Dynamical Correlation of the Post-quench Non-thermal Equilibrium State

Abstract:After a quantum quench, the integrable system is expected to relax to a non-thermal equilibrium state (NTES) whose local properties are believed to be governed by a generalized Gibbs ensemble (GGE). Combining quench action and the form factor approach, we compute the field-field correlation in the NTES produced by an interaction quench of the Lieb-Liniger model. The spectral distribution is shown to be qualitatively different from that of a thermal equilibrium state (TES): a new dispersion branch appears whose microscopic mechanism can be traced to the algebraic decaying tail for the root density distribution function, and indicates the existence of a broader family of NTES featuring similar spectral property.

Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas); Statistical Mechanics (cond-mat.stat-mech)

arXiv:2601.06987 [quant-ph]

(or arXiv:2601.06987v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2601.06987 Focus to learn more arXiv-issued DOI via DataCite

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