cond-mat.stat-mech papers

Successive single-q and double-q orders in an anisotropic XY model on the diamond structure: a model for quadrupole ordering in PrIr $_2$ Zn $_{20}$

This study utilizes classical Monte Carlo simulations of an effective $\Gamma_3$ quadrupole model on a diamond lattice to demonstrate that the competition between magnetic fields and quadrupole anisotropy, mediated by a crucial symmetry-allowed biquadratic interaction, drives successive single- $q$ and double- $q$ ordering transitions that reproduce the experimentally observed weak-field topology in PrIr $_2$ Zn $_{20}$ .

Kaito Sasa, Kazumasa Hattori2026-03-06🔬 physics

Disorder effects in Ising metamagnetic phase transition

This study employs Monte Carlo simulations to investigate how nonmagnetic impurities and quenched random magnetic fields suppress the antiferromagnetic phase transition in Ising metamagnets, revealing distinct linear and nonlinear dependencies of the critical temperature on disorder concentration and field width, respectively, while confirming that the pure system's Néel temperature is recovered in the limit of vanishing disorder.

A. B. Acharyya, M. Acharyya2026-03-06🔬 physics

The Statistical Mechanics of Indistinguishable Energy States and the Glass Transition

This paper explores the statistical mechanics of particles in indistinguishable energy states by adapting combinatorial counting methods to derive exact distribution functions, revealing that classical particles within this framework exhibit a definitive glass transition characterized by the vanishing of configurational entropy below a finite temperature.

Shimul Akhanjee2026-03-06🔬 physics

A minimal electrostatic theory for the Seebeck coefficient in liquids

This paper proposes a minimal electrostatic theory based on solvation entropy and the extended Born equation to quantitatively explain the large Seebeck coefficients in liquids, identifying key factors such as ion valence, cationic radius, and the temperature dependence of the dielectric constant as crucial determinants of the response.

Wataru Kobayashi2026-03-06🔬 cond-mat.mtrl-sci

Diffusion disorder in the contact process

Although power-counting suggests that spatially inhomogeneous diffusion is irrelevant in the contact process, large-scale simulations reveal that such disorder destabilizes the standard directed-percolation critical point by generating effective random-mass disorder, thereby driving the transition into an infinite-randomness universality class.

Valentin Anfray, Manisha Dhayal, Hong-Yan Shih + 1 more2026-03-06🔬 physics

Extended dynamical density functional theory for nonisothermal binary systems including momentum density

This paper derives a new extended dynamical density functional theory (EDDFT) for nonisothermal binary systems by incorporating momentum and energy densities via the Mori-Zwanzig-Forster projection operator technique, thereby enabling the description of both diffusive and convective dynamics while yielding exact functionals for hard spheres and correctly predicting the speed of sound.

Michael te Vrugt, Hartmut Löwen, Helmut R. Brand + 1 more2026-03-06🔬 cond-mat.mes-hall

Fluctuation-induced quadrupole order in magneto-electric materials

This paper proposes a universal framework explaining quadrupolar order in magneto-electric materials as a composite phase emerging from a parent state driven by thermal fluctuations and symmetry, offering a predictive approach for transition temperatures and strain coupling without requiring explicit microscopic details.

Finja Tietjen, R. Matthias Geilhufe2026-03-06🔬 physics

Fokker-Planck description of an active Brownian particle with rotational inertia

This paper develops a perturbative framework based on the Fokker-Planck equation to derive an explicit analytical expression for the mean-squared displacement of active Brownian particles with finite rotational inertia, a result that is validated through numerical simulations.

Lingyi Wang, Ziluo Zhang, Zhongqiang Xiong + 3 more2026-03-06🔬 physics

Sampling the Liquid-Gas Critical Point with Boltzmann Generators

This paper demonstrates that Boltzmann Generators can effectively sample the liquid-gas critical point of a Lennard-Jones fluid and capture critical signatures, though their current utility is constrained by small system sizes that suppress large-scale fluctuations.

Luigi de Santis, John Russo, Andrea Ninarello2026-03-06🔬 physics

Machine Learning the Strong Disorder Renormalization Group Method for Disordered Quantum Spin Chains

This paper demonstrates that a graph neural network trained on the Strong Disorder Renormalization Group (SDRG) method can accurately infer the entanglement structure and pairing hierarchy of disordered long-range interacting quantum spin chains, achieving quantitative agreement with SDRG predictions across various interaction exponents and temperatures without retraining.

A. Ustyuzhanin, J. Vahedi, S. Kettemann2026-03-06⚛️ quant-ph

Waiting-time based entropy estimators in continuous space without Markovian events

This paper introduces a novel entropy production estimator for continuous systems with limited resolution that relies solely on the frequency and duration of particle transitions across spatial regions, eliminating the need for Markovian events or discrete underlying dynamics.

Jonas H. Fritz, Udo Seifert2026-03-06🔬 physics

The bliss of dimensionality: how an unsupervised criterion identifies optimal low-resolution representations of high-dimensional datasets

This paper validates the Relevance-Resolution framework as a robust unsupervised method for identifying optimal low-resolution representations of high-dimensional data, demonstrating that its information-theoretic criteria consistently align with ground-truth Kullback-Leibler divergence minimization across diverse synthetic and physical datasets.

Margherita Mele, Daniel Campos Moreno, Raffaello Potestio2026-03-06🔬 physics

Wealth Tax Neutrality as Drift-Shift Symmetry: A Statistical Physics Formulation

This paper reformulates the concept of neutral wealth taxation as a drift-shift symmetry in stochastic wealth dynamics, demonstrating that while a proportional tax preserves the underlying statistical structure of wealth distribution, practical implementation failures correspond to specific violations of this symmetry that introduce new, non-neutral physical effects.

Anders G. Froeseth2026-03-06🔬 physics

Dynamical quantum phase transitions through the lens of mode dynamics

This paper establishes that dynamical quantum phase transitions (DQPTs) in generic quadratic fermionic systems are fundamentally characterized by the restoration of spin-flip symmetry in specific zero-energy dynamical critical modes, providing a unified framework that explains the necessary but insufficient conditions for DQPTs and their relationship to ground-state quantum phase transitions.

Akash Mitra, Shashi C. L. Srivastava2026-03-06⚛️ quant-ph

Finite-size scaling in quasi-3D stick percolation

This study uses Monte Carlo simulations to demonstrate that quasi-three-dimensional stick percolation systems, despite having a higher percolation threshold than their two-dimensional counterparts, share the same universal finite-size scaling function as 2D continuum and lattice percolation.

Ryan K. Daniels2026-03-06🔬 physics

Extreme Values of Infinite-Measure Processes

This paper establishes that the extreme value statistics of non-stationary, recurrent systems governed by infinite ergodic theory and an infinite invariant density are determined by the return exponent and the infinite measure, leading to a distinct universality class that deviates from the classical Fréchet, Gumbel, and Weibull distributions.

Talia Baravi, Eli Barkai2026-03-06🔬 physics

Optimal Decoding with the Worm

The paper introduces the "worm decoder," a Markov-Chain Monte-Carlo-based algorithm that achieves optimal decoding for various qLDPC codes by approximating logical error probabilities, offering rigorous efficiency guarantees for typical errors and demonstrating superior performance over existing methods even under depolarizing noise through the use of soft information.

Zac Tobias, Nikolas P. Breuckmann, Benedikt Placke2026-03-06⚛️ quant-ph

Measurement Induced Asymmetric Entanglement in Deconfined Quantum Critical Ground State

This paper numerically demonstrates that weak measurements on the ground state of a one-dimensional spin system near a deconfined quantum critical point induce an asymmetric restructuring of entanglement across the phase boundary, suggesting the emergence of a weak first-order phase transition in the thermodynamic limit.

K. G. S. H. Gunawardana2026-03-06⚛️ quant-ph

Anomalous scaling of heterogeneous elastic lines: a new picture from sample to sample fluctuations

This paper investigates a discrete model of a heterogeneous elastic line with random springs, demonstrating that when the spring constant distribution follows a power law with exponent $\mu < 1$ , the system exhibits anomalous scaling driven by sample-to-sample fluctuations and abrupt shape jumps, a finding that challenges previous theoretical predictions and is validated by numerical simulations.

Maximilien Bernard, Pierre Le Doussal, Alberto Rosso + 1 more2026-03-05🔬 physics

Understanding the approach to thermalization from the eigenspectrum of non-Abelian gauge theories

Using lattice gauge theory techniques, this study analyzes the spectral properties of SU(3) gauge theory via overlap Dirac eigenvalues to reveal fractal-like clustering near the chiral crossover and estimate a thermalization time of approximately 1.44 fm/c by linking non-equilibrium chaotic momentum modes to thermal magnetic scales.

Harshit Pandey, Ravi Shanker, Sayantan Sharma2026-03-05⚛️ hep-ph

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cond-mat.stat-mech

Successive single-q and double-q orders in an anisotropic XY model on the diamond structure: a model for quadrupole ordering in PrIr2_22​Zn20_{20}20​