Found 37 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)

Two Ultracold Atoms in a Quasi-Two-Dimensional Box Confinement
Fan Yang, Ruijie Du, Ran Qi, Peng Zhang
arXiv:2403.02349v1 Announce Type: new Abstract: We investigate the scattering and two-body bound states of two ultracold atoms in a quasi-two-dimensional (quasi-2D) confinement, with the confinement potential being an infinite square well (box potential) in the transverse ($z$-) direction, and the motion of the atoms in the $x$-$y$ plane being free. Specifically, we calculate the effective 2D scattering length and 2D effective range of the low-energy scattering, as well as the energy and the transverse-excited-mode probability of the bound states. Comparing these results with those obtained under a harmonic transverse confinement potential, we find that in most of the cases the 2D effective range for the box confinement is approximately 0.28 of the one for the harmonic confinement. Moreover, the transverse-excited-mode probability of the bound states for the box confinement is also much lower than the one for the harmonic confinement. These results suggest that the transverse excitation in the box confinement is notably weaker than the one in a harmonic confinement. Therefore, achieving quasi-2D ultracold gases well-described by pure-2D effective models, particularly those with 2D contact interaction, is more feasible through box confinement. Our results are helpful for the quantum simulation of 2D many-body physics with ultracold atoms, e.g., the suppression of 2D effective range may lead to an enhancement of quantum anomaly in two-dimensional Fermi Gases. Additionally, our calculation method is applicable to the two-body problems of ultracold atoms in other types of quasi-2D confinements.

Characterizing Dynamic Majorana Hybridization for Universal Quantum Computing
Themba Hodge, Eric Mascot, Dan Crawford, Stephan Rachel
arXiv:2403.02481v1 Announce Type: new Abstract: Qubits built out of Majorana zero modes have long been theorized as a potential pathway toward fault-tolerant topological quantum computation. Almost unavoidable in these processes is Majorana wavefunction overlap, known as hybridization, which arise throughout the process when Majorana modes get close to each other. This breaks the ground state degeneracy, leading to qubit errors in the braiding process. This work presents an accessible method to track transitions within the low-energy subspace and predict the output of braids with hybridized Majorana modes. As an application, we characterize Pauli qubit-errors, as demonstrated on an X-gate, critical for the successful operation of any quantum computer. Further, we perform numerical simulations to demonstrate how to utilize the hybridization to implement arbitrary rotations, along with a two-qubit controlled magic gate, thus providing a demonstration of universal quantum computing.

Direct visualization of defect-controlled diffusion in van der Waals gaps
Joachim Dahl Thomsen, Yaxian Wang, Henrik Flyvbjerg, Kenji Watanabe, Takashi Taniguchi, Prineha Narang, Frances M. Ross
arXiv:2403.02494v1 Announce Type: new Abstract: Diffusion processes govern fundamental phenomena such as phase transformations, doping, and intercalation in van der Waals (vdW) bonded materials. Here, we quantify the diffusion dynamics of W atoms by visualizing the motion of individual atoms at three different vdW interfaces, BN/vacuum, BN/BN, and BN/WSe2, using scanning transmission electron microscopy movies. Supported by density functional theory calculations, we infer that in all cases diffusion is governed by intermittent trapping at electron beam-generated defect sites. This leads to diffusion properties that depend strongly on the number of defects. These results suggest that diffusion and intercalation processes in vdW materials are highly tunable and sensitive to crystal quality. Furthermore, the demonstration of atomic resolution imaging of materials inside vdW heterostructures offers possibilities for direct visualization of diffusion and atomic interactions, as well as for experiments exploring atomic structures, their in-situ modification, and electrical property measurement.

Quantum critical fluctuations generate intensely magnetic field-resilient superconductivity in UTe2
Z. Wu, T. I. Weinberger, A. J. Hickey, D. V. Chichinadze, D. Shaffer, A. Cabala, H. Chen, M. Long, T. J. Brumm, W. Xie, Y. Lin, Y. Skourski, Z. Zengwei, D. E. Graf, V. Sechovsky, G. G. Lonzarich, 1 M. Valiska, F. M. Grosche, A. G. Eaton
arXiv:2403.02535v1 Announce Type: new Abstract: Quantum critical phase boundaries (QCPBs) -- where a continuous phase transition occurs at zero temperature -- have been found to nucleate novel electronic states in a number of strongly correlated materials. Emergent electronic phases, such as unconventional superconductivity, frequently occur in close proximity to a QCPB. However, the antagonism between magnetic field and superconductivity generally suppresses such superconductive phases to modest magnetic field ranges, except in notable cases such as the high-$T_\text{c}$ cuprates. Here we show that the heavy fermion Kondo-lattice system UTe$_2$ possesses a QCPB at remarkably high magnetic fields $\sim$ 50 T, underpinning an extremely high field superconducting state that persists to fields $> \sim$ 70 T despite its relatively modest transition temperature of $T_\text{c} \approx$ 2 K. Whereas previous studies found this superconducting state to exist exclusively inside a field-polarised paramagnetic host-phase accessed following a first-order metamagnetic transition, for magnetic field tilt angles in the rotation plane connecting the reciprocal (010) and (101) vectors, we find an extended region of this superconductivity outside the field-polarised state. In this special rotation plane we also observe a pronounced suppression of the metamagnetic transition towards zero temperature, revealing that the metamagnetic transition surface ends at a QCPB. The superconducting $T_\text{c}$ exhibits a strong angular dependence and is enhanced close to the QCPB, where the onset of superconductivity is stretched over a surprisingly large magnetic field range reaching as low as 30 T. We model our data by a phenomenological Ginzburg-Landau theory, and show how an extended quantum critical line -- rather than a more conventional QCPB at a singular point -- anchors the remarkable high magnetic field phase landscape of UTe$_2$.

Enhancing Magnetocaloric Material Discovery: A Machine Learning Approach Using an Autogenerated Database by Large Language Models
Jiaoyue Yuan, Runqing Yang, Lokanath Patra, Bolin Liao
arXiv:2403.02553v1 Announce Type: new Abstract: Magnetic cooling based on the magnetocaloric effect is a promising solid-state refrigeration technology for a wide range of applications in different temperature ranges. Previous studies have mostly focused on near room temperature (300 K) and cryogenic temperature (< 10 K) ranges, while important applications such as hydrogen liquefaction call for efficient magnetic refrigerants for the intermediate temperature 10K to 100 K. For efficient use in this range, new magnetocaloric materials with matching Curie temperatures need to be discovered, while conventional experimental approaches are typically time-consuming and expensive. Here, we report a computational material discovery pipeline based on a materials database containing more than 6000 entries auto-generated by extracting reported material properties from literature using a large language model. We then use this database to train a machine learning model that can efficiently predict magnetocaloric properties of materials based on their chemical composition. We further verify the magnetocaloric properties of predicted compounds using ab initio atomistic spin dynamics simulations to close the loop for computational material discovery. Using this approach, we identify 11 new promising magnetocaloric materials for the target temperature range. Our work demonstrates the potential of combining large language models, machine learning, and ab initio simulations to efficiently discover new functional materials.

Revealing the EuCd_{2}As_{2} Semiconducting Band Gap via n-type La-Doping
Ryan A. Nelson, Jesaiah King, Shuyu Cheng, Archibald J. Williams, Christopher Jozwiak, Aaron Bostwick, Eli Rotenberg, Souvik Sasmal, I-Hsuan Kao, Aalok Tiwari, Natalie R. Jones, Chuting Cai, Emma Martin, Andrei Dolocan, Li Shi, Roland Kawakami, Joseph P. Heremans, Jyoti Katoch, Joshua E. Goldberger
arXiv:2403.02556v1 Announce Type: new Abstract: EuCd_{2}As_{2} has attracted considerable interest as one of the few magnetic Weyl semimetal candidate materials, although recently there have been emerging reports that claim it to have a semiconducting electronic structure. To resolve this debate, we established the growth of n-type EuCd_{2}As_{2} crystals, to directly visualize the nature of the conduction band using angle resolve photoemission spectroscopy (ARPES). We show that La-doping leads to n-type transport signatures in both the thermopower and Hall effect measurements, in crystals with doping levels at 2 - 6 x 10^{17} e^{-} cm^{-3}. Both p-type and n-type doped samples exhibit antiferromagnetic ordering at 9 K. ARPES experiments at 6 K clearly show the presence of the conduction band minimum at 0.8 eV above the valence band maximum, which is further corroborated by the observation of a 0.71 - 0.72 eV band gap in room temperature diffuse reflectance absorbance measurements. Together these findings unambiguously show that EuCd_{2}As_{2} is indeed a semiconductor with a substantial band gap and not a topological semimetal.

Topological protection revealed by real-time longitudinal and transverse studies
Anh Ho Hoai, Jian Huang, L. N. Pfeiffer, K. W. West
arXiv:2403.02575v1 Announce Type: new Abstract: Topology provides an essential concept for achieving unchanged (or protected) quantum properties in the presence of perturbations. A challenge facing realistic applications is that the level of protection displayed in real systems is subject to substantial variations. Some key differences stem from mechanisms influencing the reconstruction behaviors of extended dissipationless modes. Despite various insightful results on potential causes of backscattering, the edge-state-based approach is limited because the bulk states, as shown by breakdown tests, contribute indispensably. This study investigates the influence of bulk reconstruction where dissipationless modes are global objects instead of being restricted to the sample edge. An integer quantum Hall effect (IQHE) hosted in a Corbino sample geometry is adopted and brought continuously to the verge of a breakdown. A detection technique is developed to include two independent setups capable of simultaneously capturing the onset of dissipation in both longitudinal and transverse directions. The real-time correspondence between orthogonal results confirms two facts. 1. Dissipationless charge modes undergo frequent reconstruction in response to electrochemical potential changes, causing dissipationless current paths to expand transversely into the bulk while preserving chirality. A breakdown only occurs when a backscattering emerges between reconfigured dissipationless current paths bridging opposite edge contacts. 2. Impurity screening is vital in enhancing protection, and topological protection is subject to an intriguing interplay of disorder, electron-electron interaction, and topology. The proposed reconstruction mechanism qualitatively explains the robustness variations, beneficial for developing means for optimization.

The de Haas-van Alphen quantum oscillations in the kagome metal RbTi3Bi5
Zixian Dong, Lei Shi, Bing Wang, Mengwu Huo, Xing Hua, Chaoxin Huang, Peiyue Ma, Yunwei Zhang, Bing Shen, Meng Wang
arXiv:2403.02577v1 Announce Type: new Abstract: Kagome system usually attracts great interest in condensed matter physics due to its unique structure hosting various exotic states such as superconductivity (SC), charge density wave (CDW), and nontrivial topological states. Topological semimetal RbTi3Bi5 consisting of the kagome layer of Ti shares a similar crystal structure to topological correlated materials AV3Sb5 (A = K, Rb, Cs) but with the absence of CDW and SC. Systematic de Haas-van Alphen (dHvA) oscillation measurements are performed on the single crystals of RbTi3Bi5 to pursue nontrivial topological physics and exotic states. Combining with theoretical calculations, detailed Fermi surface topology and band structure are investigated. A two-dimensional (2D) Fermi pocket \b{eta} is revealed with a light-effective mass in consistent with the semimetal predictions. Landau Fan of RbTi3Bi5 reveals a zero Berry phase for the \b{eta} oscillation in contrast to that of CsTi3Bi5. These results suggest the kagome RbTi3Bi5 is a good candidate to explore nontrivial topological exotic states and topological correlated physics.

Novel Dipole-Lattice coupling in the Quantum-Spin-Liquid Material $\kappa$-Cu-CN
Jesse LiebmanJohns Hopkins University, Kazuya MiyagawaUniversity of Tokyo, Kazushi KanodaUniversity of Tokyo, Natalia DrichkoJohns Hopkins University
arXiv:2403.02676v1 Announce Type: new Abstract: A family of molecular Mott insulators on triangular lattice provided a few S=1/2 triangular quantum spin liquid candidates, with $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ being the most studied material of this group. The large number experimental work presented a conflicting set of evidence, some suggesting spin liquid behavior, while other pointing on deceased magnetization reminding of a valence bond solid with orphan spins. In this work we use Raman scattering spectroscopy to probe both local charge on molecular sites and lattice phonons as a function of temperature down to 6K. Based on the analysis of the increasing width of Gaussian line shape of the BEDT-TTF charge sensitive vibration $\nu_2$ on colling below 40 K we suggest a development of disordered fluctuating charge disproportionation on (BEDT-TTF)$_2$ dimers of amplitude as small as 0.06$e$. The lattice phonons show strong anomalous broadening on cooling only in (c,c) scattering channel, associated with the developing charge disproportionation. We suggest an interpretation, where the coupling of disordered charge dipoles on dimers to the lattice results in anisotropic modulation of charge transfer integrals between dimer lattice sites. Such fluctuation would results in fluctuations of magnetic coupling between spins which can produce short lived charge ordered spin-singlet pairs.

Strain tunable electronic ground states in two-dimensional iridate thin films
Donghan Kim, Byungmin Sohn, Yeonjae Lee, Jeongkeun Song, Mi Kyung Kim, Minjae Kim, Tae Won Noh, Changyoung Kim
arXiv:2403.02734v1 Announce Type: new Abstract: Quantum phases of matter such as superconducting, ferromagnetic and Wigner crystal states are often driven by the two-dimensionality (2D) of correlated systems. Meanwhile, spin-orbit coupling (SOC) is a fundamental element leading to nontrivial topology which gives rise to quantum phenomena such as the large anomalous Hall effect and nontrivial superconductivity. However, the search for controllable platforms with both 2D and SOC has been relatively overlooked so far. Here, we control and study the electronic ground states of iridate ultrathin films having both 2D and SOC by angle-resolved photoemission spectroscopy (ARPES) and dynamical mean field theory (DMFT) calculations. The metallicity of SrIrO$_3$ ultrathin films is controlled down to a monolayer by dimensional and strain manipulation. Our results suggest that the iridate ultrathin films can be a controllable 2D SOC platform exhibiting a variety of phenomena for future functional devices.

Emergence of biconnected clusters in explosive percolation
Liwenying Yang, Ming Li
arXiv:2403.02789v1 Announce Type: new Abstract: By introducing a simple competition mechanism for the insertion of bonds in random graphs, the explosive percolation demonstrates a sharped phase transition with rich critical phenomena. In this paper, we study the high-order connectivity in the explosive percolation by the event-based ensemble, focusing on the biconnected cluster, in which any two sites are connected by at least two independent paths. Although the biconnected clusters are formed only by inserting intra-cluster bonds, we numerically confirm that the percolation threshold of the biconnected cluster is independent of a special competition mechanism for the intra-cluster bond, instead, it shares the same value with the percolation of simply connected clusters. Moreover, it is very interesting that the volume fractal dimension of the biconnected clusters $d_{f}'$ varies when different competition mechanisms are applied to intra-cluster bonds. The fit results suggest that $d_{f}'$ is much smaller than the volume fractal dimension of the connected cluster $d_{f}$, indicating a non-explosive transition of the biconnected cluster. The size distribution of biconnected clusters shows a double-scaling behavior -- the size distribution of large clusters is still governed by the standard Fisher exponent derived from the hyperscaling relation $\tau'=1+1/d_{f}'$, while a modified Fisher exponent $\tau_0\leq1$ is found for small clusters. The value of $\tau_0$, and the crossover of the two scalings depends on the competition mechanism of intra-cluster bonds. All these demonstrate that the high-order connectivity also shows some unusual features by simply suppressing the growth of clusters in the percolation model.

Nonlinear Thouless Pumping of Solitons Across an Impurity
Xunzhen Cao, Chunyu Jia, Ying Hu, Zhaoxin Liang
arXiv:2403.02800v1 Announce Type: new Abstract: The nonlinear Thouless pumping is an exciting frontier of topological physics. While recent works have revealed the quantized motion of solitons in Thouless pumps, the interplay between the topology, nonlinearity and disorder remains largely unexplored. Here, we investigate the nonlinear Thouless pumping of solitons in the presence of an impurity in the context of a Bose-Einstein condensate. Using both the Gross-Pitaevskii equation and Lagrangian variational approach, we analyze the interaction between a moving soliton and an impurity. Without the pump, the soliton can pass through a light impurity, but gets trapped by the impurity with large mass. In marked contrast, we find the soliton in Thouless pumps can always transit through the impurity, and its motion is topologically quantized. Our result explicitly showcases the robustness of topological soliton pumping against microscopic imperfections, and opens a new perspective in the information processing with solitons.

Review of Nanolayered Post-transition Metal Monochalcogenides: Synthesis, Properties, and Applications
Mingyu Yu, Maria Hilse, Qihua Zhang, Yongchen Liu, Zhengtianye Wang, Stephanie Law
arXiv:2403.02956v1 Announce Type: new Abstract: Nanolayered post-transition metal monochalcogenides (PTMMCs) stand out as promising advanced two-dimensional (2D) materials. Beyond inheriting the general advantages associated with traditional 2D materials, they exhibit unique properties, including a wide bandgap range covering the ultraviolet to the mid-infrared spectral ranges, thickness-dependent bandgap behaviors, good nonlinear optical performance, high thermoelectric coefficients, and ferroelectricity. Consequently, these materials hold significant potential in diverse applications such as photodetectors, field effect transistors, thermoelectrics, ferroelectrics, photovoltaics, and electrochemical devices, especially in the manufacturing of nanoscale devices. However, there is still a lack of systematic understanding of the PTMMC family. This study provides a broad overview of the crystal structures, bandgap structures, synthesis methods, physical properties, and state-of-the-art applications of PTMMC materials with a motif of X-M-M-X (M=Ga, In, Ge, Sn; X=S, Se, Te). An outlook for the development trends is emphasized at the end, underscoring the critical importance of this work to the future exploration of nanolayered PTMMCs.

Generation of gigahertz frequency surface acoustic waves in YIG/ZnO heterostructures
Finlay Ryburn, Kevin K\"unstle, Yangzhan Zhang, Yannik Kunz, Timmy Reimann, Morris Lindner, Carsten Dubs, John F. Gregg, Mathias Weiler
arXiv:2403.03006v1 Announce Type: new Abstract: We study surface acoustic waves (SAWs) in yttrium iron garnet (YIG)/zinc oxide (ZnO) heterostructures, comparing the results of a computationally lightweight analytical model with time-resolved micro-focused Brillouin light scattering data. Interdigital transducers (IDTs), with operational frequencies in the gigahertz regime, were fabricated on 50 and 100nm thin films of YIG prior to sputter deposition of 830nm and 890nm films of piezoelectric ZnO. We find good agreement between our analytical model and micro-focused Brillouin light scattering data of the IDT frequency response and SAW group velocity, with clear differentiation between the Rayleigh and Sezawa-like modes. This work paves the way for the study of SAW-spin wave (SW) interactions in low SW damping YIG, with the possibility of a method for future energy-efficient SW excitation.

Transition from topological to chaos in the nonlinear Su-Schrieffer-Heeger model
Kazuki Sone, Motohiko Ezawa, Zongping Gong, Taro Sawada, Nobuyuki Yoshioka, Takahiro Sagawa
arXiv:2403.03038v1 Announce Type: new Abstract: Recent studies on topological insulators have expanded into the nonlinear regime, while the bulk-edge correspondence in strongly nonlinear systems has been unelucidated. Here, we reveal that nonlinear topological edge modes can exhibit a transition to spatial chaos by increasing nonlinearity, which can be a universal mechanism of the breakdown of the bulk-edge correspondence. Specifically, we unveil the underlying dynamical system describing the spatial distribution of zero modes and show the emergence of chaos. We also propose the correspondence between the absolute value of the topological invariant and the dimension of the stable manifold under sufficiently weak nonlinearity. Our results provide a general guiding principle to investigate the nonlinear bulk-edge correspondence that can potentially be extended to arbitrary dimensions.

Internal consistency of multi-tier $GW$+EDMFT
Ruslan Mushkaev, Francesco Petocchi, Viktor Christiansson, Philipp Werner
arXiv:2403.03044v1 Announce Type: new Abstract: The multi-tier $GW$+EDMFT scheme is an ab-initio method for calculating the electronic structure of correlated materials. While the approach is free from ad-hoc parameters, it requires a selection of appropriate energy windows for describing low-energy and strongly correlated physics. In this study, we test the consistency of the multi-tier description by considering different low-energy windows for a series of cubic SrXO$_3$ (X=V,Cr,Mn) perovskites. Specifically, we compare the 3-orbital $t_{2g}$ model, the 5-orbital $t_{2g}+e_g$ model, the 12-orbital $t_{2g}+O_p$ model, and (in the case of SrVO$_3$) the 14-orbital $t_{2g}+e_g+O_p$ model and compare the results to available photoemission and X-ray absorption measurements. The multi-tier method yields consistent results for the $t_{2g}$ and $t_{2g}+e_g$ low-energy windows, while the models with $O_p$ states produce stronger correlation effects and mostly agree well with experiment, especially in the unoccupied part of the spectrum. We also discuss the consistency between the fermionic and bosonic spectral functions and the physical origin of satellite features, and present momentum-resolved charge susceptibilities.

Critical magnetic flux for Weyl points in the three-dimensional Hofstadter model
Pierpaolo Fontana, Andrea Trombettoni
arXiv:2403.03047v1 Announce Type: new Abstract: We investigate the band structure of the three-dimensional Hofstadter model on cubic lattices, with an isotropic magnetic field oriented along the diagonal of the cube with flux $\Phi=2 \pi \cdot m /n$, where $m,n$ are co-prime integers. Using reduced exact diagonalization in momentum space, we show that, at fixed $m$, there exists an integer $n(m)$ associated with a specific value of the magnetic flux, that we denote by $\Phi_c(m) \equiv 2 \pi \cdot m/n(m)$, separating two different regimes. The first one, for fluxes $\Phi<\Phi_c(m)$, is characterized by complete band overlaps, while the second one, for $\Phi>\Phi_c(m)$, features isolated band touching points in the density of states and Weyl points between the $m$- and the $(m+1)$-th bands. In the Hasegawa gauge, the minimum of the $(m+1)$-th band abruptly moves at the critical flux $\Phi_c(m)$ from $k_z=0$ to $k_z=\pi$. We then argue that the limit for large $m$ of $\Phi_c(m)$ exists and it is finite: $\lim_{m\to \infty} \Phi_c(m) \equiv \Phi_c$. Our estimate is $\Phi_c/2\pi=0.1296(1)$. Based on the values of $n(m)$ determined for integers $m\leq60$, we propose a mathematical conjecture for the form of $\Phi_c(m)$ to be used in the large-$m$ limit. The asymptotic critical flux obtained using this conjecture is $\Phi_c^{{\rm (conj)}}/2\pi=7/54$.

Topological balance of cell distributions in plane monolayers
Daria S. Roshal, Kirill K. Fedorenko, Marianne Martin, Stephen Baghdiguian, Sergei B. Rochal
arXiv:2403.03079v1 Announce Type: new Abstract: Most of normal proliferative epithelia of plants and metazoans are topologically invariant and characterized by similar cell distributions according to the number of cell neighbors (DCNs). Here we study peculiarities of these distributions and explain why the DCN obtained from the location of intercellular boundaries and that based on the Voronoi tessellation with nodes located on cell nuclei may differ from each other. As we demonstrate, special microdomains where four or more intercellular boundaries converge are topologically charged. Using this fact, we deduce a new equation describing the topological balance of the DCNs. The developed theory is applied for a series of microphotographs of non-tumoral epithelial cells of the human cervix (HCerEpiC) to improve the image processing near the edges of microphotographs and reveal the topological invariance of the examined monolayers. Special contact microdomains may be present in epithelia of various natures, however, considering the well-known vertex model of epithelium, we show that such contacts are absent in the usual solid-like state of the model and appear only in the liquid-like cancer state. Also, we discuss a possible biological role of special contacts in context of proliferative epithelium dynamics and tissue morphogenesis.

Magnetothermopower of nodal line semimetals
Poulomi Chakraborty, Aaron Hui, Grigory Bednik, Brian Skinner
arXiv:2403.03084v1 Announce Type: new Abstract: The search for materials with large thermopower is of great practical interest. Dirac and Weyl semimetals have recently proven to exhibit superior thermoelectric properties, particularly when subjected to a quantizing magnetic field. Here we consider whether a similar enhancement arises in nodal line semimetals, for which the conduction and valence band meet at a line or ring in momentum space. We compute the Seebeck and Nernst coefficients for arbitrary temperature and magnetic field and we find a wealth of different scaling regimes. Most strikingly, when a sufficiently strong magnetic field is applied along the direction of the nodal line, the large degeneracy of states leads to a large, linear-in-$B$ thermopower that is temperature-independent even at low temperatures. Our results suggest that nodal line semimetals may offer significant opportunity for efficient, low-temperature thermoelectrics.

Suppressed localization effects in topological insulator -- antiferromagnetic insulator thin film bilayers of (BiSb)$_2$Te$_3$-MnF$_2$
Ryan Van Haren, David Lederman
arXiv:2403.03116v1 Announce Type: new Abstract: Thin films of co-doped (BiSb)$_2$Te$_3$ (0001) are grown via molecular beam epitaxy on substrates of Al$_2$O$_3$ (0001), MgF$_2$ (110) and a thin film of the antiferromagnetic insulator MnF$_2$ (110). Magnetoconductivity measurements of these (BiSb)$_2$Te$_3$ films show weak antilocalization at low temperature that is suppressed in (BiSb)$_2$Te$_3$ films grown on a MnF$_2$ layer, an effect attributed either to enhanced magnetic scattering at the interface or a proximity induced energy gap at the Dirac point. The (BiSb)$_2$Te$_3$ films are fit to a model describing the magnetoconductivity corrections in the 2D Dirac surface state of the topological insulator, from which the approximate value of the Fermi velocity near the Dirac point is derived. The (BiSb)$_2$Te$_3$ - MnF$_2$ bilayer samples are fit to a model describing the crossover from weak antilocalization to weak localization due to magnetic doping, suggesting the opening of an energy gap at the Dirac point in the (BiSb)$_2$Te$_3$ due to proximity with the antiferromagnetic MnF$_2$.

Particle-hole asymmetric phases in doped twisted bilayer graphene
Run Hou, Shouvik Sur, Lucas K. Wagner, Andriy H. Nevidomskyy
arXiv:2403.03123v1 Announce Type: new Abstract: Despite much theoretical work, developing a comprehensive ab initio model for twisted bilayer graphene (TBG) has proven challenging due to the inherent trade-off between accurately describing the band structure and incorporating the interactions within the Hamiltonian, particularly given the topological obstruction -- so-called fragile topology -- to the description of the model in terms of localized symmetric Wannier functions within the flat band manifold. Here, we circumvent this obstruction by using an extended 8-orbital model, for which localized Wannier orbitals have been formulated by Carr et al. [1]. We constructed an extended multi-orbital Hubbard model, and performed Hartree-Fock (HF) calculations to explore its phase diagram across commensurate fillings from -3 to 3. We found several nearly-degenerate insulating states at charge neutrality, all of which exhibit orbital orders. Crucially, TBG near magic angle is known to be particle-hole asymmetric, which is naturally captured by the single-particle band structure of our model and is reflected in the distinction between the symmetry broken states obtained at electron and hole dopings away from the charge neutral point. At filling -1 and +2, quantum anomalous hall states are obtained, while for the rest of the integer fillings away from charge neutrality, we found the system to realize metallic states with various orbital, valley and spin orderings. We also observed that most of the Hartree--Fock ground states exhibit a generalized valley Hund's-like rule, resulting in valley polarization. Importantly, we show that the incorporation of the intra-valley and inter-valley exchange interactions is crucial to properly stabilize the ordered symmetry-broken states. In agreement with experiments, we find significant particle-hole asymmetry, which underscores the importance of using particle-hole asymmetric models.

Nematic Ising superconductivity in twisted bilayer graphene under hydrostatic pressure
Miguel S\'anchez S\'anchez, Israel D\'iaz, Jos\'e Gonz\'alez, Tobias Stauber
arXiv:2403.03140v1 Announce Type: new Abstract: High hydrostatic pressures can be used to induce flat bands in twisted bilayer graphene, at twist angles larger than those realizing the usual magic-angle condition. Here, we characterize the emerging spin-degenerate correlated insulator phases for a (magic) twist angle of $\theta=3.5^\circ$ at even integer filling factors $\nu=0,\pm2$ by relying on an exact self-consistent real-space Hartree-Fock approach that accounts for the screened long-range Coulomb interaction $\epsilon$ as well as the on-site Hubbard interaction $U$. We further present a novel algorithm that maps the full real-space density matrix to a reduced density matrix based on a $SU(4)$ symmetry of sublattice and valley degree of freedom. At charge-neutrality, we obtain a pure state of a Kramers intervalley coherent insulator localized on the moir\'e unit cell with a trivial gap. For $\nu=\pm2$, we obtain a mixed state, either valley polarized or valley coherent with Chern number $|C|=1$ pero spin-channel. In the weak coupling limit $\epsilon=54$ and $U=4$eV, this leads to nematic Ising superconductivity for $\nu=-2.4$ and conventional triplet superconductivity for $\nu=2.3$, that can experimentally be tested.

Four-band effective square lattice model for Bernal-stacked bilayer graphene
Szu-Chao Chen, Alina Mre\'nca-Kolasi\'nska, Ming-Hao Liu
arXiv:2403.03155v1 Announce Type: new Abstract: Bernal-stacked bilayer graphene (BLG) provides an ideal basis for gate-controlled, and free of etching, electronic devices. Theoretical modeling of realistic devices is an essential part of research, however, simulations of large-scale BLG devices continue to be extremely challenging. Micrometer-sized systems are predominantly beyond the reach of the commonly used atomistic tight-binding method, while other numerical approaches based on the two dimensional Dirac equation are not straightforward to conduct due to the fermion doubling problem. Here we present an approach based on the continuum model, unharmed by the fermion doubling. The discretization of the BLG continuum Hamiltonian leads to an effective four-band model, with both valleys built-in. We demonstrate its performance with realistic, large-scale systems, and obtain results consistent with experiments and with the tight-binding model, over a broad range of magnetic field.

Dynamical decoding of the competition between charge density waves in a kagome superconductor
Honglie Ning, Kyoung Hun Oh, Yifan Su, Alexander von Hoegen, Zach Porter, Andrea Capa Salinas, Quynh L Nguyen, Matthieu Chollet, Takahiro Sato, Vincent Esposito, Matthias C Hoffmann, Adam White, Cynthia Melendrez, Diling Zhu, Stephen D Wilson, Nuh Gedik
arXiv:2403.03169v1 Announce Type: new Abstract: The kagome superconductor CsV$_3$Sb$_5$ hosts a variety of charge density wave (CDW) phases, which play a fundamental role in the formation of other exotic electronic instabilities. However, identifying the precise structure of these CDW phases and their intricate relationships remain the subject of intense debate, due to the lack of static probes that can distinguish the CDW phases with identical spatial periodicity. Here, we unveil the competition between two coexisting $2\times2\times2$ CDWs in CsV$_3$Sb$_5$ harnessing time-resolved X-ray diffraction. By analyzing the light-induced changes in the intensity of CDW superlattice peaks, we demonstrate the presence of both phases, each displaying a significantly different amount of melting upon excitation. The anomalous light-induced sharpening of peak width further shows that the phase that is more resistant to photo-excitation exhibits an increase in domain size at the expense of the other, thereby showcasing a hallmark of phase competition. Our results not only shed light on the interplay between the multiple CDW phases in CsV$_3$Sb$_5$, but also establish a non-equilibrium framework for comprehending complex phase relationships that are challenging to disentangle using static techniques.

Site Symmetry and Multiorbital Flat Bands on Kagome and Pyrochlore Lattices
Keyu Zeng, Ziqiang Wang
arXiv:2403.03201v1 Announce Type: new Abstract: Flat bands in electronic band structures are intriguing platforms for strong correlation and topological physics, primarily due to the suppressed kinetic energy of electrons. Various methods have been developed to create flat bands, utilizing lattice geometry or finely tuned parameters. Despite this, the investigation of orbital symmetry in multiorbital materials is a relatively new area of focus. In this work, we propose a site symmetry based systematic approach to emerging multiorbital flat bands in lattices made of corner-connecting motifs such as the kagome and pyrochlore lattices. As a conceptual advance, the one-orbital flat bands are shown to originate as mutual eigenstates of isolated molecular motifs. Further developing the mutual eigenstate method for multiorbitals transforming differently under the site symmetries such as mirror and inversion, we derive multiorbital flat bands from the skew-symmetric interorbital Hamiltonian and introduce an isolated molecule enabled group-theoretic description of the flat band wavefunctions. Realizations of the multiorbital flatbands in relevant materials are shown to be possible under the Slater-Koster formalism. Our findings provide new directions for exploring flatband electronic structures for novel correlated and topological quantum states.

Fermionic Fixed-Point Structure of Asymptotically Safe QED with a Pauli Term
Holger Gies, Kevin K. K. Tam
arXiv:2403.02980v1 Announce Type: cross Abstract: We test the physical viability of a recent proposal for an asymptotically safe modification of quantum electrodynamics (QED), whose ultraviolet physics is dominated by a non-perturbative Pauli spin-field coupling. We focus in particular on its compatibility with the absence of dynamical generation of fermion mass in QED. Studying the renormalization group flow of chiral four-fermion operators and their fixed points, we discover a distinct class of behavior compared to the standard picture of fixed-point annihilation at large gauge couplings and the ensuing formation of chiral condensates. Instead, transcritical bifurcations, where the fixed points merely exchange infrared stability, are observed. Provided that non-chiral operators remain irrelevant, our theory accommodates a universality class of light fermions for $N_{\text{f}} > 1$ irreducible Dirac flavors. On the contrary, in the special case of $N_{\text{f}} = 1$ flavor, this comes only at the expense of introducing one additional relevant parameter.

Quantum 2D Liouville Path-Integral Is a Sum over Geometries in AdS$_3$ Einstein Gravity
Lin Chen, Ling-Yan Hung, Yikun Jiang, Bing-Xin Lao
arXiv:2403.03179v1 Announce Type: cross Abstract: There is a renowned solution of the modular bootstrap that defines the UV complete quantum Liouville theory. We triangulate the path-integral of this Liouville CFT on any 2D surface $\mathcal{M}$, by proposing a shrinkable boundary condition for this special CFT that allows small holes to close, analogous to the proposal in rational CFTs [1-3]. This is essentially a tensor network that admits an interpretation of a state-sum of a 3D topological theory constructed with quantum 6j symbols of $\mathcal{U}_q(SL(2,\mathbb{R}))$ with non-trivial boundary conditions, and it reduces to a sum over 3D geometries weighted by the Einstein-Hilbert action to leading order in large $c$. The boundary conditions of quantum Liouville theory specifies a very special sum over bulk geometries to faithfully reproduce the CFT path-integral. The triangulation coincides with producing a network of geodesics in the AdS bulk, which can be changed making use of the pentagon identity and orthogonality condition satisfied by the 6j symbols, and arranged into a precise holographic tensor network.

On the computation of lattice sums without translational invariance
Andreas A. Buchheit, Torsten Ke{\ss}ler, Kirill Serkh
arXiv:2403.03213v1 Announce Type: cross Abstract: This work introduces a framework for the efficient computation of oscillatory multidimensional lattice sums in geometries with boundaries, a problem intersecting pure and applied mathematics with immediate applications in condensed matter physics and topological quantum physics. The challenge in evaluating the arising sums results from the combination of singular long-range interactions with the loss of translational invariance caused by the boundaries, rendering standard tools ineffective. Our work shows that these lattice sums can be generated from a generalization of the Riemann zeta function to multidimensional non-periodic lattice sums. We put forth a new representation of this zeta function together with a numerical algorithm that ensures super-exponential convergence across an extensive range of geometries. Notably, our method's runtime is influenced only by the complexity of the considered geometries and not by the sheer number of particles, providing the foundation for efficient simulations of macroscopic condensed matter systems. We showcase the practical utility of our method by computing interaction energies in a three-dimensional crystal structure with $3\times 10^{23}$ particles. Our method's accuracy is thoroughly assessed through a detailed error analysis that both uses analytical results and numerical experiments. A reference implementation is provided online along with the article

Impact of strain on the SOT-driven dynamics of thin film Mn$_3$Sn
Ankit Shukla, Siyuan Qian, Shaloo Rakheja
arXiv:2309.10246v2 Announce Type: replace Abstract: Mn$_3$Sn, a metallic antiferromagnet with an anti-chiral 120$^\circ$ spin structure, generates intriguing magneto-transport signatures such as a large anomalous Hall effect, spin-polarized current with novel symmetries, anomalous Nernst effect, and magneto-optic Kerr effect. When grown epitaxially as MgO(110)[001]$\parallel$ Mn$_3$Sn($0\bar{1}\bar{1}0$)[0001], Mn$_3$Sn experiences a uniaxial tensile strain, which changes the bulk six-fold anisotropy landscape to a perpendicular magnetic anisotropy with two stable states. In this work, we investigate the field-assisted spin orbit-torque (SOT)-driven response of the order parameter in single-domain Mn$_3$Sn with uniaxial tensile strain. We find that for a non-zero external magnetic field, the order parameter can be switched between the two stable states if the magnitude of the input current is between two field-dependent critical currents. Below the lower critical current, the order parameter exhibits a stationary state in the vicinity of the initial stable state. On the other hand, above the higher critical current, the order parameter shows oscillatory dynamics which could be tuned from the 100's of megahertz to the gigahertz range. We obtain approximate expressions of the two critical currents and find them to agree very well with the numerical simulations for experimentally relevant magnetic fields. We also obtain unified functional form of the switching time versus the input current for different magnetic fields. Finally, we show that for lower values of Gilbert damping ($\alpha \leq 2\times 10^{-3}$), the critical currents and the final steady states depend significantly on the damping constant. The numerical and analytic results presented in our work can be used by both theorists and experimentalists to understand the SOT-driven order dynamics in PMA Mn$_3$Sn and design future experiments and devices.

Collective motion in a sheet of microswimmers
D\'ora B\'ardfalvy, Viktor \v{S}kult\'ety, Cesare Nardini, Alexander Morozov, Joakim Stenhammar
arXiv:2310.05554v2 Announce Type: replace Abstract: Self-propelled micron-size particles suspended in a fluid, like bacteria or synthetic microswimmers, are strongly non-equilibrium systems where particle motility breaks the microscopic detailed balance, often resulting in large-scale collective motion. Previous theoretical work has identified long-range hydrodynamic interactions as the main driver of collective motion in unbounded dilute suspension of rear-actuated ("pusher") microswimmers. In contrast, most experimental studies of collective motion in microswimmer suspensions have been carried out in quasi-2-dimensional geometries such as in thin films or near solid or fluid interfaces, where both the swimmers' motion and their long-range flow fields become altered due to the proximity of a boundary. Here, we study numerically a minimal model of microswimmers in such a restricted geometry, where the particles move in the midplane between two no-slip walls. For pushers, we demonstrate collective motion with only short-ranged order, in contrast with the long-ranged flows observed in unbounded systems. For front-actuated ("puller") microswimmers, we discover a long-wavelength density instability resulting in the formation of dense microswimmer clusters. Both types of collective motion are fundamentally different from their previously studied counterparts in unbounded domains. Our results illustrate that hydrodynamic screening due to the presence of a wall is subdominant in determining the collective state of the suspension, which is instead dictated by the geometrical restriction of the swimmers' motion.

Andreev bound states in superconductor-barrier-superconductor junctions of Rarita-Schwinger-Weyl semimetals
Ipsita Mandal
arXiv:2312.16164v2 Announce Type: replace Abstract: We consider a superconductor-barrier-superconductor configuration built with Rarita-Schwinger-Weyl semimetal, which features four bands crossing at a single nodal point. Assuming a homogeneous s-wave pairing in each superconducting region, and the barrier region created by applying a voltage of magnitude $V_0 $ across a piece of normal state semimetal, we apply the BdG formalism to compute the discrete energy spectrum $\varepsilon $ of the subgap Andreev bound states in the short-barrier regime. In contrast with the two-band semimetals studied earlier, we find upto four pairs of localized states (rather than one pair for two-band semimetals) in the thin-barrier limit, and each value of $\varepsilon $ has a complicated dependence on the phase difference $\varphi_{12} $ via cosine and sine functions, which cannot be determined analytically. These are artifacts of multi-band nodes hosting quasiparticles of pseudospin values greater than $1/2$. Using the bound state energies, we compute the Josephson current across the junction configuration.

Doped Mott phase and charge correlations in monolayer 1T-NbSe$_2$
Xin Huang, Jose L. Lado, Jani Sainio, Peter Liljeroth, Somesh Chandra Ganguli
arXiv:2401.08296v2 Announce Type: replace Abstract: The doped Hubbard model is one of the paradigmatic platforms to engineer exotic quantum many-body states, including charge-ordered states, strange metals and unconventional superconductors. While undoped and doped correlated phases have been experimentally realized in a variety twisted van der Waals materials, experiments in monolayer materials, and in particular 1T transition metal dichalcogenides, have solely reached the conventional insulating undoped regime. Correlated phases in monolayer two-dimensional materials have much higher associated energy scales than their twisted counterparts, making doped correlated monolayers an attractive platform for high temperature correlated quantum matter. Here, we demonstrate the realization of a doped Mott phase in a van der Waals dichalcogenide 1T-NbSe$_2$ monolayer. The system is electron doped due to electron transfer to a monolayer van der Waals substrate via proximity, leading to a correlated triangular lattice with both half-filled and fully-filled sites. We analyze the distribution of the half-filled and filled sites and show the arrangement is unlikely to be controlled by disorder alone, and we show that the presence of competing non-local many-body correlations would account for the charge correlations found experimentally. Our results establish 1T-NbSe$_2$ as a potential monolayer platform to explore correlated doped Mott physics in a frustrated lattice.

Chiral Spin Liquid on a Shastry-Sutherland Heisenberg Antiferromagnet
Jian-Wei Yang, Wei-Wei Luo, W. Zhu, L. Wang, Bo Yang, Pinaki Sengupta
arXiv:2403.00597v2 Announce Type: replace Abstract: We demonstrate the existence of a topological chiral spin liquid in the frustrated Shastry-Sutherland Heisenberg model with an additional spin chirality interaction, using numerically unbiased exact diagonalization and density matrix renormalization group methods. We establish a quantum phase diagram where conventional phases, including dimer singlet, plaquette singlet, N{\' e}el and collinear phase, can be clearly identified by suitable local order parameters. Among them a $SU(2)_1$ chiral spin liquid emerges in the highly frustrated region, which is unambiguously identified by two topologically degenerate ground states, modular matrix, and characteristic level counting in entanglement spectrum, featuring the same topological order of $\nu=1/2$ bosonic Laughlin state. The phase boundaries among the different orders are determined by the energy level crossing analysis and wave function fidelity susceptibility.

Half-Metallic Ferromagnetic Weyl Fermions Related to Dynamic Correlations in the Zinc-blende Compound VAs
Xianyong Ding, Xin Jin, Haoran Wei, Ruixiang Zhu, Xiaoliang Xiao, Xiaozhi Wu, Fangyang Zhan, Rui Wang
arXiv:2403.02157v2 Announce Type: replace Abstract: The realization of 100\% polarized topological Weyl fermions in half-metallic ferromagnets is of particular importance for fundamental research and spintronic applications. Here, we theoretically investigate the electronic and topological properties of the zinc-blende compound VAs, which was deemed as a half-metallic ferromagnet related to dynamic correlations. Based on the combination of density functional theory and dynamical mean field theory, we uncover that the half-metallic ferromagnet VAs exhibit attractive Weyl semimetallic behaviors with twelve pairs of Weyl points, which are very close to the Fermi level. Meanwhile, we also investigate the magnetization-dependent topological properties; the results show that the change of magnetization directions only slightly affects the positions of Weyl points, which is attributed to the weak spin-orbital coupling effects. The topological surface states of VAs projected on semi-infinite (001) and (111) surfaces are investigated. The Fermi arcs of all Weyl points are clearly visible on the projected Fermi surfaces. Our findings suggest that VAs is a fully spin-polarized Weyl semimetal with many-body correlated effects for spintronic applications.

Majorana fermions in Kitaev chains side-coupled to normal metals
Abhiram Soori
arXiv:2403.02266v2 Announce Type: replace Abstract: Majorana fermions, exotic particles with potential applications in quantum computing, have garnered significant interest in condensed matter physics. The Kitaev model serves as a fundamental framework for investigating the emergence of Majorana fermions in one-dimensional systems. We explore the intriguing question of whether Majorana fermions can arise in a NM side-coupled to a Kitaev chain (KC) in the topologically trivial phase. Our findings reveal affirmative evidence, further demonstrating that the KC, when in the topological phase, can induce additional Majorana fermions in the neighboring NM region. Through extensive parameter analysis, we uncover the potential for zero, one, or two pairs of Majorana fermions in a KC side-coupled to an NM. Additionally, we investigate the impact of magnetic flux on the system and calculate the winding number -- a topological invariant -- to characterize the phase transitions.

Quantum teleportation implies symmetry-protected topological order
Yifan Hong, David T. Stephen, Aaron J. Friedman
arXiv:2310.12227v2 Announce Type: replace-cross Abstract: We constrain a broad class of teleportation protocols using insights from locality. In the "standard" teleportation protocols we consider, all outcome-dependent unitaries are Pauli operators conditioned on linear functions of the measurement outcomes. We find that all such protocols involve preparing a "resource state" exhibiting symmetry-protected topological (SPT) order with Abelian protecting symmetry $\mathcal{G}_{k}= (\mathbb{Z}_2 \times \mathbb{Z}_2)^k$. The $k$ logical states are teleported between the edges of the chain by measuring the corresponding $2k$ string order parameters in the bulk and applying outcome-dependent Paulis. Hence, this single class of nontrivial SPT states is both necessary and sufficient for the standard teleportation of $k$ qubits. We illustrate this result with several examples, including the cluster state, variants thereof, and a nonstabilizer hypergraph state.

Full-magnetic implementation of a classical Toffoli gate
Davide Nuzzi, Leonardo Banchi, Ruggero Vaia, Enrico Compagno, Alessandro Cuccoli, Paola Verrucchi, Sougato Bose
arXiv:2310.17422v3 Announce Type: replace-cross Abstract: The Toffoli gate is the essential ingredient for reversible computing, an energy efficient classical computational paradigm that evades the energy dissipation resulting from Landauer's principle. In this paper we analyze different setups to realize a magnetic implementation of the Toffoli gate using three interacting classical spins, each one embodying one of the three bits needed for the Toffoli gate. In our scheme, different control-spins configurations produce an effective field capable of conditionally flipping the target spin. We study what are the experimental requirements for the realization of our scheme, focusing on the degree of local control, the ability to dynamically switch the spin-spin interactions, and the required single-spin anisotropies to make the classical spin stable, showing that these are compatible with current technology.

Found 4 papers in prb
Date of feed: Wed, 06 Mar 2024 04:17:09 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)

Pulse-width dependent critical current density and the depinning probability of a magnetic skyrmion by spin-polarized currents
Xin Xie, Lingyao Kong, Weiwei Wang, Dongsheng Song, and Haifeng Du
Author(s): Xin Xie, Lingyao Kong, Weiwei Wang, Dongsheng Song, and Haifeng Du

Magnetic skyrmions are topological spin textures with potential applications in future spintronic devices. Spin-polarized current is an effective way to manipulate magnetic skyrmions. Recent experiments show that the critical current density to move the skyrmion decays gradually with the pulse width…


[Phys. Rev. B 109, 104405] Published Tue Mar 05, 2024

Bulk superconductivity in quasi-one-dimensional $\mathrm{ZrS}{\mathrm{e}}_{3}$ under high pressure
Yiping Gao, Can Tian, Xiaoli Huang, Xin Wang, and Tian Cui
Author(s): Yiping Gao, Can Tian, Xiaoli Huang, Xin Wang, and Tian Cui

A wide range of two-dimensional (2D) materials have exhibited anomalous electrical properties when surrendered to pressure, along with the unsolved long-standing mystery of the relationship between dimension and superconductivity (SC). Investigation of group IVB transition-metal trichalcogenides (TM…


[Phys. Rev. B 109, 104501] Published Tue Mar 05, 2024

Invariant points amidst gauge sensitivity in cylindrical and toroidal lattices
Caelan Brooks and Kunal K. Das
Author(s): Caelan Brooks and Kunal K. Das

We examine the spectrum for lattices with cylindrical and toroidal topology subject to Abelian gauge potentials. Gauges that are equivalent in planar lattices with trivial topology develop differences due to the periodic boundary conditions. But some residual gauge equivalency, evident in the spectr…


[Phys. Rev. B 109, 115404] Published Tue Mar 05, 2024

Compound-tunable embedding potential method to model local electronic excitations on $f$-element ions in solids: Pilot relativistic coupled cluster study of Ce and Th impurities in yttrium orthophosphate, ${\mathrm{YPO}}_{4}$
A. V. Oleynichenko, Y. V. Lomachuk, D. A. Maltsev, N. S. Mosyagin, V. M. Shakhova, A. Zaitsevskii, and A. V. Titov
Author(s): A. V. Oleynichenko, Y. V. Lomachuk, D. A. Maltsev, N. S. Mosyagin, V. M. Shakhova, A. Zaitsevskii, and A. V. Titov

A method to simulate local properties and processes in crystals with impurities via constructing cluster models within the frame of the compound-tunable embedding potential (CTEP) and highly accurate ab initio relativistic molecular-type electronic structure calculations is developed and applied to …


[Phys. Rev. B 109, 125106] Published Tue Mar 05, 2024

Found 1 papers in pr_res
Date of feed: Wed, 06 Mar 2024 04:17:07 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)

Chiral Meissner state in time-reversal invariant Weyl superconductors
Vira Shyta, Jeroen van den Brink, and Flavio S. Nogueira
Author(s): Vira Shyta, Jeroen van den Brink, and Flavio S. Nogueira

Weyl semimetals have nodes in their electronic structure at which electrons attain a definite chirality. Due to the chiral anomaly, the nonconservation of charges with given chirality, the axion term appears in their effective electromagnetic action. We determine how this affects the properties of t…


[Phys. Rev. Research 6, 013240] Published Tue Mar 05, 2024

Found 10 papers in nano-lett
Date of feed: Tue, 05 Mar 2024 14:09:21 GMT

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

[ASAP] Nonlocal, Flat-Band Meta-Optics for Monolithic, High-Efficiency, Compact Photodetectors
Minho Choi, Christopher Munley, Johannes E. Fröch, Rui Chen, and Arka Majumdar

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c05139

[ASAP] Designer Spin Models in Tunable Two-Dimensional Nanographene Lattices
João Henriques, Mar Ferri-Cortés, and Joaquín Fernández-Rossier

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04915

[ASAP] Emergence of Improper Electronic Ferroelectricity and Flat Band in Twisted Bilayer Tl2S
Zhigang Gui, Wei Li, and Li Huang

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Nano Letters
DOI: 10.1021/acs.nanolett.4c00141

[ASAP] Balancing the Ion/Electron Transport of Graphite Anodes by a La-Doped TiNb2O7 Functional Coating for Fast-Charging Li-Ion Batteries
Yeliang Sheng, Xinyang Yue, Wei Hao, Yongteng Dong, Yakun Liu, and Zheng Liang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c05151

[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

[ASAP] Quantification of Hybrid Topological Spin Textures and Their Nanoscale Fluctuations in Ferrimagnets
Yuxuan Zhang, Teng Xu, Wanjun Jiang, Rong Yu, and Zhen Chen

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04409

[ASAP] Direct Hot-Electron Transfer at the Au Nanoparticle/Monolayer Transition-Metal Dichalcogenide Interface Observed with Ultrahigh Spatiotemporal Resolution
Jinglin Tang, Yaolong Li, Sheng Ye, Pengzuo Jiang, Zhaohang Xue, Xiaofang Li, Xiaying Lyu, Qinyun Liu, Saisai Chu, Hong Yang, Chengyin Wu, Xiaoyong Hu, Yunan Gao, Shufeng Wang, Quan Sun, Guowei Lu, and Qihuang Gong

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Nano Letters
DOI: 10.1021/acs.nanolett.4c00324

[ASAP] Nonlinear Landau Fan Diagram for Graphene Electrons Exposed to a Moiré Potential
Pilkyung Moon, Youngwook Kim, Mikito Koshino, Takashi Taniguchi, Kenji Watanabe, and Jurgen H. Smet

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04444

[ASAP] Ultralow Auger-Assisted Interlayer Exciton Annihilation in WS2/WSe2 Moiré Heterobilayers
Cheng-Syuan Cai, Wei-Yan Lai, Po-Hsuan Liu, Tzu-Chieh Chou, Ro-Ya Liu, Chih-Ming Lin, Shangjr Gwo, and Wei-Ting Hsu

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Nano Letters
DOI: 10.1021/acs.nanolett.3c04688

[ASAP] Topological Nodal-Point Superconductivity in Two-Dimensional Ferroelectric Hybrid Perovskites
Xiaoyin Li, Shunhong Zhang, Xiaoming Zhang, Zeev Valy Vardeny, and Feng Liu

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c04085

Found 3 papers in acs-nano
Date of feed: Tue, 05 Mar 2024 14:04:53 GMT

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

[ASAP] Correlation-Induced Symmetry-Broken States in Large-Angle Twisted Bilayer Graphene on MoS2
Kaihui Li, Long-Jing Yin, Chenglong Che, Shihao Zhang, Xueying Liu, Yulong Xiao, Songlong Liu, Qingjun Tong, Si-Yu Li, and Anlian Pan

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c09993

[ASAP] Niobium Boride/Graphene Directing High-Performance Lithium–Sulfur Batteries Derived from Favorable Surface Passivation
Yanjuan Li, Zhanzhan Wang, HongFei Gu, Hongpeng Jia, Zhouyang Long, and Xiao Yan

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c12076

[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

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c09222

Found 1 papers in small
Date of feed: Tue, 05 Mar 2024 08:24:58 GMT

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

Biomimetic Mineralization Synthesis of Flower‐Like Cobalt Selenide/Reduced Graphene Oxide for Improved Electrochemical Deionization
Min Fu, Hao Yu, Ruitao Lv, Kunhua Wang, Meng Gao, Liangmin Ning, Wei Chen, Jianming Pan, Huan Pang
Small, EarlyView.

Found 1 papers in adv-mater
Date of feed: Tue, 05 Mar 2024 08:19:03 GMT

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Topological Spin Textures in an Insulating van der Waals Ferromagnet
Sergey Grebenchuk, Conor McKeever, Magdalena Grzeszczyk, Zhaolong Chen, Makars Šiškins, Arthur R. C. McCray, Yue Li, Amanda K. Petford‐Long, Charudatta M. Phatak, Duan Ruihuan, Liu Zheng, Kostya S. Novoselov, Elton J. G. Santos, Maciej Koperski
Advanced Materials, EarlyView.