Found 44 papers in cond-mat

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)

Negative magnetoresistance induced by longitudinal photons in Dirac/Weyl semimetals
J. L. Acosta Avalo, H. P\'erez Rojas
arXiv:2402.16859v1 Announce Type: new Abstract: A low-energy model is built to study systems such as Dirac/Weyl semimetals, according to statistical quantum electrodynamics formalism. We report that the introduction of a pseudoscalar, associated to longitudinal photons propagating along a magnetic field B, could transforms a Dirac semimetal into a Weyl semimetal with a pair of Weyl nodes for each point of Dirac. The nodes are separated by a pseudovector electric field induced dynamically along B associated to a chiral effect on the Fermi surface. A topological quantum transition is produced between a chiral-and non chiral symmetry phase. A general expression to the longitudinal magnetoconductivity is found. It provides the possibility of generalizing the usual expressions of the magnetoconductivity reported in the literature. This has a quadratic dependence on B, which is associated with a positive contribution to the magnetoconductivity. This is a prominent signature of the chiral magnetic effect in Dirac/Weyl systems in parallel electric and magnetic fields. We report a chiral effect induced by longitudinal photons associated to a negative longitudinal magnetoresistance in Dirac systems via an axial anomaly relation. We show some numerical results, and reproduced with a high level of accuracy some of the experimental results, in the low temperature region, obtained to the magnetoresistance of ZrTe5 and Na3Bi. We believe that a wide variety of these semimetals can be studied by using our general expression to the negative longitudinal magnetoresistance.

Exact Calculations of Coherent Information for Toric Codes under Decoherence: Identifying the Fundamental Error Threshold
Jong Yeon Lee
arXiv:2402.16937v1 Announce Type: new Abstract: The toric code is a canonical example of a topological error-correcting code. Two logical qubits stored within the toric code are robust against local decoherence, ensuring that these qubits can be faithfully retrieved as long as the error rate remains below a certain threshold. Recent studies have explored such a threshold behavior as an intrinsic information-theoretic transition, independent of the decoding protocol. These studies have shown that information-theoretic metrics, calculated using the Renyi (replica) approximation, demonstrate sharp transitions at a specific error rate. However, an exact analytic expression that avoids using the replica trick has not been shown, and the connection between the transition in information-theoretic capacity and the random bond Ising model (RBIM) has only been indirectly established. In this work, we present the first analytic expression for the coherent information of a decohered toric code, thereby establishing a rigorous connection between the fundamental error threshold and the criticality of the RBIM.

Orbital selective order and $\mathbb{Z}_3$ Potts nematicity from a non-Fermi liquid
YuZheng Xie, Andrew Hardy, Arun Paramekanti
arXiv:2402.16952v1 Announce Type: new Abstract: Motivated by systems where a high temperature non-Fermi liquid gives way to low temperature $\mathbb{Z}_3$ Potts nematic order, we studied a three-orbital Sachdev-Ye-Kitaev (SYK) model in the large-$N$ limit. In the single-site limit, this model exhibits a spontaneous orbital-selective transition which preserves average particle-hole symmetry, with two orbitals becoming insulators while the third orbital remains a non-Fermi liquid down to zero temperature. We extend this study to lattice models of three-orbital SYK dots, exploring uniform symmetry broken states on the triangular and cubic lattices. At high temperature, these lattice models exhibit an isotropic non-Fermi liquid metal phase. On the three-dimensional (3D) cubic lattice, the low temperature uniform $\mathbb{Z}_3$ nematic state corresponds to an orbital selective layered state which preserves particle-hole symmetry at small hopping and spontaneously breaks the particle-hole symmetry at large hopping. Over a wide range of temperature, the transport in this layered state shows metallic in-plane resistivity but insulating out-of-plane resistivity. On the 2D triangular lattice, the low temperature state with uniform orbital order is also a correlated $\mathbb{Z}_3$ nematic with orbital-selective transport but it remains metallic in both principal directions. We discuss a Landau theory with $\mathbb{Z}_3$ clock terms which captures salient features of the phase diagram and nematic order in all these models. We also present results on the approximate wavevector dependent orbital susceptibility of the isotropic non-Fermi liquid states.

Giant quantum oscillations in thermal transport in low-density metals via electron absorption of phonons
B. Bermond, R. Wawrzynczak, S. Zherlitsyn, T. Kotte, T. Helm, D. Gorbunov, G. D. Gu, Q. Li, F. Janasz, T. Meng, F. Menges, C. Felser, J. Wosnitza, Adolfo G. Grushin, David Carpentier, J. Gooth, S. Galeski
arXiv:2402.17022v1 Announce Type: new Abstract: Oscillations of conductance observed in strong magnetic fields are a striking manifestation of the quantum dynamics of charge carriers in solids. The large charge carrier density in typical metals sets the scale of oscillations in both electrical and thermal conductivity, which characterize the Fermi surface. In semimetals, thermal transport at low-charge carrier density is expected to be phonon dominated, yet several experiments observe giant quantum oscillations in thermal transport. This raises the question of whether there is an overarching mechanism leading to sizable oscillations that survives in phonon-dominated semimetals. In this work, we show that such a mechanism exists. It relies on the peculiar phase-space allowed for phonon scattering by electrons when only a few Landau levels are filled. Our measurements on the Dirac semimetal ZrTe5 support this counter-intuitive mechanism through observation of pronounced thermal quantum oscillations, since they occur in similar magnitude and phase in directions parallel and transverse to the magnetic field. Our phase-space argument applies to all low-density semimetals, topological or not, including graphene and bismuth. Our work illustrates that phonon absorption can be leveraged to reveal degrees of freedom through their imprint on longitudinal thermal transport.

Feasibility analysis of a proposed test of quantum gravity via novel optical magnetometry in xenon
James Maldaner, Mitja Fridman, Saurya Das, Gil Porat
arXiv:2402.17057v1 Announce Type: new Abstract: We present an analysis of the sensitivity limits of a proposed experimental search for quantum gravity, using a novel approach based on optical magnetometry in the noble gas isotope $^{129}$Xe. The analysis relies on a general uncertainty principle model that is consistent with most formulations of quantum gravity theory, where the canonical uncertainty relations are modified by a leading-order correction term that is linear in momentum. In turn, this correction modifies the magnetic moment of the spin-polarized $^{129}$Xe atoms that are immersed in a magnetic field in the proposed experiment, which results in a velocity-dependent variation of their Larmour frequency, that is detected via two-photon laser spectroscopy. The thermal distribution of atomic velocities, in conjunction with the Doppler effect, is used to scan the interrogating laser over different atomic velocities, and search for a corresponding variation in their Larmor frequencies. We show that the existing bounds on the leading-order quantum gravity correction can be improved by $10^{7}$ with existing technology, where another factor of $10^{2}$ is possible with near-future technical capabilities.

Design principles of nonlinear optical materials for Terahertz lasers
Juan Han, Yiwei Sun, Xiamin Huang, Wenjun Shuai, Guangyou Fang, Zhou Li
arXiv:2402.17126v1 Announce Type: new Abstract: We have investigated both inter-band and intra-band second order nonlinear optical conductivity based on the velocity correlation formalism and the spectral expansion technique. We propose a scenario in which the second order intra-band process is nonzero while the inter-band process is zero. This occurs for a band structure with momentum asymmetry in the Brillouin zone. Very low-energy photons are blocked by the Pauli exclusion principle from participating in the inter-band process; however, they are permitted to participate in the intra-band process, with the band smeared by some impurity scattering. We establish a connection between the inter-band nonlinear optical conductivity in the velocity gauge and the shift vector in the length gauge for a two-band model. Using a quasiclassical kinetic approach, we demonstrate the importance of intra-band transitions in high harmonic generations for the single tilted Dirac cone model and hexagonal warping model. We confirm that the Kramers-Kronig relations break down for the limit case of ($\omega$, $-\omega$) in the nonlinear optical conductivity. Finally, we calculate the superconducting transition temperature of NbN and the dielectric function of AlN, and the resistance of the NbN/AlN junction. The natural non-linearity of the Josephson junction brings a Josephson plasma with frequency in the Terahertz region.

Layer Coherence Origin of Intrinsic Planar Hall Effect in 2D Limit
Huiyuan Zheng, Dawei Zhai, Cong Xiao, Wang Yao
arXiv:2402.17166v1 Announce Type: new Abstract: The intrinsic planar Hall effect has attracted intensive interest inspired by recent experiments. Existing theories of this effect require three dimensional orbital motion, or strong spin-orbit coupling of certain forms, which do not exist in van der Waals thin films. Here, we uncover a new origin of the planar Hall effect - as an intrinsic property of layer coherent electrons - that allows its presence even in bilayer and trilayer atomically thin limit. As examples, we show that the effect can be triggered by strain and interlayer sliding respectively in twisted bilayer graphene and trilayer transition metal dichalcogenides, where the effect features rich tunability and even stronger magnitude than those induced by topological nodal structures in bulk materials. The layer mechanism also provides a new route towards quantized Hall response upon a topological phase transition induced by in-plane magnetic field. These results unveil the unexplored potential of quantum layertronics and moir\'e flat band for planar Hall transport.

Design Rules for Interconnects Based on Graphene Nanoribbon Junctions
Kristi\=ans \v{C}er\c{n}evi\v{c}s, Oleg V. Yazyev
arXiv:2402.17186v1 Announce Type: new Abstract: Graphene nanoribbons (GNRs) produced by means of bottom-up chemical self-assembly are considered promising candidates for the next-generation nanoelectronic devices. We address the electronic transport properties of angled two-terminal GNR junctions, which are inevitable in the interconnects in graphene-based integrated circuits. We construct a library of over 400000 distinct configurations of 60$^\circ$ and 120$^\circ$ junctions connecting armchair GNRs of different widths. Numerical calculations combining the tight-binding approximation and the Green's function formalism allow identifying numerous junctions with conductance close to the limit defined by the GNR leads. Further analysis reveals underlying structure-property relationships with crucial roles played by the bipartite symmetry of graphene lattice and the presence of resonant states localized at the junction. In particular, we discover and explain the phenomenon of binary conductance in 120$^\circ$ junctions connecting metallic GNR leads that guarantees maximum possible conductance. Overall, our study defines the guidelines for engineering GNR junctions with desired electrical properties.

A computational method for angle-resolved photoemission spectra from repeated-slab band structure calculations
Misa Nozaki, Peter Kr\"uger
arXiv:2402.17199v1 Announce Type: new Abstract: A versatile method for angle-resolved photoemission spectra (ARPES) calculations is reported within the one-step model of photoemission. The initial states are obtained from a repeated-slab calculation using the projector-augmented wave (PAW) method. ARPES final states are constructed by matching the repeated-slab eigenstates of positive energy with free electron states that satisfy the time-reversed low-energy electron diffraction boundary conditions. Nonphysical solutions of the matching equations, which do not respect the flux conservation, are discarded. The method is applied to surface-normal photoemission from graphene as a function of photon energy from threshold up to 100 eV. The results are compared with independently performed multiple scattering calculations and very good agreement is obtained, provided that the photoemission matrix elements are computed with all-electron waves reconstructed from the PAW pseudo-waves. However, if the pseudo-waves are used directly, the relative intensity between $\sigma$- and $\pi$-band emission is wrong by an order of magnitude. The graphene ARPES intensity has a strong photon energy dependence including resonances. The normal emission spectrum from the $\pi$-band shows a hitherto unreported, sharp resonance at a photon energy of 31 eV. The resonance is due to a 2$D$ interband transitions and highlights the importance of matrix element effects beyond the final state plane-wave approximation.

Oxygen Reduction Reaction on Single-Atom Catalysts From Density Functional Theory Calculations Combined with an Implicit Solvation Model
Azim Fitri Zainul Abidin, Ikutaro Hamada
arXiv:2402.17261v1 Announce Type: new Abstract: We present a density functional theory study of the oxygen reduction reaction (ORR) on a single atom catalyst embedded in graphene, namely, TM-N$_{4}$-C (TM = Fe and Co), using the effective screening medium method combined with the reference interaction site model (ESM-RISM). It was found that Fe-N$_{4}$-C and Co-N$_{4}$-C show comparable ORR activities from the constant electrode potential simulations, in contrast to the results obtained using the constant (neutral) charge simulation, in which the superior performance of Co-N$_{4}$-C has been predicted. The constant potential method allows the variable charge and thus results in a potential dependence of the reaction-free energies different from that with the constant charge method in which the potential dependence is included as an ad hoc manner. We suggest the importance of the variable charge in the simulation of the electrochemical reaction, which is enabled by ESM-RISM.

Eigenstate switching of topologically ordered states using non-Hermitian perturbations
Cheol Hun Yeom, Beom Hyun Kim, Moon Jip Park
arXiv:2402.17280v1 Announce Type: new Abstract: Topologically ordered phases have robust degenerate ground states against the local perturbations, providing a promising platform for fault-tolerant quantum computation. Despite of the non-local feature of the topological order, we find that local non-Hermitian perturbations can induce the transition between the topologically ordered ground states. In this work, we study the toric code in the presence of non-Hermitian perturbations. By controlling the non-Hermiticity, we show that non-orthogonal ground states can exhibit an eigenstate coalescence and have the spectral singularity, known as an exceptional point (EP). We explore the potential of the EPs in the control of topological order. Adiabatic encircling EPs allows for the controlled switching of eigenstates, enabling dynamic manipulation between the ground state degeneracy. Interestingly, we show a property of our scheme that arbitrary strengths of local perturbations can induce the EP and eigenstate switching. Finally, we also show the orientation-dependent behavior of non-adiabatic transitions (NAT) during the dynamic encirclement around an EP. Our work shows that control of the non-Hermiticity can serve as a promising strategy for fault-tolerant quantum information processing.

Percolating Superconductivity in Air-Stable Organic-Ion Intercalated MoS2
Jose M. Pereira, Daniel Tezze, Iris Niehues, Yaiza Asensio, Haozhe Yang, Lars Mester, Shu Chen, Felix Casanova, Alexander M. Bittner, Maider Ormaza, Frederik Schiller, Beatriz Martin-Garcia, Rainer Hillenbrand, Luis E. Hueso, Marco Gobbi
arXiv:2402.17328v1 Announce Type: new Abstract: When doped into a certain range of charge carrier concentrations, MoS2 departs from its pristine semiconducting character to become a strongly correlated material characterized by exotic phenomena such as charge density waves or superconductivity. However, the required doping levels are typically achieved using ionic-liquid gating or air-sensitive alkali-ion intercalation, which are not compatible with standard device fabrication processes. Here, we report on the emergence of superconductivity and a charge density wave phase in air-stable organic cation intercalated MoS2 crystals. By selecting two different molecular guests, we show that these correlated electronic phases depend dramatically on the intercalated cation, demonstrating the potential of organic ion intercalation to finely tune the properties of 2D materials. Moreover, we find that a fully developed zero-resistance state is not reached in few-nm-thick flakes, indicating the presence of three-dimensional superconductive paths which are severed by the mechanical exfoliation. We ascribe this behavior to an inhomogeneous charge carrier distribution, which we probe at the nanoscale using scanning near-field optical microscopy. Our results establish organic-ion intercalated MoS2 as a platform to study the emergence and modulation of correlated electronic phases.

Modulation of chiral anomaly and bilinear magnetoconductivity in Weyl semimetals by impurity-resonance states
Mei-Wei Hu, Zhuo-Yan Fang, Hou-Jian Duan, Mou Yang, Ming-Xun Deng, Rui-Qiang Wang
arXiv:2402.17356v1 Announce Type: new Abstract: The phenomenon of nonlinear transport has attracted tremendous interest within the condensed matter community. We present a theoretical framework for nonlinear transport based on the nonequilibrium retarded Green's function, and examine the impact of disorder on nonlinear magnetotransport in Weyl semimetals (WSMs). It is demonstrated that bilinear magnetoconductivity can be induced in disordered WSMs by several mechanisms, including impurity-induced tilting of the Weyl cones, Lorentz-force-induced normal orbital magnetic moment, and chiral anomaly arising from the Berry-curvature-induced anomalous orbital magnetic moment. Additionally, we observe that the localization of Weyl fermions by impurity scattering will lead to resonant dips in both the chiral chemical potential and magnetoconductivity when the Fermi energy approaches the impurity resonance states. Our findings offer a theoretical proposition for modulating nonreciprocal transport in topological semimetals.

Quantum scaling of the spin lattice relaxation rate in the checkerboard $J$-$Q$ model
Chengchen Li, Huihang Lin, Rong Yu
arXiv:2402.17418v1 Announce Type: new Abstract: Motivated by recent progress on the experimental realization of proximate deconfined quantum critical point in a frustrated quantum magnet, we study the low-energy spin dynamics of a related checkerboard $J$-$Q$ model by using quantum Monte Carlo simulations. The ground state of this model undergoes a weakly first-order quantum phase transition with an emergent $O(4)$ symmetry between an antiferromagnetic state and a plaquette valence bond solid. The calculated spin lattice relaxation rate of nuclear magnetic resonance, $1/T_1$, exhibits distinct low-temperature behaviors depending on the ground states. With decreasing the temperature, $1/T_1$ rises up on the antiferromagnetic side, characterizing a crossover to the renormalized classical regime, whereas $1/T_1$ drops exponentially on the side of valence bond solid, reflecting the gap opening in the plaquette ordered phase. The extracted spin gap scales with the distance to the transition point as a power-law with an exponent $\phi\approx0.3$, consistent with the scaling ansatz $\phi=\nu z$ with $\nu\approx0.3$ and $z=1$. Near the quantum phase transition, the temperature dependent $1/T_1$ shows a broad crossover regime where a universal scaling $1/T_1\sim T^{\eta}$ with $\eta\approx0.6$ is found. Our results suggest a quantum scaling regime associated with the emergent enhanced symmetry near this first-order quantum phase transition.

Nuclear spin relaxation mediated by donor-bound and free electrons in wide CdTe quantum wells
Boris F. Gribakin, Valentina M. Litvyak, Mladen Kotur, Regis Andr\'e, Maria Vladimirova, Dmitri R. Yakovlev, Kirill V. Kavokin
arXiv:2402.17435v1 Announce Type: new Abstract: The nuclear spin systems in CdTe/(Cd,Zn)Te and CdTe/(Cd,Mg)Te quantum wells (QW) are studied using a multistage technique combining optical pumping and Hanle effect-based detection. The samples demonstrate drastically different nuclear spin dynamics in zero and weak magnetic fields. In CdTe/(Cd,Zn)Te, the nuclear spin relaxation time is found to strongly increase with the magnetic field, growing from 3 s in zero field to tens of seconds in a field of 25 G. In CdTe/(Cd,Mg)Te the relaxation is an order of magnitude slower, and it is field-independent up to at least 70 G. The differences are attributed to the nuclear spin relaxation being mediated by different kinds of resident electrons in these QWs. In CdTe/(Cd,Mg)Te, a residual electron gas trapped in the QW largely determines the relaxation dynamics. In CdTe/(Cd,Zn)Te, the fast relaxation in zero field is due to interaction with localized donor-bound electrons. Nuclear spin diffusion barriers form around neutral donors when the external magnetic field exceeds the local nuclear field, which is about $B_L\approx $0.4 G in CdTe. This inhibits nuclear spin diffusion towards the donors, slowing down relaxation. These findings are supported by theoretical modeling. In particular, we show that the formation of the diffusion barrier is made possible by several features specific to CdTe: (i) the large donor binding energy (about 10 meV), (ii) the low abundance of magnetic isotopes (only $\approx$30% of nuclei have nonzero spin), and (iii) the absence of nuclear quadrupole interactions between nuclei. The two latter properties are also favorable to nuclear spin cooling via optical pumping followed by adiabatic demagnetization. Under non-optimized conditions we have reached sub-microkelvin nuclear spin temperatures in both samples, lower than all previous results obtained in GaAs.

Room Temperature Spin Filtering and Quantum Transport with Transition Metal-Doped Silicon Quantum Dot
Hemant Arora, Arup Samanta
arXiv:2402.17461v1 Announce Type: new Abstract: Spin filtering is a fundamental operation in spintronics, enabling the generation and detection of spin-polarized carriers. Here, we proposed and theoretically demonstrated that a 3d transition metal (TM) doped silicon quantum dot (SiQD) is a suitable candidate for spin filter device at room temperature. Using density functional theory (DFT), we investigate the structure, electronic properties, and magnetic behavior of TM-SiQD. Our calculations demonstrate that Mn-doped SiQD exhibits the highest stability. The designed spin-filter device using Mn-doped SiQD shows a spin-filtering efficiency of 99.9% at 300K electrode temperature along with very high conductance. This remarkable efficiency positions it as a promising candidate for room-temperature spintronic devices.

Few-body bound topological and flat-band states in a Creutz Ladder
Gerard Pelegr\'i, Stuart Flannigan, Andrew J. Daley
arXiv:2402.17494v1 Announce Type: new Abstract: We investigate the properties of few interacting bosons in a Creutz ladder, which has become a standard model for topological systems, and which can be realised in experiments with cold atoms in optical lattices. At the single-particle level, this system may exhibit a completely flat energy landscape with non-trivial topological properties. In this scenario, we identify topological two-body edge states resulting from the bonding of single-particle edge and flat-band states. We also explore the formation of two- and three-body bound states in the strongly-interacting limit, and we show how these quasi-particles can be engineered to replicate the flat-band and topological features of the original single-particle model. Furthermore, we show that in this geometry perfect Aharonov-Bohm caging of two-body bound states may occur for arbitrary interaction strengths, and we provide numerical evidence that the main features of this effect are preserved in an interacting many-body scenario resulting in many-body Aharonov-Bohm caging.

Electrically driven cascaded photon-emission in a single molecule
Katharina Kaiser, Anna Ros{\l}awska, Michelangelo Romeo, Fabrice Scheurer, Tom\'a\v{s} Neuman, Guillaume Schull
arXiv:2402.17536v1 Announce Type: new Abstract: Controlling electrically-stimulated quantum light sources (QLS) is key for developing integrated and low-scale quantum devices. The mechanisms leading to quantum emission are complex, as a large number of electronic states of the system impacts the emission dynamics. Here, we use a scanning tunneling microscope (STM) to excite a model QLS, namely a single molecule. The luminescence spectra reveal two lines, associated to the emission of the neutral and positively charged molecule, both exhibiting single-photon source behavior. In addition, we find a correlation between the charged and neutral molecule's emission, the signature of a photon cascade. By adjusting the charging/discharging rate, we can control these emission statistics. This generic strategy is further established by a rate equation model revealing the complex internal dynamics of the molecular junction.

Forming 1D Periodic J-aggregates by Mechanical Bending of BNNTs: Evidence of Activated Molecular Diffusion
J. -B. Marceau, D. -M Ta, A. Aguilar, A. Loiseau, R. Martel, P. Bon, R. Voituriez, G. Recher, E. Gaufr\`es
arXiv:2402.17537v1 Announce Type: new Abstract: Driving molecular assembly into micrometer-scale patterns is key for defining advanced materials of interest in various fields, including life sciences, photovoltaics, and quantum photonics. However, the driving process competes with other forces, such as Brownian motion, ripening phenomena, capillary forces, and non-specific adsorption. Here we report on a guided diffusion mechanism of luminescent dye molecules encapsulated inside boron nitride nanotubes (BNNTs). Correlative measurements between BNNT bending and molecular position along the BNNT axis reveal an efficient and long-range migration of dyes from curved to straight regions of the nanotube. This curvature activated diffusion forms clusters of bright J-aggregates in periodic patterns of well-defined spacing and length. A phenomenological model of guided molecular transport in bended BNNTs is used to describe this directed 1D diffusion inside BNNT. It is shown to accurately predict the position and morphologies of a J-aggregate as a function of nanotube length. Coupling topological stimuli to 1D molecular diffusion at the nanoscale is here presented as an interesting tool capable of reconfiguring various emissive patterns of functional molecules at the mesoscopic scale.

Circular THz ratchets in a 2D-modulated Dirac system
M. Hild, I. Yahniuk, L. E. Golub, J. Amann, J. Eroms, D. Weiss, K. Watanabe, T. Taniguchi, S. D. Ganichev
arXiv:2402.17540v1 Announce Type: new Abstract: We report on the observation of the circular ratchet effect excited by terahertz laser radiation in a specially designed two-dimensional metamaterial consisting of a graphene monolayer deposited on a graphite gate patterned with an array of triangular antidots. We show that a periodically driven Dirac fermion system with spatial asymmetry converts the a.c. power into a d.c. current, whose direction reverses when the radiation helicity is switched. The circular ratchet effect is demonstrated for room temperature and a radiation frequency of 2.54 THz. It is shown that the ratchet current magnitude can be controllably tuned by the patterned and uniform back gate voltages. The results are analyzed in the light of the developed microscopic theory considering electronic and plasmonic mechanisms of the ratchet current formation.

Fast Lithium Ion Diffusion in Brownmillerite $\mathrm{Li}_{x}\mathrm{{Sr}_{2}{Co}_{2}{O}_{5}}$
Xin Chen, Xixiang Zhang, Jie-Xiang Yu, Jiadong Zang
arXiv:2402.17557v1 Announce Type: new Abstract: Ionic conductors have great potential for interesting tunable physical properties via ionic liquid gating and novel energy storage applications such as all-solid-state lithium batteries. In particular, low migration barriers and high hopping attempt frequency are the keys to achieve fast ion diffusion in solids. Taking advantage of the oxygen-vacancy channel in $\mathrm{Li}_{x}\mathrm{{Sr}_{2}{Co}_{2}{O}_{5}}$, we show that migration barriers of lithium ion are as small as 0.28~0.17eV depending on the lithium concentration rates. Our first-principles calculation also investigated hopping attempt frequency and concluded the room temperature ionic diffusivity and ion conductivity is high as ${10}^{-7}\sim{10}^{-6}~\mathrm{{cm}^{2}~s^{-1}}$ and ${10}^{-3}\sim{10}^{-2}~\mathrm{S\cdot{cm}^{-1}}$ respectively, which outperform most of perovskite-type, garnet-type and sulfide Li-ion solid-state electrolytes. This work proves $\mathrm{Li}_{x}\mathrm{{Sr}_{2}{Co}_{2}{O}_{5}}$ as a promising solid-state electrolyte.

Local heat current flow in the ballistic phonon transport of graphene nanoribbons
Yin-jie Chen, Jing-tao L\"u
arXiv:2402.17639v1 Announce Type: new Abstract: Utilizing nonequilibrium Green's function method, we study the phonon local heat current flow in nanoscale graphene nanoribbons. Ballistic transport and boundary scattering lead to formation of atomic scale current vortices. Using the B\"uttiker probe approach, we further map out the temperature distribution in the junction. From the heat current and temperature distribution, we observe negative local resistance of the junctions, where heat current direction goes from colder to hotter regime. Moreover, we show that atomic scale defect can generate heat vortex at certain frequency, but it is averaged out when including contributions from all the phonon modes. These results extend the study of local heat vortex and negative temperature response in bulk hydrodynamic regime to atomic-scale ballistic regime, further confirming boundary scattering is crucial to generate backflow of heat current.

Classification of electronic nematicity in three-dimensional crystals and quasicrystals
Matthias Hecker, Anant Rastogi, Daniel F. Agterberg, Rafael M. Fernandes
arXiv:2402.17657v1 Announce Type: new Abstract: Electronic nematic order has been reported in a rich landscape of materials, encompassing not only a range of intertwined correlated and topological phenomena, but also different underlying lattice symmetries. Motivated by these findings, we investigate the behavior of electronic nematicity as the spherical symmetry of three-dimensional (3D) space is systematically lowered by the lattice environment. We consider all 32 crystallographic point groups as well as 4 major classes of quasicrystalline point groups, given the recent observations of electronic phases of interest in quasicrystalline materials and artificial twisted quasicrystals. Valuable insights are gained by establishing a mapping between the five-component charge-quadrupolar nematic order parameter of the electronic fluid and the 3D tensorial order parameter of nematic liquid crystals. We find that a uniaxial nematic state is only generically realized in polyhedral point groups (icosahedral and cubic), with the nematic director pointing along different sets of rotational symmetry axes. Interestingly, icosahedral point groups are the only ones in which the five nematic order parameter components transform as the same irreducible representation, making them the closest analog of 3D isotropic nematics. In axial point groups, one of the nematic components is always condensed, whereas the other four components decompose into an in-plane and an out-of-plane nematic doublet, resulting in biaxial nematic ground states. Because these two nematic doublets behave as $Z_q$-clock order parameters, this allows us to identify the types of crystals and quasicrystals that can host interesting electronic nematic phenomena enabled by the critical properties of the $q\geq 4$ clock model, such as emergent continuous nematic fluctuations in 3D, critical phases with quasi-long-range nematic order in 2D, and Ashkin-Teller nematicity in 2D.

Zig-zag dynamics in a Stern-Gerlach spin measurement
Simon Krekels, Christian Maes, Kasper Meerts, Ward Struyve
arXiv:2311.13406v2 Announce Type: cross Abstract: The one-century-old Stern-Gerlach setup is paradigmatic for a quantum measurement. We visualize the electron trajectories following the Bohmian zig-zag dynamics. This dynamics was developed in order to deal with the fundamentally massless nature of particles (with mass emerging from the Brout-Englert-Higgs mechanism). The corresponding trajectories exhibit a stochastic zig-zagging, as the result of the coupling between left- and right-handed chiral Weyl states. This zig-zagging persists in the nonrelativistic limit, which will be considered here, and which is described by the Pauli equation for a nonuniform external magnetic field. Our results clarify the different meanings of ``spin'' as a property of the wave function and as a random variable in the Stern-Gerlach setup, and they illustrate the notion of effective collapse. We also examine the case of an EPR-pair. By letting one of the entangled particles pass through a Stern-Gerlach device, the nonlocal influence (action-at-a-distance) on the other particle is manifest in its trajectory, e.g. by initiating its zig-zagging.

Standing spin waves in Permalloy-NiO bilayers as a probe of the interfacial exchange coupling
Diego Caso, Ana Garc\'ia-Prieto, Eugenia Sebastiani-Tofano, Akashdeep Kamra, Cayetano Hern\'andez, Pilar Prieto, Farkhad G. Aliev
arXiv:2402.10292v1 Announce Type: cross Abstract: Ferromagnetic/Antiferromagnetic (FM/AFM) bilayers dynamics have been a recent topic of interest due to the interaction occurring at the interface, where the magnetic moments of the AFM can be imprinted into the FM, and the exchange bias field can affect these dynamics. Here, we investigate Permalloy (Py) and NiO (Py/NiO) hybrids and for comparison single Py films in the broad Py thickness range varied from few nm to 200 nm by using static (Kerr effect) and dynamic (spin waves) measurements along with micromagnetic simulations. We observe hybrid modes between uniform (ferromagnetic resonance FMR, n=0) and perpendicular standing spin waves (PSSWs, n=1, 2) and a clear enhancement of the PSSWs modes frequencies upon interfacing Py with NiO both from experiments and simulations. This enhancement becomes less pronounced as the thickness of the film increases, demonstrating its interfacial origin rooted in the exchange coupling between the FM and AFM layers. Besides, through micromagnetic simulations, we investigate and correlate changes in spatial profiles of the PSSWs with the interfacial exchange coupling. As the thickness is increased, we see that the n=1 and n=2 modes begin to couple with the fundamental FMR mode, resulting in asymmetric (with respect the Py layer center) modes. Our results suggest that PSSWs detection in a ferromagnet offers a means of probing the interfacial exchange coupling with the adjacent AFM layer. Furthermore, the controlled spatial symmetry breaking by the AFM layer enables engineering of PSSWs with different spatial profiles in the FM.

Projected state ensemble of a generic model of many-body quantum chaos
Amos Chan, Andrea De Luca
arXiv:2402.16939v1 Announce Type: cross Abstract: The projected ensemble is based on the study of the quantum state of a subsystem $A$ conditioned on projective measurements in its complement. Recent studies have observed that a more refined measure of the thermalization of a chaotic quantum system can be defined on the basis of convergence of the projected ensemble to a quantum state design, i.e. a system thermalizes when it becomes indistinguishable, up to the $k$-th moment, from a Haar ensemble of uniformly distributed pure states. Here we consider a random unitary circuit with the brick-wall geometry and analyze its convergence to the Haar ensemble through the frame potential and its mapping to a statistical mechanical problem. This approach allows us to highlight a geometric interpretation of the frame potential based on the existence of a fluctuating membrane, similar to those appearing in the study of entanglement entropies. At large local Hilbert space dimension $q$, we find that all moments converge simultaneously with a time scaling linearly in the size of region $A$, a feature previously observed in dual unitary models. However, based on the geometric interpretation, we argue that the scaling at finite $q$ on the basis of rare membrane fluctuations, finding the logarithmic scaling of design times $t_k = O(\log k)$. Our results are supported with numerical simulations performed at $q=2$.

Dielectric Loss due to Charged-Defect Acoustic Phonon Emission
Mark E. Turiansky, Chris G. Van de Walle
arXiv:2402.17291v1 Announce Type: cross Abstract: The coherence times of state-of-the-art superconducting qubits are limited by bulk dielectric loss, yet the microscopic mechanism leading to this loss is unclear. Here we propose that the experimentally observed loss can be attributed to the presence of charged defects that enable the absorption of electromagnetic radiation by the emission of acoustic phonons. Our explicit derivation of the absorption coefficient for this mechanism allows us to derive a loss tangent of $7.2 \times 10^{-9}$ for Al$_2$O$_3$, in good agreement with recent high-precision measurements [A. P. Read et al., Phys. Rev. Appl. 19, 034064 (2023)]. We also find that for temperatures well below ~0.2 K, the loss should be independent of temperature, also in agreement with observations. Our investigations show that the loss per defect depends mainly on properties of the host material, and a high-throughput search suggests that diamond, cubic BN, AlN, and SiC are optimal in this respect.

Comparative study of photo-induced electronic transport along ferroelectric domain walls in lithium niobate single crystals
Lili Ding, Elke Beyreuther, Boris Koppitz, Konrad Kempf, Jianhua Ren, Weijin Chen, Michael R\"using, Yue Zheng, Lukas M. Eng
arXiv:2402.17508v1 Announce Type: cross Abstract: Ferroelectric domain wall conductivity (DWC) is an intriguing functional property, that can be controlled through external stimuli such as electric and mechanical fields. Optical-field control, as a non-invasive flexible handle, has rarely been applied so far, but significantly expands the possibility for both tuning and probing DWC. On the one hand, as known from Second-Harmonic, Raman, and CARS micro-spectroscopy, the optical in-and-out approach delivers parameters on the DW distribution, the DW inclination, and probes the DW vibrational modes; on the other hand, photons might be applied also to directly generate charge carriers within the DW, hence acting as a functional and spectrally tunable probe to deduce the integral or local absorption properties and bandgaps of conductive DWs. Here, we report on such an optoelectronic approach by investigating the photo-induced DWC (PI-DWC) in DWs of the model system lithium niobate, a material that is well known for hosting conductive DWs. We compare three different crystals containing different numbers of domain walls: (A) none, (B) one, and (C) many conductive DWs. All samples are inspected for their current-voltage (I-V) behavior (i) in darkness, and (ii) for different illumination wavelengths swept from 500 nm down to 310 nm. All samples show their maximum PI-DWC at 310 nm, i.e., at the optical bandgap of lithium niobate; moreover, sample (C) reaches PI-DWCs of several $\mu$A. Interestingly, a noticeable PI-DWC is also observed for sub-bandgap illumination, i.e., wavelengths as high as 500 nm, hinting towards the existence and decisive role of electronic in-gap states that contribute to the electronic transport along DWs. Finally, conductive atomic force microscopy (c-AFM) investigations under illumination proved that the PI-DWC is confined to the DW area, and does not originate from photo-induced bulk conductivity.

Sustained Robust Exciton Emission in Suspended Monolayer WSe_2 within the Low Carrier Density Regime for Quantum Emitter Applications
Zheng-Zhe Chen, Chiao-Yun Chang, Ya-Ting Tsai, Po-Cheng Tsai, Shih-Yen Lin, Min-Hsiung Shih
arXiv:2402.17600v1 Announce Type: cross Abstract: The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density region, where the Shockley-Read-Hall recombination may dominant and seriously reduce the emission efficiency. In order to diminish the affection of carrier trapping and sustain a strong photoluminescence emission under low power pumping condition, we investigated on the influence of Suspending to monolayered tungsten diselenide, novel two-dimensional quantum material. Not only the PL intensity, but also the fundamental photoluminescence quantum yield has exhibited a huge, order-scale enhancement through suspending, even surprisingly, we found the PLQY improvement revealed far significantly under small pumping power and came out an exponential increase tendency toward even lower carrier density region. With its strong excitonic effect, suspended WSe_2 offers a solution to reduce carrier trapping and participate in non-radiative processes. Moreover, in the low-power range where SRH recombination dominates, suspended WSe_2 exhibited remarkably higher percentage of excitonic radiation compared to contacted WSe_2. Herein, we quantitatively demonstrate the significance of suspended WSe_2 monolayer at low carrier density region, highlighting its potential for developing compact, low-power quantum emitters in the future.

Dual chiral density wave induced oscillating Casimir effect
Daisuke Fujii, Katsumasa Nakayama, Kei Suzuki
arXiv:2402.17638v1 Announce Type: cross Abstract: The Casimir effect is known to be induced from photon fields confined by a small volume, and also its fermionic counterpart has been predicted in a wide range of quantum systems. Here, we investigate what types of Casimir effects can occur from quark fields in dense and thin quark matter. In particular, in the dual chiral density wave, which is a possible ground state of dense quark matter, we find that the Casimir energy oscillates as a function of the thickness of matter. This oscillating Casimir effect is regarded as an analog of that in Weyl semimetals and is attributed to the Weyl points in the momentum space of quark fields. In addition, we show that an oscillation is also induced from the quark Fermi sea, and the total Casimir energy is composed of multiple oscillations.

Evidence of $\phi$0-Josephson junction from skewed diffraction patterns in Sn-InSb nanowires
B. Zhang, Z. Li, V. Aguilar, P. Zhang, M. Pendharkar, C. Dempsey, J. S. Lee, S. D. Harrington, S. Tan, J. S. Meyer, M. Houzet, C. J. Palmstrom, S. M. Frolov
arXiv:2212.00199v3 Announce Type: replace Abstract: We study Josephson junctions based on InSb nanowires with Sn shells. We observe skewed critical current diffraction patterns: the maxima in forward and reverse current bias are at different magnetic flux, with a displacement of 20-40 mT. The skew is greatest when the external field is nearly perpendicular to the nanowire, in the substrate plane. This orientation suggests that spin-orbit interaction plays a role. We develop a phenomenological model and perform tight-binding calculations, both methods reproducing the essential features of the experiment. The effect modeled is the $\phi$0-Josephson junction with higher-order Josephson harmonics. The system is of interest for Majorana studies: the effects are either precursor to or concomitant with topological superconductivity. Current-phase relations that lack inversion symmetry can also be used to design quantum circuits with engineered nonlinearity.

Anyon condensation and confinement transition in a Kitaev spin liquid bilayer
Kyusung Hwang
arXiv:2301.05721v3 Announce Type: replace Abstract: Transitions between quantum spin liquids (QSLs) are fundamental problems lying beyond the Landau paradigm and requiring a deep understanding of the entanglement structures of QSLs called topological orders. The novel concept of anyon condensation has been proposed as a theoretical mechanism, predicting various possible transitions between topological orders, but it has long been elusive to confirm the mechanism in quantum spin systems. Here, we introduce a concrete spin model that incarnates the mechanism of anyon condensation transition. Our model harbors two topological QSLs in different parameter regions, a non-abelian Kitaev spin liquid (KSL) bilayer state and a resonating valence bond (RVB) state. The bilayer-KSL-to-RVB transition indeed occurs by the mechanism of anyon condensation, which we identify by using parton theories and exact diagonalization studies. Moreover, we observe "anyon confinement" phenomena in our numerical results, akin to the quark confinement in high energy physics. Namely, non-abelian Ising anyons of the bilayer KSL are confined in the transition to the RVB state. Implications and extensions of this study are discussed in various aspects such as (i) anyon-condensed multilayer construction of the Kitaev's sixteenfold way of anyon theories, (ii) additional vison condensation transition from the RVB to a valence bond solid (VBS) in the Kitaev bilayer system, (iii) dynamical anyon condensation in a non-Hermitian Kitaev bilayer, (iv) generalizations of our model to other lattice geometries, and (v) experimental realizations. This work puts together the two fascinating QSLs that are extensively studied in modern condensed matter and quantum physics into a concrete spin model, offering a comprehensive picture that unifies the anyon physics of the Kitaev spin liquids and the resonating valence bonds.

Engineering Higher-Order Dirac and Weyl Semimetallic phase in 3D Topolectrical Circuits
S. M. Rafi-Ul-Islam, Zhuo Bin Siu, Haydar Sahin, Mansoor B. A. Jalil
arXiv:2303.10911v2 Announce Type: replace Abstract: We propose a 3D topolectrical (TE) network that can be tuned to realize various higher-order topological gapless and chiral phases. We first study a higher-order Dirac semimetal phase that exhibits a hinge-like Fermi arc linking the Dirac points. This circuit can be extended to host highly tunable first- and second-order Weyl semimetal phases by introducing a non-reciprocal resistive coupling in the x-y plane that breaks time reversal symmetry. The first- and second-order Weyl points are connected by zero-admittance surface and hinge states, respectively. We also study the emergence of first- and second-order chiral modes induced by resistive couplings between similar nodes in the z-direction. These modes respectively occur in the midgap of the surface and hinge admittance bands in our circuit model without the need for any external magnetic field.

Identifying non-Abelian anyons with upstream noise
Misha Yutushui, David F. Mross
arXiv:2305.14422v2 Announce Type: replace Abstract: Non-Abelian phases are among the most highly-sought states of matter, with those whose anyons permit universal quantum gates constituting the ultimate prize. The most promising candidate of such a phase is the fractional quantum Hall plateau at filling factors $\nu=\frac{12}{5}$, which putatively facilitates Fibonacci anyons. Experimental validation of this assertion poses a major challenge and remains elusive. We present a measurement protocol that could achieve this goal with already-demonstrated experimental techniques. Interfacing the $\nu=\frac{12}{5}$ state with any readily-available Abelian state yields a binary outcome of upstream noise or no noise. Judicious choices of the Abelian states can produce a sequence of yes--no outcomes that fingerprint the possible non-Abelian phase by ruling out its competitors. Crucially, this identification is insensitive to the precise value of the measured noise and can uniquely identify the anyon type at filling factors $\nu=\frac{12}{5}$. In addition, it can distinguish any non-Abelian candidates at half-filling in graphene and semiconductor heterostructures.

One-Half Topological Number in Entangled Quantum Physics
Karyn Le Hur
arXiv:2308.14062v3 Announce Type: replace Abstract: A topological phase can be engineered in quantum physics from the Bloch sphere of a spin-1/2 showing an hedgehog structure as a result of a radial magnetic field. We elaborate on a relation between the formation of an entangled wavefunction at one pole, in a two-spins model, and an interesting pair of one-half topological numbers. Similar to Cooper pairs in superconductors, the Einstein-Podolsky-Rosen pair or Bell state produces a half flux quantization, which here refers to the halved flux of the Berry curvature on the surface. These 1/2-numbers also reveal the presence of a free Majorana fermion at a pole. The topological responses can be measured when driving from north to south and also from a circularly polarized field at the poles revealing the quantized or half-quantized nature of the protected transverse currents. We show applications of entangled wavefunctions in band structures, introducing a local topological marker in momentum space, to characterize the topological response of two-dimensional semimetals in bilayer geometries.

How heat propagates in liquid $^3$He
Kamran Behnia, Kostya Trachenko
arXiv:2309.00502v4 Announce Type: replace Abstract: In Landau's Fermi liquid picture, transport is governed by scattering between quasi-particles. The normal liquid $^3$He conforms to this picture but only at very low temperature. Here, we show that the deviation from the standard behavior is concomitant with the fermion-fermion scattering time falling below the Planckian time, $\frac{\hbar}{k_{\rm B}T}$ and the thermal diffusivity of this quantum liquid is bounded by a minimum set by fundamental physical constants and observed in classical liquids. This points to collective excitations (a sound mode) as carriers of heat. We propose that this mode has a wavevector of 2$k_F$ and a mean free path equal to the de Broglie thermal length. This would provide an additional conducting channel with a $T^{1/2}$ temperature dependence, matching what is observed by experiments. The experimental data from 0.007 K to 3 K can be accounted for, with a margin of 10\%, if thermal conductivity is the sum of two contributions: one by quasi-particles (varying as the inverse of temperature) and and another by sound (following the square root of temperature).

Hidden subsystem symmetry protected states in competing topological orders
Shi Feng
arXiv:2309.02307v2 Announce Type: replace Abstract: We reveal the connection between two-dimensional subsystem symmetry-protected topological (SSPT) states and two-dimensional topological orders via a self-dual frustrated toric code model. This model, an enrichment of the toric code (TC) with its dual interactions, can be mapped to a model defined on the dual lattice with subsystem symmetries and subextensive ground state degeneracy. The map connects exactly the frustrated TC to two copies of the topological plaquette Ising model (TPIM), as a strong SSPT model with linear subsystem symmetries. The membrane order parameter of the TPIM is exactly mapped to dual TC stabilizers as the order parameter of the frustrated TC model, SSPT gapless edge states of the TPIM are mapped to zero-energy dangling operators under open boundaries, and the transition from the SSPT-ordered TPIM to the trivial paramagnetic phase is mapped to the transition between two distinct topological orders. We also demonstrate that this mapping can be used to elucidate the structure of other SSPT models, reflecting the subtle linkage between SSPT order and topological order in two dimensions.

Diffusion with two resetting points
Pedro Juli\'an-Salgado, Leonardo Dagdug, Denis Boyer
arXiv:2311.11897v4 Announce Type: replace Abstract: We study the problem of a target search by a Brownian particle subject to stochastic resetting to a pair of sites. The mean search time is minimized by an optimal resetting rate which does not vary smoothly, in contrast with the well-known single site case, but exhibits a discontinuous transition as the position of one resetting site is varied while keeping the initial position of the particle fixed, or vice-versa. The discontinuity vanishes at a "liquid-gas" critical point in position space. This critical point exists provided that the relative weight $m$ of the further site is comprised in the interval $[2.9028...,8.5603...]$. When the initial position follows the resetting point distribution, a discontinuous transition also exists for the optimal rate as the distance between the resetting points is varied, provided that $m$ exceeds the critical value $m_c=6.6008...$ This setup can be mapped onto an intermittent search problem with switching diffusion coefficients and represents a minimal model for the study of distributed resetting.

Tilted Dirac superconductor at quantum criticality: Restoration of Lorentz symmetry
Pablo Reiser, Vladimir Juricic
arXiv:2311.12797v3 Announce Type: replace Abstract: Lorentz symmetry appears as a quite robust feature of the strongly interacting Dirac materials even though the lattice interactions break such a symmetry. We here demonstrate that the Lorentz symmetry is restored at the quantum-critical point (QCP) separating the tilted Dirac semimetal, breaking this symmetry already at the noninteracting level, from a gapped $s-$wave superconducting instability. To this end, we employ a one-loop $\epsilon=(3-D)-$expansion close to the $D=3$ upper critical dimension of the corresponding Gross-Neveu-Yukawa field theory. In particular, we show that the tilt parameter is irrelevant and ultimately vanishes at the QCP separating the two phases. In fact, as we argue here, such a Lorentz symmetry restoration may be generic for the strongly interacting tilted Dirac semimetals, irrespective of whether they feature mirror-symmetric or mirror-asymmetric tilting, and is also insensitive to whether the instability represents an insulator or a gapped superconductor. The proposed scenario can be tested in the quantum Monte Carlo simulations of the interacting tilted Dirac fermion lattice models.

Quantum Hall and Light Responses in a 2D Topological Semimetal
Karyn Le Hur, Sariah Al Saati
arXiv:2311.13922v3 Announce Type: replace Abstract: We have recently identified a protected topological semimetal in graphene which presents a zero-energy edge mode robust to disorder and interactions. Here, we address the characteristics of this semimetal and show that the $\mathbb{Z}$ topological invariant of the Hall conductivity associated to the lowest energy band can be equivalently measured from the resonant response to circularly polarized light resolved at the Dirac points. The (non-quantized) conductivity responses of the intermediate energy bands, including the Fermi surface, also give rise to a $\mathbb{Z}_2$ invariant. We emphasize on the bulk-edge correspondence as a half-topological protected semimetal, i.e. one spin-population polarized in the plane is in the insulating phase related to the robust edge mode while the other is in the metallic regime. The quantized transport at the edges is also equivalent to a $\frac{1}{2}-\frac{1}{2}$ conductance for spin polarizations along $z$ direction. We also build a parallel between the topological Hall response through the quantized light response at the Dirac points and a pair of half numbers (half Skyrmions).

Real-space Loop Current Pattern in Time-reversal-symmetry Breaking Phase in Kagome Metals
Koki Shimura, Rina Tazai, Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani
arXiv:2312.07256v2 Announce Type: replace Abstract: The charge loop current (cLC) state has attracted increasing attention in kagome metals. Here, we calculate the spontaneous currents along the nearest sites $i$ and $j$, $J_{i,j}$, induced by the cLC order that is the imaginary and odd-parity hopping integral modulation $\delta t_{i,j}$. We reveal that the magnitude of $J_{i,j}$ strongly depends on the nearest sites $i$ and $j$ in the $2\times2$ cLC state, where $\eta\equiv |\delta t_{i,j}|$ is equivalent for all nearest sites. The obtained $J_{i,j}$ becomes large near the van-Hove singularity (vHS) filling ($n\sim n_{vHS}$) even when $\eta$ is fixed. Interestingly, the obtained $J_{i,j}$ exhibits the logarithmic divergence behavior at low temperatures for $n\sim n_{vHS}$ with a fixed $\eta$, by reflecting the vHS points that are the characteristic of kagome metals. The present study provides useful information for local electronic state measurements, such as the site-selective NMR and STM experiments.

Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder
Marten Richter
arXiv:2312.14054v2 Announce Type: replace Abstract: Monolayers of transition metal dichalcogenides (TMDC) became one of the most studied nanostructures in the last decade. Combining two different TMDC monolayers results in a heterostructure whose properties can be individually tuned by the twist angle between the lattices of the two van-der-Waals layers and the relative placement of the layers, leading to Moir\'e cells. For small twist angles, lattice reconstruction leads to strong strain fields in the Moir\'e cells. In this paper, we combine an existing theory for lattice reconstruction with a quantum dynamic theory for interlayer excitons and their dynamics due to exciton phonon scattering using a polaron transformation. The exciton theory is formulated in real space instead of the commonly used quasi-momentum space to account for imperfections in the heterolayer breaking lattice translational symmetry. We can analyze the structure of the localized and delocalized exciton states and their exciton-phonon scattering rates for single phonon processes using Born-Markov approximation and multi-phonon processes using a polaron transformation. Furthermore, linear optical spectra and exciton relaxation Green functions are calculated and discussed. A P-stacked MoSe$_2$/WSe$_2$ heterolayer is used as an illustrative example. It shows excitons localized in the potential generated through the Moir\'e-pattern and strain and a delocalized continuum. The exciton-phonon relaxation times vary depending on the strain and range from sub-pico seconds up to nanoseconds.

Interplay of superexchange and vibronic effects in the hidden order of Ba$_2$MgReO$_6$ unravelled from first principles
Dario Fiore Mosca, Cesare Franchini, Leonid V. Pourovskii
arXiv:2402.15564v2 Announce Type: replace Abstract: The origin of the "hidden" quadrupolar and unconventional magnetic low-temperature orders observed in the spin-orbit double perovskite Ba$_2$MgReO$_6$ defies explanation through standard experimental and theoretical techniques. Here we address this problem by deriving and solving an ab initio low-temperature effective Hamiltonian including inter-site electronic exchange and vibronic (electron-lattice) couplings between $J_{eff}=3/2$ Jahn-Teller-active Rhenium states. Our findings disclose the nature of these elusive states, attributing it to intertwined exchange and electron-lattice couplings, thus diverging from the conventional dichotomy of purely electronic or lattice driving mechanisms. Our results indicate the resilience of the quadrupolar hidden order under pressure, yet its rapid suppression under uniaxial strain suggests that external or lattice-induced distortions play a pivotal role in determining the relative stability of competing phases in Ba$_2$MgReO$_6$ and similar $d^1$ double perovskites.

Scalable Superconductor Neuron with Ternary Synaptic Connections for Ultra-Fast SNN Hardware
Mustafa Altay Karamuftuoglu, Beyza Zeynep Ucpinar, Arash Fayyazi, Sasan Razmkhah, Mehdi Kamal, Massoud Pedram
arXiv:2402.16384v2 Announce Type: replace Abstract: A novel high-fan-in differential superconductor neuron structure designed for ultra-high-performance Spiking Neural Network (SNN) accelerators is presented. Utilizing a high-fan-in neuron structure allows us to design SNN accelerators with more synaptic connections, enhancing the overall network capabilities. The proposed neuron design is based on superconductor electronics fabric, incorporating multiple superconducting loops, each with two Josephson Junctions. This arrangement enables each input data branch to have positive and negative inductive coupling, supporting excitatory and inhibitory synaptic data. Compatibility with synaptic devices and thresholding operation is achieved using a single flux quantum (SFQ) pulse-based logic style. The neuron design, along with ternary synaptic connections, forms the foundation for a superconductor-based SNN inference. To demonstrate the capabilities of our design, we train the SNN using snnTorch, augmenting the PyTorch framework. After pruning, the demonstrated SNN inference achieves an impressive 96.1% accuracy on MNIST images. Notably, the network exhibits a remarkable throughput of 8.92 GHz while consuming only 1.5 nJ per inference, including the energy consumption associated with cooling to 4K. These results underscore the potential of superconductor electronics in developing high-performance and ultra-energy-efficient neural network accelerator architectures.

Found 6 papers in prb
Date of feed: Wed, 28 Feb 2024 04:17:05 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)

Secondary proximity effect in a side-coupled double quantum dot structure
Jia-Ning Wang, Yong-Chen Xiong, Wang-Huai Zhou, Tan Peng, and Ziyu Wang
Author(s): Jia-Ning Wang, Yong-Chen Xiong, Wang-Huai Zhou, Tan Peng, and Ziyu Wang

Semiconductor quantum dots in close proximity to superconductors may provoke localized bound states within the superconducting energy gap known as the Yu-Shiba-Rusinov state, which is a promising candidate for constructing Majorana zero modes and topological qubits. Side-coupled double quantum dot s…

[Phys. Rev. B 109, 064518] Published Tue Feb 27, 2024

Fractal subsystem symmetries, 't Hooft anomalies, and UV/IR mixing
Heitor Casasola, Guilherme Delfino, Pedro R. S. Gomes, and Paula F. Bienzobaz
Author(s): Heitor Casasola, Guilherme Delfino, Pedro R. S. Gomes, and Paula F. Bienzobaz

In this work, we study unconventional anisotropic topologically ordered phases in $3d$ that manifest type-II fractonic physics along submanifolds. While they behave as usual topological order along a preferred spatial direction, their physics along perpendicular planes is dictated by the presence of…

[Phys. Rev. B 109, 075164] Published Tue Feb 27, 2024

Atomistic theory of the moiré Hofstadter butterfly in magic-angle graphene
Alina Wania Rodrigues, Maciej Bieniek, Paweł Potasz, Daniel Miravet, Ronny Thomale, Marek Korkusiński, and Paweł Hawrylak
Author(s): Alina Wania Rodrigues, Maciej Bieniek, Paweł Potasz, Daniel Miravet, Ronny Thomale, Marek Korkusiński, and Paweł Hawrylak

We present here a Hofstadter's butterfly spectrum for the magic-angle twisted bilayer graphene obtained using an ab initio-based multimillion-atom tight-binding model. We incorporate a hexagonal boron nitride substrate and out-of-plane atomic relaxation. The effects of a magnetic field are introduce…

[Phys. Rev. B 109, 075166] Published Tue Feb 27, 2024

Design of spin-orbital texture in ferromagnetic/topological insulator interfaces
A. L. Araújo, F. Crasto de Lima, C. H. Lewenkopf, and A. Fazzio
Author(s): A. L. Araújo, F. Crasto de Lima, C. H. Lewenkopf, and A. Fazzio

Spin-orbital texture in topological insulators due to the spin locking with the electron momentum play an important role in spintronic phenomena that arise from the interplay between charge and spin degrees of freedom. We have explored interfaces between a ferromagnetic system $({\mathrm{CrI}}_{3})$…

[Phys. Rev. B 109, 085142] Published Tue Feb 27, 2024

Electrically tunable fine structure of negatively charged excitons in gated bilayer graphene quantum dots
Katarzyna Sadecka, Yasser Saleem, Daniel Miravet, Matthew Albert, Marek Korkusinski, Gabriel Bester, and Pawel Hawrylak
Author(s): Katarzyna Sadecka, Yasser Saleem, Daniel Miravet, Matthew Albert, Marek Korkusinski, Gabriel Bester, and Pawel Hawrylak

We predict here the fine structure of an electrically tunable negatively charged exciton (trion) composed of two electrons and a hole confined in a gated bilayer graphene quantum dot (QD). We start with an atomistic approach, allowing us to compute confined electron and confined hole QD states for a…

[Phys. Rev. B 109, 085434] Published Tue Feb 27, 2024

Scattering description of edge states in Aharonov-Bohm triangle chains
Zhi-Hai Liu, O. Entin-Wohlman, A. Aharony, J. Q. You, and H. Q. Xu
Author(s): Zhi-Hai Liu, O. Entin-Wohlman, A. Aharony, J. Q. You, and H. Q. Xu

Scattering theory has been suggested as a convenient method to identify topological phases of matter, in particular of disordered systems for which the Bloch band-theory approach is inapplicable. Here we examine this idea, employing as a benchmark a one-dimensional triangle chain whose versatility y…

[Phys. Rev. B 109, L081408] Published Tue Feb 27, 2024

Found 5 papers in prl
Date of feed: Wed, 28 Feb 2024 04:17:03 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)

Self-Similar Growth of Bose Stars
A. S. Dmitriev, D. G. Levkov, A. G. Panin, and I. I. Tkachev
Author(s): A. S. Dmitriev, D. G. Levkov, A. G. Panin, and I. I. Tkachev

We analytically solve the problem of Bose star growth in the bath of gravitationally interacting particles. We find that after nucleation of this object, the bath is described by a self-similar solution of the kinetic equation. Together with the conservation laws, this fixes mass evolution of the Bo…

[Phys. Rev. Lett. 132, 091001] Published Tue Feb 27, 2024

Binary Coalescences as Sources of Ultrahigh-Energy Cosmic Rays
Jonas P. Pereira, Carlos H. Coimbra-Araújo, Rita C. dos Anjos, and Jaziel G. Coelho
Author(s): Jonas P. Pereira, Carlos H. Coimbra-Araújo, Rita C. dos Anjos, and Jaziel G. Coelho

Binary coalescences are known sources of gravitational waves (GWs) and they encompass combinations of black holes (BHs) and neutron stars (NSs). Here we show that when BHs are embedded in magnetic fields ($B$’s) larger than approximately ${10}^{10}\text{ }\text{ }\mathrm{G}$, charged particles colli…

[Phys. Rev. Lett. 132, 091401] Published Tue Feb 27, 2024

Quantum Spectral Analysis by Continuous Measurement of Landau-Zener Transitions
Christopher C. Bounds, Josh P. Duff, Alex Tritt, Hamish A. M. Taylor, George X. Coe, Sam J. White, and L. D. Turner
Author(s): Christopher C. Bounds, Josh P. Duff, Alex Tritt, Hamish A. M. Taylor, George X. Coe, Sam J. White, and L. D. Turner

We demonstrate the simultaneous estimation of signal frequency and amplitude by a single quantum sensor in a single experimental shot. Sweeping the qubit splitting linearly across a span of frequencies induces a nonadiabatic Landau-Zener transition as the qubit crosses resonance. The signal frequenc…

[Phys. Rev. Lett. 132, 093401] Published Tue Feb 27, 2024

Electric-Field-Tunable Edge Transport in Bernal-Stacked Trilayer Graphene
Saurabh Kumar Srivastav, Adithi Udupa, K. Watanabe, T. Taniguchi, Diptiman Sen, and Anindya Das
Author(s): Saurabh Kumar Srivastav, Adithi Udupa, K. Watanabe, T. Taniguchi, Diptiman Sen, and Anindya Das

This Letter presents a nonlocal study on the electric-field-tunable edge transport in $h$-BN-encapsulated dual-gated Bernal-stacked ($ABA$) trilayer graphene across various displacement fields ($D$) and temperatures ($T$). Our measurements revealed that the nonlocal resistance (${R}_{NL}$) surpassed…

[Phys. Rev. Lett. 132, 096301] Published Tue Feb 27, 2024

Comment on “Trivial Andreev Band Mimicking Topological Bulk Gap Reopening in the Nonlocal Conductance of Long Rashba Nanowires”
Sankar Das Sarma and Haining Pan
Author(s): Sankar Das Sarma and Haining Pan
[Phys. Rev. Lett. 132, 099601] Published Tue Feb 27, 2024

Found 1 papers in prx
Date of feed: Wed, 28 Feb 2024 04:17:03 GMT

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Anisotropic Quantum Hall Droplets
Blagoje Oblak, Bastien Lapierre, Per Moosavi, Jean-Marie Stéphan, and Benoit Estienne
Author(s): Blagoje Oblak, Bastien Lapierre, Per Moosavi, Jean-Marie Stéphan, and Benoit Estienne

Most studies of quantum Hall droplets—2D electron fluids in strong magnetic fields—focus on isotropic cases. A first-principles analysis predicts behaviors of anisotropic droplets and proposes experimental signatures.

[Phys. Rev. X 14, 011030] Published Tue Feb 27, 2024

Found 1 papers in pr_res
Date of feed: Wed, 28 Feb 2024 04:17:06 GMT

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Strain-engineered magnon states in two-dimensional ferromagnetic monolayers
Bin Wei, Jia-Ji Zhu, Yun Song, and Kai Chang
Author(s): Bin Wei, Jia-Ji Zhu, Yun Song, and Kai Chang

We systematically investigate the strain-engineered magnon states in two-dimensional (2D) ferromagnetic monolayers. By suitable engineering of an inhomogeneous strain, we demonstrate the emergence of magnon Landau levels and magnon snake states in 2D ferromagnetic monolayers. We show a magnon valley…

[Phys. Rev. Research 6, 013210] Published Tue Feb 27, 2024

Found 1 papers in nano-lett
Date of feed: Tue, 27 Feb 2024 14:19:04 GMT

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[ASAP] Resonant Tunneling-Enhanced Photoresponsivity in a Twisted Graphene van der Waals Heterostructure
Binghe Xie, Jiaxin Wu, Junning Mei, Shuangxing Zhu, Ruan Zhang, Feifan Gu, Kenji Watanabe, Takashi Taniguchi, and Xinghan Cai

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Nano Letters
DOI: 10.1021/acs.nanolett.3c05131

Found 1 papers in acs-nano
Date of feed: Tue, 27 Feb 2024 14:14:17 GMT

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[ASAP] Dual-Limit Growth of Large-Area Monolayer Transition Metal Dichalcogenides
Zeqin Xin, Xiaolong Zhang, Jing Guo, Yonghuang Wu, Bolun Wang, Run Shi, and Kai Liu

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ACS Nano
DOI: 10.1021/acsnano.3c09222

Found 1 papers in nat-comm

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Observation of continuum Landau modes in non-Hermitian electric circuits
< author missing >

Found 2 papers in small
Date of feed: Tue, 27 Feb 2024 08:23:27 GMT

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Encapsulating Bi Nanoparticles in Reduced Graphene Oxide with Strong Interfacial Bonding toward Advanced Potassium Storage
Yi Wei, Peng Zhang, Shujie Zhou, Xue Tian, Razium Ali Soomro, Huan Liu, Huiling Du, Bin Xu
Small, EarlyView.

Optimizing Electron Spin‐Polarized States of MoSe2/Cr2Se3 Heterojunction‐Embedded Carbon Nanospheres for Superior Sodium/Potassium‐Ion Battery Performances
Xianchao Wang, Xuan Zhang, Ye Chen, Jinqiao Dong, Jing Zhao
Small, EarlyView.