two applications of these defects. One is to analyze the return amplitudes in the presence of "space-like" defects stretching around the system. We verify explicitly that the return amplitudes are in agreement with the fusion rules of the defects. The second application is to study unitary evolution in the presence of "time-like" defects that implement anti-periodic and duality-twisted boundary conditions. We show that a single unpaired localized Majorana zero mode appears in the latter case. We explicitly construct this operator, which acts as a symmetry of this Floquet circuit. We also present analytic expressions for the entanglement entropy after a single time step for a system of a few sites, for all of the above defect configurations.

Emergent One-Dimensional Helical Channel in Higher-Order Topological Insulators with Step Edges. (arXiv:2206.15206v4 [cond-mat.mes-hall] UPDATED)
Akihiko Sekine, Manabu Ohtomo, Kenichi Kawaguchi, Mari Ohfuchi

We study theoretically the electronic structure of three-dimensional (3D) higher-order topological insulators in the presence of step edges. We numerically find that a 1D conducting state with a helical spin structure, which also has a linear dispersion near the zero energy, emerges at a step edge and on the opposite surface of the step edge. We also find that the 1D helical conducting state on the opposite surface of a step edge emerges when the electron hopping in the direction perpendicular to the step is weak. In other words, the existence of the 1D helical conducting state on the opposite surface of a step edge can be understood by considering an addition of two different-sized independent blocks of 3D higher-order topological insulators. On the other hand, when the electron hopping in the direction perpendicular to the step is strong, the location of the emergent 1D helical conducting state moves from the opposite surface of a step edge to the dip ($270^{\circ}$ edge) just below the step edge. In this case, the existence at the dip below the step edge can be understood by assigning each surface with a sign ($+$ or $-$) of the mass of the surface Dirac fermions. These two physical pictures are connected continuously without the bulk bandgap closing. Our finding paves the way for on-demand creation of 1D helical conducting states from 3D higher-order topological insulators employing experimental processes commonly used in thin-film devices, which could lead to, e.g., a realization of high-density Majorana qubits.

One, two, three, $\ldots$ infinity: topological properties of thin films of $\rm Co$-based shandite. (arXiv:2212.09026v2 [cond-mat.str-el] UPDATED)
Kazuki Nakazawa, Yasuyuki Kato, Yukitoshi Motome

The kagome ferromagnet, $\rm Co$-based shandite $\rm Co_{3}Sn_{2}S_{2}$, shows a large anomalous Hall effect (AHE) associated with the Weyl nodes. A thin film with a $\rm Co$ kagome monolayer was predicted to exhibit the quantum AHE, which awaits the experimental realization. However, since the Weyl nodes are the topological singularities unique to bulk, it is unclear how they reside while the film thickness is reduced. Moreover, it is challenging to precisely predict the band topology of thin films where the lattice and electronic structures are in general different from the bulk. Here we report the $ab \ initio$ results for thin films of $\rm Co_{3}Sn_{2}S_{2}$ with one, two and three $\rm Co$ layers with $\rm Sn$ or $\rm S$ surface terminations, with special attention to the optimization of lattice structure and magnetism. We find that all the $\rm Sn$-end films stabilize a ferromagnetic state similar to the bulk, and retain the large AHE down to the monolayer limit where the AHE is quantized. In contrast, in the $\rm S$-end films, the magnetic state varies with the number of $\rm Co$ layers, which drastically changes the topological properties, including an interlayer antiferromagnetic state with zero AHE in the bilayer case. Our results would stimulate further experimental exploration of thin Weyl materials.

Universal lower bound on topological entanglement entropy. (arXiv:2302.00689v2 [quant-ph] UPDATED)
Isaac H. Kim, Michael Levin, Ting-Chun Lin, Daniel Ranard, Bowen Shi

Entanglement entropies of two-dimensional gapped ground states are expected to satisfy an area law, with a constant correction term known as the topological entanglement entropy (TEE). In many models, the TEE takes a universal value that characterizes the underlying topological phase. However, the TEE is not truly universal: it can differ even for two states related by constant-depth circuits, which are necessarily in the same phase. The difference between the TEE and the value predicted by the anyon theory is often called the spurious topological entanglement entropy. We show that this spurious contribution is always nonnegative, thus the value predicted by the anyon theory provides a universal lower bound. This observation also leads to a definition of TEE that is invariant under constant-depth quantum circuits.

Predicting Polymer Brush Behavior in Solvents using the Steepest-Entropy-Ascent Quantum Thermodynamic Framework. (arXiv:2304.04105v2 [cond-mat.soft] UPDATED)
Jared McDonald, Michael R. von Spakovsky, William T. Reynolds Jr

The steepest-entropy-ascent quantum thermodynamic (SEAQT) framework is utilized to study the effects of temperature on polymer brushes. The brushes are represented by a discrete energy spectrum and energy degeneracies obtained through the Replica-Exchange Wang-Landau algorithm. The SEAQT equation of motion is applied to the density of states to establish a unique kinetic path from an initial thermodynamic state to a stable equilibrium state. The kinetic path describes the brush's evolution in state space as it interacts with a thermal reservoir. The predicted occupation probabilities along the kinetic path are used to determine expected thermodynamic and structural properties. The polymer density profile of a polystyrene brush in cyclohexane solvent is predicted using the equation of motion, and it agrees qualitatively with experimental density profiles. The Flory-Huggins parameter chosen to describe brush-solvent interactions affects the solvent distribution in the brush but has minimal impact on the polymer density profile. Three types of non-equilibrium kinetic paths with differing amounts of entropy production are considered: a heating path, a cooling path, and a heating-cooling path. Properties such as tortuosity, radius of gyration, brush density, solvent density, and brush chain conformations are calculated for each path.

Dynamical self-trapping of two-dimensional binary solitons in cross-combined linear and nonlinear optical lattices. (arXiv:2305.03438v2 [nlin.PS] UPDATED)
K.K. Ismailov, G.A. Sekh, Mario Salerno

Dynamical and self-trapping properties of two-dimensional (2D) binary mixtures of Bose-Einstein condensates (BECs) in cross-combined lattices consisting of a one-dimensional (1D) linear optical lattice (LOL) in the $x-$ direction for the first component and a 1D non linear optical lattice (NOL) in the $y$-direction for the second component, are analytically and numerically investigated. The existence and stability of 2D binary matter wave solitons in these settings is demonstrated both by variational analysis and by direct numerical integration of the coupled Gross-Pitaevskii equations (GPE). We find that in absence of the NOL binary solitons, stabilised by the action of the 1D LOL and by the attractive inter-component interaction can freely move in the $y-$direction. In the presence of the NOL we find, quite remarkably, the existence of threshold curves in the parameter space separating regions where solitons can move, from regions where the solitons become dynamically self-trapped. The mechanism underlying the dynamical self-trapping phenomenon (DSTP) is qualitatively understood in terms of a dynamical barrier induced by the the NOL similar to the Peirls-Nabarro barrier of solitons in discrete lattices. DSTP is numerically demonstrated for binary solitons that are put in motion both by phase imprinting and by the action of external potentials applied in the $y-$direction. In the latter case we show that the trapping action of the NOL allows maintaining a 2D binary soliton at rest in a non-equilibrium position of a parabolic trap, or to prevent it from falling under the action of gravity. Possible applications of the results are also briefly discussed.

Lieb-Schultz-Mattis anomalies as obstructions to gauging (non-on-site) symmetries. (arXiv:2308.05151v2 [cond-mat.str-el] UPDATED)
Sahand Seifnashri

We study 't Hooft anomalies of global symmetries in 1+1d lattice Hamiltonian systems. We consider anomalies in internal and lattice translation symmetries. We derive a microscopic formula for the "anomaly cocycle" using topological defects implementing twisted boundary conditions. The anomaly takes value in the cohomology group $H^3(G,U(1)) \times H^2(G,U(1))$. The first factor captures the anomaly in the internal symmetry group $G$, and the second factor corresponds to a generalized Lieb-Schultz-Mattis anomaly involving $G$ and lattice translation. We present a systematic procedure to gauge internal symmetries (that may not act on-site) on the lattice. We show that the anomaly cocycle is the obstruction to gauging the internal symmetry while preserving the lattice translation symmetry. As an application, we construct anomaly-free chiral lattice gauge theories. We demonstrate a one-to-one correspondence between (locality-preserving) symmetry operators and topological defects, which is essential for the results we prove. We also discuss the generalization to fermionic theories. Finally, we construct non-invertible lattice translation symmetries by gauging internal symmetries with a Lieb-Schultz-Mattis anomaly.

Efficient Quantum Transduction Using Anti-Ferromagnetic Topological Insulators. (arXiv:2308.09048v2 [cond-mat.mtrl-sci] UPDATED)
Haowei Xu, Changhao Li, Guoqing Wang, Hao Tang, Paola Cappellaro, Ju Li

Transduction of quantum information between distinct quantum systems is an essential step in various applications, including quantum networks and quantum computing. However, mediating photons of vastly different frequencies and designing high-performance transducers are challenging, due to multifaceted and sometimes conflicting requirements. In this work, we first discuss some general principles for quantum transducer design, and then propose solid-state anti-ferromagnetic topological insulators to serve as highly effective transducers. First, topological insulators exhibit band-inversion, which can greatly enhance their optical responses. This property, coupled with robust spin-orbit coupling and high spin density, results in strong nonlinear interaction in magnetic topological insulators, thereby substantially improving transduction efficiency. Second, the anti-ferromagnetic order can minimize the detrimental influence on other neighboring quantum systems due to magnetic interactions. Using MnBi2Te4 as an example, we showcase that single-photon quantum transduction efficiency exceeding 80% can be achieved with modest experimental requirements, while the transduction bandwidth can reach the GHz range. The strong nonlinear photonic interactions in magnetic topological insulators can find diverse applications, including the generation of entanglement between photons of disparate frequencies and quantum squeezing.

Symmetry-breaking pathway towards the unpinned broken helix. (arXiv:2310.16018v2 [cond-mat.str-el] UPDATED)
E. Donoway, T. V. Trevisan, A. Liebman - Peláez, R. P. Day, K. Yamakawa, Y. Sun, J. R. Soh, D. Prabhakaran, A. T. Boothroyd, R. M. Fernandes, J. G. Analytis, J. E. Moore, J. Orenstein, V. Sunko

One of the prime material candidates to host the axion insulator state is EuIn$_{2}$As$_{2}$. First-principles calculations predicted the emergence of this exotic topological phase based on the assumption of a collinear antiferromagnetic structure. However, neutron scattering measurements revealed a more intricate magnetic ground state, characterized by two coexisting magnetic wavevectors, reached by successive thermal phase transitions. The proposed high and low temperature phases were a spin helix and a state with interpenetrating helical and antiferromagnetic order, termed a broken helix, respectively. Despite its complexity, the broken helix still protects the axion state because the product of time-reversal and a rotational symmetry is preserved. Here we identify the magnetic structure associated with these two phases using a multimodal approach that combines symmetry-sensitive optical probes, scattering, and group theoretical analysis. We find that the higher temperature phase hosts a nodal structure rather than a helix, characterized by a variation of the magnetic moment amplitude from layer to layer, with the moment vanishing entirely in every third Eu layer. The lower temperature structure is similar to the broken helix, with one important difference: the relative orientation of the magnetic structure and the lattice is not fixed, resulting in an `unpinned broken helix'. As a result of the breaking of rotational symmetry, the axion phase is not generically protected. Nevertheless, we show that it can be restored if the magnetic structure is tuned with externally-applied uniaxial strain. Finally, we present a spin Hamiltonian that identifies the spin interactions needed to account for the complex magnetic order in EuIn$_{2}$As$_{2}$. Our work highlights the importance of the multimodal approach in determining the symmetry of complex order-parameters.

Found 7 papers in prb
Date of feed: Thu, 02 Nov 2023 04:17:02 GMT

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

Depinning free of the elastic approximation
A. B. Kolton, E. E. Ferrero, and A. Rosso
Author(s): A. B. Kolton, E. E. Ferrero, and A. Rosso

We model the isotropic depinning transition of a domain wall using a two-dimensional Ginzburg-Landau scalar field instead of a directed elastic string in a random media. An exact algorithm accurately targets both the critical depinning field and the critical configuration for each sample. For random…

[Phys. Rev. B 108, 174201] Published Wed Nov 01, 2023

Electronic and vibrational excitations on the surface of the three-dimensional topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3−x}{\mathrm{Se}}_{x}$ ($x=0,2,3$)
A. C. Lee, H.-H. Kung, Xueyun Wang, S.-W. Cheong, and G. Blumberg
Author(s): A. C. Lee, H.-H. Kung, Xueyun Wang, S.-W. Cheong, and G. Blumberg

We study surface states in the three-dimensional topological insulators ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3−x}{\mathrm{Se}}_{x}$ ($x=0,2,3$) by polarization resolved resonant Raman spectroscopy. By tracking the spectral intensity of the surface phonon modes with respect to the incident photon energy,…

[Phys. Rev. B 108, 174301] Published Wed Nov 01, 2023

Nonpolar $1T$-to-$1{T}^{′}$ order-disorder transition in a ${\mathrm{MoS}}_{2}$ monolayer
Xue Ma, Ningbo Fan, Jinzhu Zhao, and Bin Xu
Author(s): Xue Ma, Ningbo Fan, Jinzhu Zhao, and Bin Xu

Finding two-dimensional (2D) materials with ferroelectricity is of great interests towards polarization-related applications and nanosized devices. Despite much theoretical efforts that predict the existence of novel 2D ferroelectrics, only a small portion have been realized in experiments. The well…

[Phys. Rev. B 108, 184101] Published Wed Nov 01, 2023

Comparative study of the superconductivity in the Holstein and optical Su-Schrieffer-Heeger models
Andy Tanjaroon Ly, Benjamin Cohen-Stead, Sohan Malkaruge Costa, and Steven Johnston
Author(s): Andy Tanjaroon Ly, Benjamin Cohen-Stead, Sohan Malkaruge Costa, and Steven Johnston

Su-Schrieffer-Heeger (SSH) electron-phonon (eph) interactions have been theorized to play critical roles in several novel states of matter, ranging from nontrivial topological states to high-temperature bipolaronic superconductivity. This work compares the superconducting and competing charge and bond correlations of the two-dimensional Holstein and optical (SSH) models. The authors find that near half-filling, light SSH (bi)polarons support superconductivity to larger values of eph coupling compared to the Holstein polaron. These results are essential for identifying and engineering bipolaronic superconductivity in quantum materials.

[Phys. Rev. B 108, 184501] Published Wed Nov 01, 2023

Quantized thermal Hall conductance and the topological phase diagram of a superconducting bismuth bilayer
Szczepan Głodzik and Nicholas Sedlmayr
Author(s): Szczepan Głodzik and Nicholas Sedlmayr

Two-dimensional topological superconductors with chiral edge modes are predicted to possess a quantized thermal Hall effect proportional to the Chern number, exactly half that for chiral topological insulators. However, not much work has been done in identifying the quantized heat conductance in the…

[Phys. Rev. B 108, 184502] Published Wed Nov 01, 2023

Electrical polarization switching in bulk single-crystal $\mathrm{GaFe}{\mathrm{O}}_{3}$
Maria Biernacka, Paweł Butkiewicz, Konrad J. Kapcia, Wojciech Olszewski, Dariusz Satuła, Marek Szafrański, Marcin Wojtyniak, and Krzysztof R. Szymański
Author(s): Maria Biernacka, Paweł Butkiewicz, Konrad J. Kapcia, Wojciech Olszewski, Dariusz Satuła, Marek Szafrański, Marcin Wojtyniak, and Krzysztof R. Szymański

The electrical polarization switching on a stoichiometric $\mathrm{GaFe}{\mathrm{O}}_{3}$ single crystal was measured, and a model of atomic displacements responsible for the polarization reverse was proposed. The widely adapted mechanism of polarization switching in $\mathrm{GaFe}{\mathrm{O}}_{3}$ …

[Phys. Rev. B 108, 195101] Published Wed Nov 01, 2023

Topological nanophononic interface states using high-order bandgaps in the one-dimensional Su-Schrieffer-Heeger model
A. Rodriguez, K. Papatryfonos, E. R. Cardozo de Oliveira, and N. D. Lanzillotti-Kimura
Author(s): A. Rodriguez, K. Papatryfonos, E. R. Cardozo de Oliveira, and N. D. Lanzillotti-Kimura

Topological interface states in periodic lattices have emerged as valuable assets in the fields of electronics, photonics, and phononics, owing to their inherent robustness against disorder. Unlike electronics and photonics, the linear dispersion relation of hypersound offers an ideal framework for …

[Phys. Rev. B 108, 205301] Published Wed Nov 01, 2023

Found 2 papers in prl
Date of feed: Thu, 02 Nov 2023 04:17:06 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)

Gate-Tunable Berry Curvature Dipole Polarizability in Dirac Semimetal ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$
Tong-Yang Zhao, An-Qi Wang, Xing-Guo Ye, Xing-Yu Liu, Xin Liao, and Zhi-Min Liao
Author(s): Tong-Yang Zhao, An-Qi Wang, Xing-Guo Ye, Xing-Yu Liu, Xin Liao, and Zhi-Min Liao

We reveal the gate-tunable Berry curvature dipole polarizability in Dirac semimetal ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ nanoplates through measurements of the third-order nonlinear Hall effect. Under an applied electric field, the Berry curvature exhibits an asymmetric distribution, forming a field…

[Phys. Rev. Lett. 131, 186302] Published Wed Nov 01, 2023

Optimal Power Extraction from Active Particles with Hidden States
Luca Cocconi, Jacob Knight, and Connor Roberts
Author(s): Luca Cocconi, Jacob Knight, and Connor Roberts

We identify generic protocols achieving optimal power extraction from a single active particle subject to continuous feedback control under the assumption that its spatial trajectory, but not its instantaneous self-propulsion force, is accessible to direct observation. Our Bayesian approach draws on…

[Phys. Rev. Lett. 131, 188301] Published Wed Nov 01, 2023

Found 2 papers in nano-lett
Date of feed: Wed, 01 Nov 2023 13:08:23 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] High-Performance WSe2 Top-Gate Devices with Strong Spacer Doping
Po-Hsun Ho, Yu-Ying Yang, Sui-An Chou, Ren-Hao Cheng, Po-Heng Pao, Chao-Ching Cheng, Iuliana Radu, and Chao-Hsin Chien

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02757

[ASAP] Robustness of Trion State in Gated Monolayer MoSe2 under Pressure
Zeya Li, Feng Qin, Chin Shen Ong, Junwei Huang, Zian Xu, Peng Chen, Caiyu Qiu, Xi Zhang, Caorong Zhang, Xiuxiu Zhang, Olle Eriksson, Angel Rubio, Peizhe Tang, and Hongtao Yuan

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02812

Found 2 papers in science-adv
Date of feed: Wed, 01 Nov 2023 17:58:18 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)

Room temperature field-free switching of perpendicular magnetization through spin-orbit torque originating from low-symmetry type II Weyl semimetal
Yu Zhang, Hongjun Xu, Ke Jia, Guibin Lan, Zhiheng Huang, Bin He, Congli He, Qiming Shao, Yizhan Wang, Mingkun Zhao, Tianyi Ma, Jing Dong, Chenyang Guo, Chen Cheng, Jiafeng Feng, Caihua Wan, Hongxiang Wei, Youguo Shi, Guangyu Zhang, Xiufeng Han, Guoqiang Yu
Science Advances, Volume 9, Issue 44, November 2023.

Valley-conserved topological integrated antenna for 100-Gbps THz 6G wireless
Ridong Jia, Sonu Kumar, Thomas Caiwei Tan, Abhishek Kumar, Yi Ji Tan, Manoj Gupta, Pascal Szriftgiser, Arokiaswami Alphones, Guillaume Ducournau, Ranjan Singh
Science Advances, Volume 9, Issue 44, November 2023.