Superdiffusion, normal diffusion and chaos in semiclassical Bose-Hubbard chains

Fuente: arXiv
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Main Authors: Marković, Dragan, Čubrović, Mihailo
Format: Preprint
Published: 2025
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author Marković, Dragan
Čubrović, Mihailo
author_facet Marković, Dragan
Čubrović, Mihailo
contents We study the evolution of two-point correlation functions of one-dimensional Bose-Hubbard model in the semiclassical regime in the framework of Truncated Wigner Approximation (TWA) with quantum jumps as first-order corrections. At early times, the correlation functions show strong superdiffusion with universal integer exponents determined solely by the initial conditions and completely insensitive to system parameters and chaos. Only after a long time this regime crosses over to normal diffusion regime which is most robust when nonintegrability is strong. For strong nonintegrability, the system ends up in a homogeneous state while for weak nonintegrability the oscillations and inhomogeneities persist, despite the fact that chaos is nearly always strong and only weakly depends on nonintegrability parameter. We conclude that the superidiffusive regime is neither prethermalized nor a precursor to thermalization but a novel early-time phenomenon related to a special scaling symmetry of the Bose-Hubbard Hamiltonian.
format Preprint
id arxiv_https___arxiv_org_abs_2502_19584
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Superdiffusion, normal diffusion and chaos in semiclassical Bose-Hubbard chains
Marković, Dragan
Čubrović, Mihailo
Quantum Physics
Quantum Gases
Statistical Mechanics
Chaotic Dynamics
We study the evolution of two-point correlation functions of one-dimensional Bose-Hubbard model in the semiclassical regime in the framework of Truncated Wigner Approximation (TWA) with quantum jumps as first-order corrections. At early times, the correlation functions show strong superdiffusion with universal integer exponents determined solely by the initial conditions and completely insensitive to system parameters and chaos. Only after a long time this regime crosses over to normal diffusion regime which is most robust when nonintegrability is strong. For strong nonintegrability, the system ends up in a homogeneous state while for weak nonintegrability the oscillations and inhomogeneities persist, despite the fact that chaos is nearly always strong and only weakly depends on nonintegrability parameter. We conclude that the superidiffusive regime is neither prethermalized nor a precursor to thermalization but a novel early-time phenomenon related to a special scaling symmetry of the Bose-Hubbard Hamiltonian.
title Superdiffusion, normal diffusion and chaos in semiclassical Bose-Hubbard chains
topic Quantum Physics
Quantum Gases
Statistical Mechanics
Chaotic Dynamics
url https://arxiv.org/abs/2502.19584