Found 30 papers in cond-mat
Date of feed: Wed, 18 Oct 2023 00:30:00 GMT

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$W$ state is not the unique ground state of any local Hamiltonian. (arXiv:2310.10716v1 [cond-mat.str-el])
Lei Gioia, Ryan Thorngren

The characterization of ground states among all quantum states is an important problem in quantum many-body physics. For example, the celebrated entanglement area law for gapped Hamiltonians has allowed for efficient simulation of 1d and some 2d quantum systems using matrix product states. Among ground states, some types, such as cat states (like the GHZ state) or topologically ordered states, can only appear alongside their degenerate partners, as is understood from the theory of spontaneous symmetry breaking. In this work, we introduce a new class of simple states, including the $W$ state, that can only occur as a ground state alongside an exactly degenerate partner, even in gapless or disordered models. We show that these states are never an element of a stable gapped ground state manifold, which may provide a new method to discard a wide range of 'unstable' entanglement area law states in the numerical search of gapped phases. On the other hand when these degenerate states are the ground states of gapless systems they possess an excitation spectrum with $O(1/L^2)$ finite-size splitting. One familiar situation where this special kind of gaplessness occurs is at a Lifshitz transition due to a zero mode; a potential quantum state signature of such a critical point. We explore pathological parent Hamiltonians, and discuss generalizations to higher dimensions, other related states, and implications for understanding thermodynamic limits of many-body quantum systems.

Realizing Topological Superconductivity in Tunable Bose-Fermi Mixtures with Transition Metal Dichalcogenide Heterostructures. (arXiv:2310.10720v1 [cond-mat.mes-hall])
Caterina Zerba, Clemens Kuhlenkamp, Ataç Imamoğlu, Michael Knap

Heterostructures of two-dimensional transition metal dichalcogenides (TMDs) are emerging as a promising platform for investigating exotic correlated states of matter. Here, we propose to engineer Bose-Fermi mixtures in these systems by coupling inter-layer excitons to doped charges in a trilayer structure. Their interactions are determined by the inter-layer trion, whose spin-selective nature allows excitons to mediate an attractive interaction between charge carriers of only one spin species. Remarkably, we find that this causes the system to become unstable to topological p+ip superconductivity at low temperatures. We then demonstrate a general mechanism to develop and control this unconventional state by tuning the trion binding energy using a solid-state Feshbach resonance.

Uniting Weyl semimetals and semiconductors in a family of arsenides. (arXiv:2310.10741v1 [cond-mat.mtrl-sci])
Pacuski Wojciech

In this preview, we discuss how to combine concepts of Weyl fermions, amazing electronic properties of bulk Weyl semimetals, and advances in molecular beam epitaxy with the needs of semiconductor industry, through the fabrication of TaAs thin films.

Quarter-Metal Phases in Multilayer Graphene: Ising-XY and Annular Lifshitz Transitions. (arXiv:2310.10759v1 [cond-mat.mes-hall])
Mainak Das, Chunli Huang

Recent experiments have uncovered a distinctive magnetic metal in lightly-doped multilayer graphene, coined the \textit{quarter metal}. This quarter metal consolidates all the doped carriers, originally distributed evenly across the four (or twelve) Fermi surfaces of the paramagnetic state, into one expansive Fermi surface by breaking time-reversal and/or inversion symmetry. In this work, we map out a comprehensive mean-field phase diagram of the quarter-metal in rhombohedral trilayer graphene within the four dimensional parameter space spanned by the density $n_e$, interlayer electric potential $U$, external magnetic field parallel to the two-dimensional material plane $B_{\parallel}$ and Kane-Mele spin-orbit coupling $\lambda$. We found an annular Lifshitz phase transition and a Ising-XY phase transition and locate these phase boundaries on the experimental phase diagram. The movement of the Ising-XY phase boundary offers insights into $\lambda$. Our analysis reveals that it moves along the line $\partial n_e/\partial B_{\parallel} \sim -0.5\times 10^{11} \text{cm}^{-2}\text{T}^{-1}$ within the $n_e$-$B_{\parallel}$ parameter space when $\lambda=30\mu$eV. Additionally, we estimated the in-plane spin susceptibility of the valley-Ising quarter-metal $\chi_{_\parallel}\sim 8~\mu\text{eV} ~\text{T}^{-2}$. Beyond these quantitative findings, two general principles emerge from our study: 1) The valley-XY quarter metal's dominance in the $n_e-U$ parameter space grows with an increasing number of layers due to the reduce valley polarization variations within the Fermi sea. 2) Layer polarization near the band edge plays an important role in aiding the re-entrance of the paramagnetic state at low density. The insights derived from the quarter metal physics may shed light on the complex behaviors observed in other regions of the phase diagram.

Fragile topological dislocation modes. (arXiv:2310.10779v1 [cond-mat.mes-hall])
Gabriel Malavé, Jorge Schifferli, Rodrigo Soto-Garrido, Pedro A. Orellana, Vladimir Juričić

We here introduce the concept of fragile topological dislocation modes, which are localized only in a fraction of a topological phase, while otherwise leak into the bulk continuum. We show that such dislocation modes are hosted in an obstructed atomic topological phase in the two-dimensional Su-Schrieffer-Heeger model, but only in a finite region with an indirect gap at high energy. These dislocation modes are realized as chiral pairs at finite energies with protection stemming from a combination of the chiral (unitary particle-hole) and the point group (C$_{4v}$) symmetries, but only when the indirect gap is open. In this regime, we corroborate the stability of the defect modes by following their localization and also by explicitly adding a weak chemical potential disorder. Our findings, therefore, should be consequential for the experimental observation of such modes in designer topological crystals and classical metamaterials.

Basal force fluctuations and granular rheology: Linking macroscopic descriptions of granular flows to bed forces with implications for monitoring signals. (arXiv:2310.10871v1 [cond-mat.soft])
P.J. Zrelak, Eric C. P. Breard, Josef Dufek

Granular flows are ubiquitous in nature with single flows traversing a wide range of dynamic conditions from initiation to deposition. Basal forces exerted by environmental granular flows are responsible for the generation of observable seismic signals. To fully realize the benefit of seismic measurements, basal granular forces must be linked to macroscopic internal flow dynamics across a wide range of flow conditions. We utilize discrete element simulations to observe dry and submerged granular flows under plane-shear and inclined flow configurations, relating bulk kinematics and rheology to basal forcing signals. We find that regardless of the flow geometry/initiation the variance in basal forcing scales with a local non-dimensional shear-rate (or inertial number I), and this scaling tracks four different flow regimes spanned by our simulations: (1) an unsteady particle rearrangement regime when $I<10^{-3}$, where basal forces are dominated by low frequencies; (2) an intermediate regime when $10^{-3}< I<10^{-2}$, where granular temperature is isotropic and basal forces start to become noise-like, (3) a transitional regime at $10^{-2}<I<10^{-1}$, where the increase in basal tractions with increasing shear-rates stalls as the granular bed dilates, partially destroying the contact network and configurational memory, and (4) a fully collisional regime when $I>10^{-1}$, where granular temperature is anisotropic in the stream-wise direction, and the signal becomes white noise-like up to a cutoff frequency that is dependent on particle size and shear-rate. This effort suggests that basal forces, recorded in instrumented channels or inverted from seismic signals, can be used to interpret complex granular processes in geophysical flows.

Magnetic field driven Lifshitz transition and one-dimensional Weyl nodes in three-dimensional pentatellurides. (arXiv:2310.10906v1 [cond-mat.mes-hall])
Zhigang Cai, Yi-Xiang Wang

Recent experiments reported that the magnetic field can drive the Lifshitz transition and one-dimensional (1D) Weyl nodes in the quantum limit of three-dimensional pentatellurides, as they own low carrier densities and can achieve the extreme quantum limit at a low magnetic field. In this paper, we will investigate the conditions for the existence of the 1D Weyl nodes and their dc transport properties. We find that in the strong topological insulator (TI) phase of ZrTe5, the formation of the Weyl nodes depends heavily on the carrier density; while in the weak TI phase of HfTe5, the Weyl nodes are more likely to appear. These behaviors are attributed to the fact that in the strong and weak TI phases, the zeroth Landau levels exhibit opposite evolutions with the magnetic field. Moreover, the signatures of the critical fields that characterize the distinct behaviors of the system can be directly captured in the conductivities.

Defects Vibrations Engineering for Enhancing Interfacial Thermal Transport. (arXiv:2310.10945v1 [])
Yijie Zhou, Robert Ciarla, Artittaya Boonkird, Thanh Nguyen, Jiawei Zhou, Zhang Jiang, Xiaobing Zuo, Jeewan Ranasinghe, Weiguo Hu, Brendan Scott, Shengxi Huang, Mingda Li, Yanfei Xu

To push upper boundaries of effective thermal conductivity in polymer composites, a fundamental understanding of thermal transport mechanisms is crucial. Although there is intensive simulation research, systematic experimental investigation on thermal transport in polymer composites is limited. To better understand thermal transport processes, we design polymer composites with perfect fillers (graphite) and defective fillers (graphite oxide); we choose polar polyvinyl alcohol (PVA) as a matrix model; and we identify how thermal transport occurs across heterogeneous interfaces. Measured thermal conductivities of in PVA/defective filler composites is higher than those of PVA/perfect filler composites, while measured thermal conductivities in defective fillers are lower than those of perfect fillers. An effective quantum mechanical model is developed, showing that the vibrational state of the defective level plays a critical role in enhancing the thermal conductivity with increased defect concentration. Our experimental and model results have suggested that defects in polymer composites may enhance thermal transport in polymer composites by promoting vibrational resonant couplings.

A Non-Hermitian Moir\'{e} Valley Filter. (arXiv:2310.10973v1 [cond-mat.mes-hall])
Kai Shao, Hao Geng, Erfu Liu, Jose L. Lado, Wei Chen, D. Y. Xing

A valley filter capable of generating a valley-polarized current is a crucial element in valleytronics, yet its implementation remains challenging. Here, we propose a valley filter made of a graphene bilayer which exhibits a 1D moir\'{e} pattern in the overlapping region of the two layers controlled by heterostrain. In the presence of a lattice modulation between layers, electrons propagating in one layer can have valley-dependent dissipation due to valley asymmetric interlayer coupling, thus giving rise to a valley-polarized current. Such a process can be described by an effective non-Hermitian theory, in which the valley filter is driven by a valley-resolved non-Hermitian skin effect. Nearly 100\% valley-polarization can be achieved within a wide parameter range and the functionality of the valley filter is electrically tunable. The non-Hermitian topological scenario of the valley filter ensures high tolerance against imperfections such as disorder and edge defects. Our work opens a new route for efficient and robust valley filters while significantly relaxing the stringent implementation requirements.

Topological gap solitons in Rabi Su-Schrieffer-Heeger lattices. (arXiv:2310.11148v1 [nlin.PS])
Chunyan Li, Yaroslav V. Kartashov

In this work, using binary Bose-Einstein condensate we propose a new type of topological insulator that does not explicitly use specially designed potential landscape, but instead utilizes spatially inhomogeneous Rabi coupling between two components, in the form of one- or two-dimensional Su-Schrieffer-Heeger (SSH) structure, combined with Zeeman splitting. Such Rabi lattices reveal the appearance of topologically nontrivial phases (including higher-order ones) controlled by spatial shift of the domains with enhanced coupling between condensates within unit cells of the structure, where localized topological states appear at the edges or in the corners of truncated Rabi lattice. We also show that the properties of edge states, their spatial localization, and location of their chemical potential within topological gap can be controlled by interatomic interactions that lead to formation of gap topological edge solitons bifurcating from linear edge states. Such solitons in condensates with inhomogeneous Rabi coupling appear as very robust nonlinear topological objects that do not require any threshold norm for their formation even in two-dimensional geometries, and that can exist in stable form for both attractive and repulsive interactions. Our results demonstrate considerable enhancement of stability of solitons in topological Rabi lattices in comparison with trivial Rabi lattices. They open new prospects for realization of topologically nontrivial phases by spatial engineering of coupling in multicomponent systems.

Theory of pseudospin resonance for multiband superconductors. (arXiv:2310.11195v1 [cond-mat.supr-con])
Kristian Hauser Villegas

We formulate a generalized pseudospin formalism for multiband superconductors in the presence of an external perturbing electromagnetic field. Our theory naturally captures the effects of quantum band geometric quantities and is valid even for flat-band superconductors. As an interesting consequence of our theory, we show that there is an interband pairing fluctuations induced by the external field and mediated by the quantum band geometry. Surprisingly, this interband fluctuation is independent of the band gap, which can be understood from the geometric nature of such novel fluctuations. We derive the generalized equation of motion for the multiband pseudospin and the self-consistency equation. We present a formal solution to the pseudospin equation of motion in powers of the perturbing electromagnetic field. As a simple illustration of our theory, we calculate the Leggett modes for the two band case.

The 3-dimensional Fermi liquid description for the normal state of cuprate superconductors. (arXiv:2310.11236v1 [cond-mat.supr-con])
Setsuo Misawa

The quasiparticles in the normal state of cuprate superconductors have been shown to behave universally as a 3-dimensional Fermi liquid. Because of interactions and the presence of the Fermi surfaces (or Fermi energies), the quasiparticle energy contains, as a function of the momentum $\boldmath{p}$, a term of the form $(p-p_0)^3 \ln ( | p-p_0 | / p_0 )$, where $p = | \boldmath{p} |$ and $p_0$ is the Fermi momentum. The electronic specific heat coefficient $\gamma(T)$, electrical resistivity, Hall coefficient and thermoelectric power divided by temperature $T$, follow the logarithmic formula $a - b T^2 \ln ( T/T^*) $, $a$, $b$, and $T^*$ being constant. Singularities in the Landau $f$-function produce the $T^2 \ln T$ dependence of the magnetic susceptibility $\chi (T)$, and Knight shift, which gives rise to the phenomenon of the susceptibility maximum. The logarithmic $T$-dependence of the transport properties arises exclusively from the impurity scattering in 3-dimensional (3D) systems, but does not from the electron-electron scattering in 2D systems. The above logarithmic formula has been shown to explain universally the experimental data for the normal state of all cuprate superconductors. The decrease of $\gamma(T)$ or $\chi(T)$ with decreasing $T$ is not due to the appearance of pseudogap or spin gap but due to its $T^2 \ln T$ variation.

Coexistence of magnetic and topological phases in spin-1/2 anisotropic extended XY chain. (arXiv:2310.11243v1 [cond-mat.mes-hall])
Rakesh Kumar Malakar, Asim Kumar Ghosh

In this study, a spin-1/2 anisotropic extended XY chain has been introduced in which both time reversal and SU(2) symmetries are broken but $Z_2$ symmetry is preserved. System exhibits the faithful coexistence of magnetic and topological superconducting phases even in the presence of transverse magnetic field. Location of those phases in the parameter space has been determined precisely. Quantum phase transition is noted at zero magnetic field, as well as magnetic long range order is found to withstand magnetic field of any strength. Exact analytic results for spin-spin correlation functions have been obtained in terms of Jordan Wigner fermionization. Existence of long range magnetic order has been investigated numerically by finding correlation functions as well as the Binder cumulant in the ground state. Dispersion relation, ground state energy, and energy gap are obtained analytically. In order to find the topologically nontrivial phase, sign of Pfaffian invariant and value of winding number have been evaluated. Both magnetic and topological phases are robust against the magnetic field and found to move coercively in the parameter space with the variation of its strength. Long range orders along two orthogonal directions and two different topological phases are found and their one-to-one correspondence has been established. Finally casting the spinless fermions onto Majorana fermions, properties of zero energy edge states are studied. Three different kinds of Majorana pairings are noted. In the trivial phase, next-nearest-neighbor Majorana pairing is found, whereas two different types of nearest-neighbor Majorana pairings are identified in the topological superconducting phase.

Neural network approach for a rapid prediction of metal-supported borophene properties. (arXiv:2310.11245v1 [cond-mat.mtrl-sci])
Pierre Mignon, Abdul-Rahman Allouche, Neil Richard Innis, Colin Bousige

We develop a high-dimensional neural network potential (NNP) to describe the structural and energetic properties of borophene deposited on silver. This NNP has the accuracy of DFT calculations while achieving computational speedups of several orders of magnitude, allowing the study of extensive structures that may reveal intriguing moir\'e patterns or surface corrugations. We describe an efficient approach to constructing the training data set using an iterative technique known as the "adaptive learning approach". The developed NNP potential is able to produce, with an excellent agreement, the structure, energy and forces of DFT. Finally, the calculated stability of various borophene polymorphs, including those not initially included in the training dataset, shows better stabilization for $\nu\sim0.1$ hole density, and in particular for the allotrope $\alpha$ ($\nu=\frac{1}{9}$). The stability of borophene on the metal surface is shown to depend on its orientation, implying structural corrugation patterns that can only be observed from long time simulations on extended systems. The NNP also demonstrates its ability to simulate vibrational densities of states and produce realistic structures, with simulated STM images closely matching the experimental ones.

Size-dependence and high temperature stability of radial vortex magnetic textures imprinted by superconductor stray fields. (arXiv:2310.11298v1 [cond-mat.mtrl-sci])
D. Sanchez-Manzano, G. Orfila, A. Sander, L. Marcano, F. Gallego, M. A. Mawass, F. Grilli, A. Arora, A. Peralta, F.A. Cuellar, J.A. Fernandez-Roldan, N. Reyren, F. Kronast, C. Leon, A. Rivera-Calzada, J.E. Villegas, J. Santamaria, S. Valencia

Swirling spin textures, including topologically non-trivial states, such as skyrmions, chiral domain walls, and magnetic vortices, have garnered significant attention within the scientific community due to their appeal from both fundamental and applied points of view. However, their creation, controlled manipulation, and stability are typically constrained to certain systems with specific crystallographic symmetries, bulk, or interface interactions, and/or a precise stacking sequence of materials. Here, we make use of the stray field of YBa2Cu3O7-{\delta} superconducting microstructures in ferromagnet/superconductor hybrids to imprint magnetic radial vortices in permalloy at temperatures below the superconducting transition temperature (TC), a method easily extended to other ferromagnets with in-plane magnetic anisotropy. We examine the size dependence and temperature stability of the imprinted magnetic configurations. We show that above TC, magnetic domains retain memory of the imprinted spin texture. Micromagnetic modelling coupled with a SC field model reveals that the stabilization mechanism leading to this memory effect is mediated by microstructural defects. Superconducting control of swirling spin textures below and above the superconducting transition temperature holds promising prospects for shaping spintronics based on magnetic textures.

k-dependent proximity-induced modulation of spin-orbit interaction in MoSe2 interfaced with amorphous Pb. (arXiv:2310.11317v1 [cond-mat.mtrl-sci])
Fatima Alarab, Ján Minár, Procopios Constantinou, Dhani Nafday, Thorsten Schmitt, Xiaoqiang Wang, Vladimir N. Strocov

The ability to modulate the spin-orbit (SO) interaction is crucial for engineering a wide range of spintronics-based quantum devices, extending from state-of-the-art data storage to materials for quantum computing. The use of proximity-induced effects for this purpose may become the mainstream approach, whereas their experimental verification using angle-resolved photoelectron spectroscopy (ARPES) has so far been elusive. Here, using the advantages of soft-X-ray ARPES on its probing depth and intrinsic resolution in three-dimensional momentum k, we identify a distinct modulation of the SO interaction in a van der Waals semiconductor (MoSe2) proximitized to a high-Z metal (Pb), and measure its variation through the k-space. The strong SO field from Pb boosts the SO splitting by up to 30% at the H-point of the bulk Brillouin zone, the spin-orbit hotspot of MoSe2. Tunability of the splitting via the Pb thickness allows its tailoring to particular applications in emerging quantum devices.

Extremely large anomalous Hall conductivity and unusual axial diamagnetism in a quasi-1D Dirac material La$_3$MgBi$_5$. (arXiv:2310.11378v1 [cond-mat.mtrl-sci])
Zhe-Kai Yi, Peng-Jie Guo, Hui Liang, Yi-Ran Li, Ping Su, Na Li, Ying Zhou, Dan-Dan Wu, Yan Sun, Xiao-Yu Yue, Qiu-Ju Li, Shou-Guo Wang, Xue-Feng Sun, Yi-Yan Wang

Anomalous Hall effect (AHE), one of the most important electronic transport phenomena, generally appears in ferromagnetic materials but is rare in materials without magnetic elements. Here, we present a study of La$_3$MgBi$_5$, whose band structure carries multitype Dirac fermions. Although magnetic elements are absent in La$_3$MgBi$_5$, clear signals of AHE can be observed. In particular, the anomalous Hall conductivity is extremely large, reaching 42,356 $\Omega^{-1}$ cm$^{-1}$ with an anomalous Hall angle of 8.8 %, the largest one that has been observed in the current AHE systems. The AHE is suggested to originate from the combination of skew scattering and Berry curvature. Another unique property discovered in La$_3$MgBi$_5$ is the axial diamagnetism. The diamagnetism is significantly enhanced and dominates the magnetization in the axial directions, which is the result of restricted motion of the Dirac fermion at Fermi level. Our findings not only establish La$_3$MgBi$_5$ as a suitable platform to study AHE and quantum transport, but also indicate the great potential of 315-type Bi-based materials for exploring novel physical properties.

Theoretical investigation of delafossite-Cu2ZnSnO4 as a promising photovoltaic absorber. (arXiv:2310.11424v1 [cond-mat.mtrl-sci])
Seoung-Hun Kang, Myeongjun Kang, Sang Woon Hwang, Sinchul Yeom, Mina Yoon, Jong Mok Ok, Sangmoon Yoon

In the quest for efficient and cost-effective photovoltaic absorber materials beyond silicon, considerable attention has been directed toward exploring alternatives. One such material, zincblende-derived Cu2ZnSnS4 (CZTS), has shown promise due to its ideal band-gap size and high absorption coefficient. However, challenges such as structural defects and secondary phase formation have hindered its development. In this study, we examine the potential of another compound Cu2ZnSnO4 (CZTO) with a similar composition to CZTS as a promising alternative. Employing ab initio density function theory (DFT) calculations in combination with an evolutionary structure prediction algorithm, we identify that the crystalline phase of the delafossite structure is the most stable among the 900 (meta)stable CZTO. Its thermodynamic stability at room temperature is also confirmed by the molecular dynamics study. Excitingly, this new phase of CZTO displays a direct band gap where the dipole-allowed transition occurs, making it a strong candidate for efficient light absorption. Furthermore, the estimation of spectroscopic limited maximum efficiency (SLME) directly demonstrates the high potential of delafossite-CZTO as a photovoltaic absorber. Our numerical results suggest that delafossite-CZTO holds another promise for future photovoltaic applications.

Boundary-induced singularity in strongly-correlated quantum systems at finite temperature. (arXiv:2204.06817v3 [quant-ph] UPDATED)
Ding-Zu Wang, Guo-Feng Zhang, Maciej Lewenstein, Shi-Ju Ran

Exploring the bulk-boundary correspondences and the boundary-induced phenomena in the strongly-correlated quantum systems belongs to the most fundamental topics of condensed matter physics. In this work, we study the bulk-boundary competition in a simulative Hamiltonian, with which the thermodynamic properties of the infinite-size translationally-invariant system can be optimally mimicked. The simulative Hamiltonian is constructed by introducing local interactions on the boundaries, coined as the entanglement-bath Hamiltonian (EBH) that is analogous to the heat bath. The terms within the EBH are variationally determined by a thermal tensor network method, with coefficients varying with the temperature of the infinite-size system. By treating the temperature as an adjustable hyper-parameter of the EBH, we identify a discontinuity point of the coefficients, dubbed as the ``boundary quench point'' (BQP), whose physical implication is to distinguish the point, below which the thermal fluctuations from the boundaries to the bulk become insignificant. Fruitful phenomena are revealed when considering the simulative Hamiltonian, with the EBH featuring its own hyper-parameter, under the canonical ensembles at different temperatures. Specifically, a discontinuity in bulk entropy at the BQP is observed. The exotic entropic distribution, the relations between the symmetries of Hamiltonian and BQP, and the impacts from the entanglement-bath dimension are also explored. Our results show that such a singularity differs from those in the conventional thermodynamic phase transition points that normally fall into the Landau-Ginzburg paradigm. Our work provides the opportunities on exploring the exotic phenomena induced by the competition between the bulk and boundaries.

Anatomy of Spin and Current Generation from Magnetization Gradients in Topological Insulators and Rashba Metals. (arXiv:2210.07265v3 [cond-mat.mes-hall] UPDATED)
Panagiotis Kotetes, Hano O. M. Sura, Brian M. Andersen

We explore the spin density and charge currents arising on the surface of a topological insulator and in a 2D Rashba metal due to magnetization gradients. For topological insulators a single interconversion coefficient controls the generation of both quantities. This coefficient is quantized to a value proportional to the vorticity of the Dirac point which constitutes a hallmark of parity anomaly at finite density. As such, it also unveils a robust route to disentangle and detect the protected states of a topological insulator on a given surface. In stark contrast, Rashba metals do not exhibit such anomalies since they contain an even number of helical branches. Nonetheless, also these are governed by quantized responses which, however, are not protected against weak disorder. Furthermore, we find that for Rashba metals the interconversion coefficients demonstrate discontinuities and a nontrivial interplay upon varying the chemical potential, the strength of the spin-orbit coupling, and a pairing gap. Our results have implications for the binding between magnetic skyrmions and superconducting vortices, the emergence of Majorana zero modes, and pave the way for superconducting diode effects mediated by out-of-plane magnetization gradients.

Asymmetric bistability of chiral particle orientation in viscous shear flows. (arXiv:2211.09213v2 [cond-mat.soft] UPDATED)
Andreas Zöttl, Francesca Tesser, Daiki Matsunaga, Justine Laurent, Olivia Du Roure, Anke Lindner

The migration of helical particles in viscous shear flows plays a crucial role in chiral particle sorting. Attaching a non-chiral head to a helical particle leads to a rheotactic torque inducing particle reorientation. This phenomenon is responsible for bacterial rheotaxis observed for flagellated bacteria as Escherichia coli in shear flows. Here we use a high-resolution microprinting technique to fabricate micro-particles with controlled and tunable chiral shape consisting of a spherical head and helical tails of various pitch and handedness. By observing the fully time-resolved dynamics of these micro-particles in microfluidic channel flow, we gain valuable insights into chirality-induced orientation dynamics. Our experimental model system allows us to examine the effects of particle elongation, chirality, and head-heaviness for different flow rates on the orientation dynamics, while minimizing the influence of Brownian noise. Through our model experiments we demonstrate the existence of asymmetric bistability of the particle orientation perpendicular to the flow direction. We quantitatively explain the particle equilibrium orientations as a function of particle properties, initial conditions and flow rates, as well as the time-dependence of the reorientation dynamics through a theoretical model. The model parameters are determined using boundary element simulations and excellent agreement with experiments is obtained without any adjustable parameters. Our findings lead to a better understanding of chiral particle transport, bacterial rheotaxis and might allow the development of targeted delivery applications.

Epitaxial growth of atomically thin Ga2Se2 films on c-plane sapphire substrates. (arXiv:2212.11732v2 [cond-mat.mtrl-sci] UPDATED)
Mingyu Yu, Lottie Murray, Matthew Doty, Stephanie Law

Broadening the variety of two-dimensional (2D) materials and improving the synthesis of ultrathin films are crucial to the development of the semiconductor industry. As a state-of-the-art 2D material, Ga2Se2 has attractive optoelectronic properties when it reaches the atomically-thin regime. However, its van der Waals epitaxial growth, especially for the atomically-thin films, has seldom been studied. In this paper, we used molecular beam epitaxy to synthesize Ga2Se2 single-crystal films with a surface roughness down to 1.82 nm on c-plane sapphire substrates by optimizing substrate temperature, Se:Ga flux ratio, and growth rate. Then we used a 3-step mode to grow Ga2Se2 films with a thickness as low as 3 tetralayers and a surface roughness as low as 0.61 nm, far exceeding the performance of direct growth. Finally, we found that the surface morphology strongly depends on the Se:Ga flux ratio, and higher growth rates widened the suitable flux ratio window for growing Ga2Se2. Overall, this work advances the understanding of the vdW epitaxy growth mechanism for post-transition metal monochalcogenides on sapphire substrates.

Non-Abelian Anyons and Non-Abelian Vortices in Topological Superconductors. (arXiv:2301.11614v3 [cond-mat.supr-con] UPDATED)
Yusuke Masaki, Takeshi Mizushima, Muneto Nitta

Anyons are particles obeying statistics of neither bosons nor fermions. Non-Abelian anyons, whose exchanges are described by a non-Abelian group acting on a set of wave functions, are attracting a great attention because of possible applications to topological quantum computations. Braiding of non-Abelian anyons corresponds to quantum computations. The simplest non-Abelian anyons are Ising anyons which can be realized by Majorana fermions hosted by vortices or edges of topological superconductors, $\nu =5/2$ quantum Hall states, spin liquids, and dense quark matter. While Ising anyons are insufficient for universal quantum computations, Fibonacci anyons present in $\nu =12/5$ quantum Hall states can be used for universal quantum computations. Yang-Lee anyons are non-unitary counterparts of Fibonacci anyons. Another possibility of non-Abelian anyons (of bosonic origin) is given by vortex anyons, which are constructed from non-Abelian vortices supported by a non-Abelian first homotopy group, relevant for certain nematic liquid crystals, superfluid $^3$He, spinor Bose-Einstein condensates, and high density quark matter. Finally, there is a unique system admitting two types of non-Abelian anyons, Majorana fermions (Ising anyons) and non-Abelian vortex anyons. That is $^3P_2$ superfluids (spin-triplet, $p$-wave paring of neutrons), expected to exist in neutron star interiors as the largest topological quantum matter in our universe.

Suppression and amplification of phonon sidebands in transition metal dichalcogenides by optical feedback. (arXiv:2302.06338v2 [cond-mat.mtrl-sci] UPDATED)
Thomas Tenzler, Andreas Knorr, Manuel Katzer

Transition metal dichalcogenides (TMDCs) combine both strong light-matter-interaction and strong Coulomb-interaction for the formation of optically excitable excitons. Through radiative feedback control, a mechanism to control the linewidth can be applied, which modifies optical transition spectra. Here, we extend these investigations to the absorption spectra of TMDCs in a variety of geometries with respect to non-Markovian exciton-phonon-scattering contributions. Our approach is based on the self consistent solution of the microscopic Bloch equations and the macroscopic solution of the wave equation. We discuss the formation of a phonon sideband for MoSe$_2$ embedded in SiO$_2$, and two setups for enhancing or suppressing the phonon sideband in the spectrum.

Vortex wake patterns in superfluid $^{4}He$. (arXiv:2305.09051v2 [cond-mat.mes-hall] UPDATED)
Eugene B. Kolomeisky

Excitations in the form of quantized vortex rings are known to exist in superfluid $^{4}He$ at energies and momenta exceeding those of the Landau phonon-roton spectrum. They form a vortex branch of elementary excitations spectrum which is disconnected from the Landau spectrum. Interference of vortex ring excitations determines wake patterns due to uniformly traveling sources in bulk superfluid at low speeds and pressures. The dispersion law of these excitations resembles that of gravity waves on deep water with infrared wave number cutoff. As a result, vortex wake patterns featuring elements of the Kelvin ship wake are predicted. Specifically, at lowest speeds the pattern with fully developed transverse and diverging wavefronts is present. At intermediate speeds transverse wavefronts are absent within a cone whose opening angle increases with the source velocity. At largest speeds only diverging wavefronts confined within a cone whose opening angle decreases with the source velocity are found. When experimentally observed, these changes in appearance of wake patterns serve as indicators of the beginning part of the vortex branch of elementary excitations.

Continuous Wigner-Mott transition at $\nu=1/5$. (arXiv:2305.13355v2 [cond-mat.str-el] UPDATED)
Thomas G. Kiely, Debanjan Chowdhury

Electrons can organize themselves into charge-ordered states to minimize the effects of long-ranged Coulomb interactions. In the presence of a lattice, commensurability constraints lead to the emergence of incompressible Wigner-Mott (WM) insulators at various rational electron fillings, $\nu~=p/q$. The mechanism for quantum fluctuation-mediated melting of the WM insulators with increasing electron kinetic energy remains an outstanding problem. Here we analyze numerically the bandwidth-tuned transition out of the WM insulator at $\nu=1/5$ on infinite cylinders with varying circumference. For the two-leg ladder, the transition from the WM insulator to the Luttinger liquid proceeds via a distinct intermediate phase with gapless Cooper-pairs and gapped electronic excitations. The resulting Luther-Emery liquid is the analog of a strongly fluctuating superconductor. We place these results in the context of a low-energy bosonization based theory for the transition. On the five-leg cylinder, we provide numerical evidence for a direct continuous transition between the WM insulator and a metallic phase across which the spin and charge-gaps vanish simultaneously. We comment on the connections to ongoing experiments in dual-gated bilayer moir\'e transition metal dichalcogenide materials.

Topological Phases with Average Symmetries: the Decohered, the Disordered, and the Intrinsic. (arXiv:2305.16399v2 [cond-mat.str-el] UPDATED)
Ruochen Ma, Jian-Hao Zhang, Zhen Bi, Meng Cheng, Chong Wang

Global symmetries greatly enrich the landscape of topological quantum phases, playing an essential role from topological insulators to fractional quantum Hall effect. Topological phases in mixed quantum states, originating from decoherence in open quantum systems or disorders in imperfect crystalline solids, have recently garnered significant interest. Unlike pure states, mixed quantum states can exhibit average symmetries -- symmetries that keep the total ensemble invariant but not on each individual state. In this work, we present a systematic classification and characterization of average symmetry-protected topological (ASPT) phases applicable to generic symmetry groups, encompassing both average and exact symmetries, for bosonic and fermionic systems. Moreover, we formulate the theory of average symmetry-enriched topological (ASET) orders in disordered bosonic systems. Our systematic approach helps clarify nuanced issues in previous literature and uncovers compelling new physics. Notably, we discover that (1) the definition and classification of ASPT phases in decohered and disordered systems exhibit subtle differences; (2) despite these differences, ASPT phases in both settings can be classified and characterized under a unified framework of defect decoration and spectral sequence; (3) this systematic classification uncovers a plethora of ASPT phases that are intrinsically mixed, implying they can exclusively manifest in decohered or disordered systems where part of the symmetry is average; (4) similarly for ASET, we find intrinsically disordered phases exhibiting exotic anyon behaviors -- the ground states of such phases necessarily contain localized anyons, with gapless (yet still localized) excitation spectral.

Thermal pure matrix product state in two dimensions: tracking thermal equilibrium from paramagnet down to the Kitaev honeycomb spin liquid state. (arXiv:2308.02015v2 [cond-mat.str-el] UPDATED)
Matthias Gohlke, Atsushi Iwaki, Chisa Hotta

We present the first successful application of the matrix product state (MPS) representing a thermal quantum pure state (TPQ) in equilibrium in two spatial dimensions over almost the entire temperature range. We use the Kitaev honeycomb model as a prominent example hosting a quantum spin liquid (QSL) ground state to target the two specific-heat peaks previously solved nearly exactly using the free Majorana fermionic description. Starting from the high-temperature random state, our TPQ-MPS framework on a cylinder precisely reproduces these peaks, showing that the quantum many-body description based on spins can still capture the emergent itinerant Majorana fermions in a ${\mathbb Z}_2$ gauge field. The truncation process efficiently discards the high-energy states, eventually reaching the long-range entangled topological state approaching the exact ground state for a given finite size cluster. An advantage of TPQ-MPS over exact diagonalization or purification-based methods is its lowered numerical cost coming from a reduced effective Hilbert space even at finite temperature.

Experimental demonstration of an integrated on-chip p-bit core utilizing stochastic Magnetic Tunnel Junctions and 2D-MoS2 FETs. (arXiv:2308.10989v2 [cond-mat.mes-hall] UPDATED)
John Daniel, Zheng Sun, Xuejian Zhang, Yuanqiu Tan, Neil Dilley, Zhihong Chen, Joerg Appenzeller

Probabilistic computing is a novel computing scheme that offers a more efficient approach than conventional CMOS-based logic in a variety of applications ranging from optimization to Bayesian inference, and invertible Boolean logic. The probabilistic-bit (or p-bit, the base unit of probabilistic computing) is a naturally fluctuating entity that requires tunable stochasticity; by coupling low-barrier stochastic Magnetic Tunnel Junctions (MTJs) with a transistor circuit, a compact implementation is achieved. In this work, through integrating stochastic MTJs with 2D-MoS$_{2}$ FETs, the first on-chip realization of a key p-bit building block displaying voltage-controllable stochasticity is demonstrated. In addition, supported by circuit simulations, this work provides a careful analysis of the three transistor-one magnetic tunnel junction (3T-1MTJ) p-bit design, evaluating how the characteristics of each component influence the overall p-bit output. This understanding of the interplay between the characteristics of the transistors and the MTJ is vital for the construction of a fully functioning p-bit, making the design rules presented in this article key for future experimental implementations of scaled on-chip p-bit networks.

Entanglement transition in rod packings. (arXiv:2310.04903v2 [cond-mat.soft] UPDATED)
Yeonsu Jung, Thomas Plumb-Reyes, Hao-Yu Greg Lin, L. Mahadevan

Random packings of stiff rods are self-supporting mechanical structures stabilized by their geometrical and topological complexity. To understand why, we deploy X-ray computerized tomography to unveil the structure of the packing. This allows us to define and directly visualize the spatial variations in "entanglement," a mesoscopic field that characterizes the local average crossing number, a measure of the topological complexity of the packing. We show that the entanglement field has information that is distinct from the density, orientational order, and contact distribution of the packing. We find that increasing the aspect ratio of the constituent rods in a packing leads to an abrupt change in the entanglement, correlated with a sharp transition in the mechanical response of the packing. This leads to an entanglement phase diagram for the mechanical response of dense rod packings that is likely relevant for a broad range of problems that goes beyond our specific study.

Found 13 papers in prb
Date of feed: Wed, 18 Oct 2023 03:16:57 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)

Coherent x-ray diffraction of a semiregular Pt nanodot array
Thomas F. Keller, Roman Shayduk, Chan Kim, Nastasia Mukharamova, Arti Dangwal Pandey, Manuel Abuin, Vedran Vonk, Irene Fernandez-Cuesta, Miriam Barthelmess, Robert Frömter, Alexey Zozulya, Artur Erbe, and Andreas Stierle
Author(s): Thomas F. Keller, Roman Shayduk, Chan Kim, Nastasia Mukharamova, Arti Dangwal Pandey, Manuel Abuin, Vedran Vonk, Irene Fernandez-Cuesta, Miriam Barthelmess, Robert Frömter, Alexey Zozulya, Artur Erbe, and Andreas Stierle

Structural insight into nano-objects down to the atomic scale is one of the most important prerequisites to understand the properties of functional materials and will ultimately permit one to relate the size and shape of nanoparticles to their catalytic activity. We elucidate the potential of extrac…

[Phys. Rev. B 108, 134109] Published Tue Oct 17, 2023

Nonergodic dynamics for an impurity interacting with bosons in a tilted lattice
Pedro R. Nicácio Falcão and Jakub Zakrzewski
Author(s): Pedro R. Nicácio Falcão and Jakub Zakrzewski

The fate of a single particle immersed in and interacting with a bath of other particles localized in a tilted lattice is investigated. For tilt values comparable to the tunneling rate a slow-down of the dynamics is observed without, however, a clear localization of the impurity. For a large tilt an…

[Phys. Rev. B 108, 134201] Published Tue Oct 17, 2023

Phases of $^{4}\mathrm{He}$ and ${\mathrm{H}}_{2}$ adsorbed on doped graphene
M. C. Gordillo and J. Boronat
Author(s): M. C. Gordillo and J. Boronat

The influence of attractive boron impurities, embedded on a graphene sheet, on the phase diagrams of $^{4}\mathrm{He}$ and ${\mathrm{H}}_{2}$ adsorbed on top was studied using the diffusion Monte Carlo method. The doping of graphene was made by distributing the boron atoms following the same pattern…

[Phys. Rev. B 108, 134505] Published Tue Oct 17, 2023

Tailoring of interference-induced surface superconductivity by an applied electric field
Yunfei Bai, Libo Zhang, Xiaobing Luo, A. A. Shanenko, and Yajiang Chen
Author(s): Yunfei Bai, Libo Zhang, Xiaobing Luo, A. A. Shanenko, and Yajiang Chen

Nucleation of the pair condensate near surfaces above the upper critical magnetic field and the pair-condensate enhancement/suppression induced by changes in the electron-phonon interaction at interfaces are the most known examples of the surface superconductivity. Recently, another example has been…

[Phys. Rev. B 108, 134506] Published Tue Oct 17, 2023

Critical pressure values for graphene membrane covering a slit
Alexander V. Savin and Sergey V. Dmitriev
Author(s): Alexander V. Savin and Sergey V. Dmitriev

Graphene is impervious to gases, so the question arises of how much pressure can few-layer graphene covering a slit withstand. Using the molecular dynamics model with a reduced number of degrees of freedom, a multilayer graphene sheet lying on an $h$-BN substrate with a slit of width $d$ is consider…

[Phys. Rev. B 108, 144107] Published Tue Oct 17, 2023

Hard antiphase domain boundaries in strontium titanate: A comparison of Landau-Ginzburg-Devonshire and ab initio results
A. Tröster, J. Pils, F. Bruckner, I. Rychetsky, C. Verdi, and W. Schranz
Author(s): A. Tröster, J. Pils, F. Bruckner, I. Rychetsky, C. Verdi, and W. Schranz

Recently, the emergence of polarity of so-called hard antiphase boundaries in strontium titanate was investigated using atomistic simulations based on machine-learned force fields. Comparing the resulting order parameter (OP) and polarization profiles to those obtained from numerical solutions based…

[Phys. Rev. B 108, 144108] Published Tue Oct 17, 2023

Defect-enhanced diffusion of magnetic skyrmions
Philipp Rieger, Markus Weißenhofer, and Ulrich Nowak
Author(s): Philipp Rieger, Markus Weißenhofer, and Ulrich Nowak

Defects, i.e., inhomogeneities of the underlying lattice, are ubiquitous in magnetic materials and can have a crucial impact on their applicability in spintronic devices. For magnetic skyrmions, localized and topologically nontrivial spin textures, they give rise to a spatially inhomogeneous energy …

[Phys. Rev. B 108, 144417] Published Tue Oct 17, 2023

Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance
Peter Stano, Takashi Nakajima, Akito Noiri, Seigo Tarucha, and Daniel Loss
Author(s): Peter Stano, Takashi Nakajima, Akito Noiri, Seigo Tarucha, and Daniel Loss

When a quantum-dot electron spin is electrically driven to perform coherent Rabi oscillations, it can polarize nuclear spins through a resonance analogous to the Hartmann-Hahn effect known from NMR. Here, the authors theoretically analyze such a polarization rate in a generic setup including GaAs, Si, and Ge, and both electron and hole spin qubits. They present measurements in n-GaAs and estimate that the effect is also observable in Si. It might offer control over the Overhauser nuclear field in gated quantum dots.

[Phys. Rev. B 108, 155306] Published Tue Oct 17, 2023

Exciton many-body interactions and charge transfer in ${\mathrm{CsPbBr}}_{3}$/graphene derivatives
Naresh Chandra Maurya, Riyanka Karmakar, Rajesh Kumar Yadav, Pravrati Taank, Santu K. Bera, Anirban Mondal, Dipendranath Mandal, Megha Shrivastava, Md. Nur Hasan, Tuhin Kumar Maji, Debjani Karmakar, and K. V. Adarsh
Author(s): Naresh Chandra Maurya, Riyanka Karmakar, Rajesh Kumar Yadav, Pravrati Taank, Santu K. Bera, Anirban Mondal, Dipendranath Mandal, Megha Shrivastava, Md. Nur Hasan, Tuhin Kumar Maji, Debjani Karmakar, and K. V. Adarsh

Charge separation and many-body interactions at the interface of the light-absorbing semiconductor and contact layer are of crucial importance to the photophysical properties and optoelectronic device performance. Here, we report the exciton many-body interactions and charge transfer dynamics at the…

[Phys. Rev. B 108, 155417] Published Tue Oct 17, 2023

Singular topology of scattering matrices
Cheng Guo, Jiazheng Li, Meng Xiao, and Shanhui Fan
Author(s): Cheng Guo, Jiazheng Li, Meng Xiao, and Shanhui Fan

The scattering matrix is a crucial characterization of a physical system. The authors present here a systematic topological theory of scattering matrices, focusing on their singular values and vectors. They identify topological characteristics such as winding number, Berry phase, and skew polarization. The theory uncovers the topological nature of coherent perfect absorption and introduces coherent perfect extinction, where a coherent wave is completely extinguished through interference. These findings advance the understanding of scattering and have implications for novel wave devices.

[Phys. Rev. B 108, 155418] Published Tue Oct 17, 2023

Effects of anisotropy on the high-field magnetoresistance of Weyl semimetals
A. S. Dotdaev, Ya. I. Rodionov, K. I. Kugel, and B. A. Aronzon
Author(s): A. S. Dotdaev, Ya. I. Rodionov, K. I. Kugel, and B. A. Aronzon

We study the effects of anisotropy on the magnetoresistance of Weyl semimetals in the ultraquantum regime. We utilize the fact that many Weyl semimetals are approximately axially anisotropic. We find that anisotropy manifests itself in the strong dependence of the magnetoresistance on the polar and …

[Phys. Rev. B 108, 165125] Published Tue Oct 17, 2023

Disordered monitored free fermions
Marcin Szyniszewski, Oliver Lunt, and Arijeet Pal
Author(s): Marcin Szyniszewski, Oliver Lunt, and Arijeet Pal

The authors investigate here the dynamics of free fermions in a random potential system under continuous monitoring. Repeated measurements are known to induce an entanglement phase transition from a logarithmically entangled critical state to area law, while disorder leads to Anderson localization. They show that their interplay results in a stable critical phase at finite disorder strength and dissipation, which drive a transition consistent with Berezinskii-Kosterlitz-Thouless universality. This work is important for testing such phase transitions in quantum dot arrays and nanowires.

[Phys. Rev. B 108, 165126] Published Tue Oct 17, 2023

Realization of ideal unconventional Weyl states with arbitrary topological charge
Yuanchuan Biao and Rui Yu
Author(s): Yuanchuan Biao and Rui Yu

Weyl points in crystalline materials can be treated as magnetic monopoles in momentum space, with topological charges inscribed by Chern numbers. The main method of finding Weyl states with topological charges greater than one, i.e., unconventional Weyl states, is to take advantage of crystal symmet…

[Phys. Rev. B 108, 165128] Published Tue Oct 17, 2023

Found 4 papers in prl
Date of feed: Wed, 18 Oct 2023 03:16:54 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)

Quantum Trajectories for Time-Local Non-Lindblad Master Equations
Tobias Becker, Ché Netzer, and André Eckardt
Author(s): Tobias Becker, Ché Netzer, and André Eckardt

For the efficient simulation of open quantum systems, we often use quantum jump trajectories given by pure states that evolve stochastically to unravel the dynamics of the underlying master equation. In the Markovian regime, when the dynamics is described by a Gorini-Kossakowski-Sudarshan-Lindblad (…

[Phys. Rev. Lett. 131, 160401] Published Tue Oct 17, 2023

Momentum Amplituhedron for $\mathsc{N}=6$ Chern-Simons-Matter Theory: Scattering Amplitudes from Configurations of Points in Minkowski Space
Tomasz Łukowski and Jonah Stalknecht
Author(s): Tomasz Łukowski and Jonah Stalknecht

In this Letter, we define the Aharony-Bergman-Jafferis-Maldacena loop momentum amplituhedron, which is a geometry encoding Aharony-Bergman-Jafferis-Maldacena planar tree-level amplitudes and loop integrands in the three-dimensional spinor helicity space. Translating it to the space of dual momenta p…

[Phys. Rev. Lett. 131, 161601] Published Tue Oct 17, 2023

Extraction of the Parton Momentum-Fraction Dependence of Generalized Parton Distributions from Exclusive Photoproduction
Jian-Wei Qiu and Zhite Yu
Author(s): Jian-Wei Qiu and Zhite Yu

The $x$ dependence of hadrons’ generalized parton distributions (GPDs) $\mathcal{F}(x,ξ,t)$ is the most difficult to extract from the existing known processes, while the $ξ$ and $t$ dependence are uniquely determined by the kinematics of the scattered hadron. We study the single diffractive hard exc…

[Phys. Rev. Lett. 131, 161902] Published Tue Oct 17, 2023

Symmetric Kondo Lattice States in Doped Strained Twisted Bilayer Graphene
Haoyu Hu, Gautam Rai, Lorenzo Crippa, Jonah Herzog-Arbeitman, Dumitru Călugăru, Tim Wehling, Giorgio Sangiovanni, Roser Valentí, Alexei M. Tsvelik, and B. Andrei Bernevig
Author(s): Haoyu Hu, Gautam Rai, Lorenzo Crippa, Jonah Herzog-Arbeitman, Dumitru Călugăru, Tim Wehling, Giorgio Sangiovanni, Roser Valentí, Alexei M. Tsvelik, and B. Andrei Bernevig

We use the topological heavy fermion (THF) model and its Kondo lattice (KL) formulation to study the possibility of a symmetric Kondo (SK) state in twisted bilayer graphene. Via a large-$N$ approximation, we find a SK state in the KL model at fillings $ν=0,±1,±2$ where a KL model can be constructed.…

[Phys. Rev. Lett. 131, 166501] Published Tue Oct 17, 2023

Found 2 papers in pr_res
Date of feed: Wed, 18 Oct 2023 03:16:56 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)

Optimizing for an arbitrary Schrödinger cat state
Matthias G. Krauss, Christiane P. Koch, and Daniel M. Reich
Author(s): Matthias G. Krauss, Christiane P. Koch, and Daniel M. Reich

We derive a set of functionals for optimization towards an arbitrary cat state and demonstrate their application by optimizing the dynamics of a Kerr-nonlinear Hamiltonian with two-photon driving. The versatility of our framework allows us to adapt our functional towards optimization of maximally en…

[Phys. Rev. Research 5, 043051] Published Tue Oct 17, 2023

Benchmarking noisy intermediate scale quantum error mitigation strategies for ground state preparation of the HCl molecule
Tim Weaving, Alexis Ralli, William M. Kirby, Peter J. Love, Sauro Succi, and Peter V. Coveney
Author(s): Tim Weaving, Alexis Ralli, William M. Kirby, Peter J. Love, Sauro Succi, and Peter V. Coveney

Due to numerous limitations including restrictive qubit topologies, short coherence times, and prohibitively high noise floors, few quantum chemistry experiments performed on existing noisy intermediate-scale quantum hardware have achieved the high bar of chemical precision, namely energy errors to …

[Phys. Rev. Research 5, 043054] Published Tue Oct 17, 2023

Found 11 papers in nano-lett
Date of feed: Tue, 17 Oct 2023 13:08:52 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] Semiconducting Transition Metal Dichalcogenide Heteronanotubes with Controlled Outer-Wall Structures
Yohei Yomogida, Mai Nagano, Zheng Liu, Kan Ueji, Md. Ashiqur Rahman, Abdul Ahad, Akane Ihara, Hiroyuki Nishidome, Takashi Yagi, Yusuke Nakanishi, Yasumitsu Miyata, and Kazuhiro Yanagi

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01761

[ASAP] Twist-Angle-Dependent Electronic Properties of Exfoliated Single Layer MoS2 on Au(111)
Ishita Pushkarna, Árpád Pásztor, and Christoph Renner

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02804

[ASAP] Stabilizing the Inverted Phase of a WSe2/BLG/WSe2 Heterostructure via Hydrostatic Pressure
Máté Kedves, Bálint Szentpéteri, Albin Márffy, Endre Tóvári, Nikos Papadopoulos, Prasanna K. Rout, Kenji Watanabe, Takashi Taniguchi, Srijit Goswami, Szabolcs Csonka, and Péter Makk

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Nano Letters
DOI: 10.1021/acs.nanolett.3c03029

[ASAP] Local Nanostrain Engineering of Monolayer MoS2 Using Atomic Force Microscopy-Based Thermomechanical Nanoindentation
Shunyu Chang, Yongda Yan, and Yanquan Geng

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c01809

[ASAP] Exchange Interactions and Intermolecular Hybridization in a Spin-1/2 Nanographene Dimer
N. Krane, E. Turco, A. Bernhardt, D. Jacob, G. Gandus, D. Passerone, M. Luisier, M. Juríček, R. Fasel, J. Fernández-Rossier, and P. Ruffieux

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02633

[ASAP] Classification and Simulation of Structural Phase Transformation-Induced Interfacial Defects in Group VI Transition-Metal Dichalcogenide Monolayers
Yang Xia, Joel M. Berry, and Mikko P. Haataja

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02876

[ASAP] Symmetry Engineering in Twisted Bilayer WTe2
Yijin Zhang, Keisuke Kamiya, Takato Yamamoto, Masato Sakano, Xiaohan Yang, Satoru Masubuchi, Shota Okazaki, Keisuke Shinokita, Tongmin Chen, Kohei Aso, Yukiko Yamada-Takamura, Yoshifumi Oshima, Kenji Watanabe, Takashi Taniguchi, Kazunari Matsuda, Takao Sasagawa, Kyoko Ishizaka, and Tomoki Machida

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02327

[ASAP] Submillimeter-Long WS2 Nanotubes: The Pathway to Inorganic Buckypaper
Vojtěch Kundrát, Rita Rosentsveig, Kristýna Bukvišová, Daniel Citterberg, Miroslav Kolíbal, Shachar Keren, Iddo Pinkas, Omer Yaffe, Alla Zak, and Reshef Tenne

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02783

[ASAP] MoS2-Thin Film Transistor Based Flexible 2T1C Driving Circuits for Active-Matrix Displays
Biying Huang, Yuchen Wang, Lu Li, Qinqin Wang, Yalin Peng, Xiuzhen Li, Yangkun Zhang, Luojun Du, Wei Yang, Dongxia Shi, Na Li, and Guangyu Zhang

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Nano Letters
DOI: 10.1021/acs.nanolett.3c02533

[ASAP] Strong Coupling of Coherent Phonons to Excitons in Semiconducting Monolayer MoTe2
Charles J. Sayers, Armando Genco, Chiara Trovatello, Stefano Dal Conte, Vladislav O. Khaustov, Jorge Cervantes-Villanueva, Davide Sangalli, Alejandro Molina-Sanchez, Camilla Coletti, Christoph Gadermaier, and Giulio Cerullo

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Nano Letters
DOI: 10.1021/acs.nanolett.3c01936

[ASAP] Ultraflat Graphene Oxide Membranes with Newton-Ring Prepared by Vortex Shear Field for Ion Sieving
Tianqi Liu, Xin Zhang, Jing Liang, Wenbin Liang, Wei Qi, Longlong Tian, Lijuan Qian, Zhan Li, and Ximeng Chen

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c02613

Found 10 papers in acs-nano
Date of feed: Tue, 17 Oct 2023 13:05:11 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] Exceptional Thermochemical Stability of Graphene on N-Polar GaN for Remote Epitaxy
Joonghoon Choi, Junseok Jeong, Xiangyu Zhu, Junghwan Kim, Bong Kyun Kang, Qingxiao Wang, Bo-In Park, Seokje Lee, Jekyung Kim, Hyunseok Kim, Jinkyoung Yoo, Gyu-Chul Yi, Dong-Seon Lee, Jeehwan Kim, Suklyun Hong, Moon J. Kim, and Young Joon Hong

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ACS Nano
DOI: 10.1021/acsnano.3c06828

[ASAP] Root Exposure of Graphitic Carbon Nitride (g-C3N4) Modulates Metabolite Profile and Endophytic Bacterial Community to Alleviate Cadmium- and Arsenate-Induced Phytotoxicity to Rice (Oryza sativa L.)
Yi Hao, Zeyu Cai, Chuanxin Ma, Jason C. White, Yini Cao, Zhaofeng Chang, Xinxin Xu, Lanfang Han, Weili Jia, Jian Zhao, and Baoshan Xing

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ACS Nano
DOI: 10.1021/acsnano.3c03066

[ASAP] Templated Laser-Induced-Graphene-Based Tactile Sensors Enable Wearable Health Monitoring and Texture Recognition via Deep Neural Network
Jiawen Ji, Wei Zhao, Yuliang Wang, Qiushi Li, and Gong Wang

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ACS Nano
DOI: 10.1021/acsnano.3c05838

[ASAP] Moiré Superlattice Structure of Pleated Trilayer Graphene Imaged by 4D Scanning Transmission Electron Microscopy
Yi Wen, Matthew J. Coupin, Linlin Hou, and Jamie H. Warner

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ACS Nano
DOI: 10.1021/acsnano.2c12179

[ASAP] Topological Design and Synthesis of High-Spin Aza-triangulenes without Jahn–Teller Distortions
James Lawrence, Yuanyuan He, Haipeng Wei, Jie Su, Shaotang Song, Alina Wania Rodrigues, Daniel Miravet, Pawel Hawrylak, Jianwei Zhao, Jishan Wu, and Jiong Lu

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ACS Nano
DOI: 10.1021/acsnano.3c05974

[ASAP] Laser-Induced MXene-Functionalized Graphene Nanoarchitectonics-Based Microsupercapacitor for Health Monitoring Application
Sujit Deshmukh, Kalyan Ghosh, Martin Pykal, Michal Otyepka, and Martin Pumera

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ACS Nano
DOI: 10.1021/acsnano.3c07319

[ASAP] Quantum Confinement in Epitaxial Armchair Graphene Nanoribbons on SiC Sidewalls
Thi Thuy Nhung Nguyen, Stephen R. Power, Hrag Karakachian, Ulrich Starke, and Christoph Tegenkamp

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ACS Nano
DOI: 10.1021/acsnano.3c06449

[ASAP] Origins of Fermi Level Pinning for Ni and Ag Metal Contacts on Tungsten Dichalcogenides
Xinglu Wang, Yaoqiao Hu, Seong Yeoul Kim, Rafik Addou, Kyeongjae Cho, and Robert M. Wallace

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ACS Nano
DOI: 10.1021/acsnano.3c06494

[ASAP] Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene
Seyedamin Firouzeh, Sara Illescas-Lopez, Md Anik Hossain, Juan Manuel Cuerva, Luis Álvarez de Cienfuegos, and Sandipan Pramanik

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ACS Nano
DOI: 10.1021/acsnano.3c06903

[ASAP] Nonlinear Optical Responses of Janus MoSSe/MoS2 Heterobilayers Optimized by Stacking Order and Strain
Nguyen Tuan Hung, Kunyan Zhang, Vuong Van Thanh, Yunfan Guo, Alexander A. Puretzky, David B. Geohegan, Jing Kong, Shengxi Huang, and Riichiro Saito

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ACS Nano
DOI: 10.1021/acsnano.3c04436

Found 1 papers in scipost

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

Mode-Shell correspondence, a unifying theory in topological physics -- Part I: Chiral number of zero-modes, by Lucien Jezequel, Pierre Delplace
< author missing >
Submitted on 2023-10-12, refereeing deadline 2023-11-14.