cond-mat.mes-hall

General Conditions for Axis Dependent Conduction Polarity

This paper theoretically derives and validates transparent, quantitative inequalities that serve as necessary and sufficient criteria for identifying and predicting materials exhibiting Axis-Dependent Conduction Polarity (ADCP), a phenomenon where electrical transport is p-type along one crystallographic direction and n-type along the perpendicular direction.

Localization and universality of three-dimensional pseudospin-$s$ fermions

This paper establishes a unified theory showing that while the Drude conductivity of three-dimensional disordered fermions depends on pseudospin, their leading quantum interference correction exhibits a striking universality where the sign of localization or antilocalization is determined solely by the parity of the pseudospin, though interband scattering can suppress antilocalization in specific cases like $s=3/2$.

$P$-wave Orbital Magnetism

This paper proposes a new concept of $p$-wave orbital magnetism arising from loop-current-induced orbital textures in a 2D topological lattice model, which is protected by combined translation and time-reversal symmetry and can be detected via orbital Hall conductivity.

Large Scale Optimization of Disordered Hubbard Models through Tensor and Neural Networks

This paper demonstrates that a vision-based neural network trained on tensor-network-generated data can efficiently tune large-scale disordered 2D quantum-dot arrays by leveraging a sliding-window approach that infers critical disorder parameters from local $3\times 3$ regions, thereby bypassing the computational intractability of simulating the full system's exponentially large Hilbert space.

Proximitized Topological Insulator Charge Island Fabricated via In Situ Multi-Angle Stencil Lithography

Landau levels and magneto-optics in 30$^\circ$ quasi-periodic twisted bilayer graphene

This paper establishes a symmetry-based theoretical framework using a quasi-band formalism to describe Landau levels and magneto-optical conductivity in 30$^\circ$ quasi-periodic twisted bilayer graphene, revealing distinctive spectral features and angular-momentum selection rules driven by its 12-fold rotational symmetry.

Asymptotic Metrological Scaling and Concentration in Chaotic Floquet Dynamics

This paper investigates quantum sensing protocols utilizing Haar random unitary gates within Floquet chaotic dynamics, demonstrating that while asymptotic precision scales linearly (shot-noise limit) in large Hilbert spaces, non-asymptotic regimes offer quantum advantages, and it further establishes that Floquet random quantum circuits effectively mimic global unitary operators in the limit of large local dimensions.

Ultrafast Light-Induced Magnetoelectric Effect in van der Waals Magnetic Semiconductor Heterostructures

This study demonstrates that ultrafast optical excitation in a WS$_2$/CrGeTe$_3$ van der Waals heterostructure induces an opposite-sign magnetic torque compared to isolated films, driven by interface charge transfer altering magnetic anisotropy and spin current injection, thereby enabling new pathways for ultrafast magnetization manipulation.

Coherent Microwave Driving of Domain Wall Depinning in a Ferrimagnetic Garnet

This paper demonstrates that coherent microwave driving can resonantly excite localized domain wall oscillations in a ferrimagnetic garnet, enabling efficient depinning and manipulation of magnetic textures through nonlinear dynamics at reduced external magnetic fields.

Optical conductivity of topological semimetal Nb$_{2n+1}$Si$_n$Te$_{4n+2}$

This paper analytically investigates the optical conductivity of the layered topological semimetal Nb$_{2n+1}$Si$_n$Te$_{4n+2}$, revealing strong anisotropy in the Drude weight at zero temperature while demonstrating that interband conductivity exhibits a universal linear frequency dependence in both directions, with these findings remaining valid up to experimentally relevant temperatures.