Locally quasi-stationary states in noninteracting spin chains
Strongly Correlated Electrons
2020-03-30 v3 Mathematical Physics
math.MP
Quantum Physics
Abstract
Locally quasi-stationary states (LQSS) were introduced as inhomogeneous generalisations of stationary states in integrable systems. Roughly speaking, LQSSs look like stationary states, but only locally. Despite their key role in hydrodynamic descriptions, an unambiguous definition of LQSSs was not given. By solving the dynamics in inhomogeneous noninteracting spin chains, we identify the set of LQSSs as a subspace that is invariant under time evolution, and we explicitly construct the latter in a generalised XY model. As a by-product, we exhibit an exact generalised hydrodynamic theory (including "quantum corrections").
Keywords
Cite
@article{arxiv.1910.01046,
title = {Locally quasi-stationary states in noninteracting spin chains},
author = {Maurizio Fagotti},
journal= {arXiv preprint arXiv:1910.01046},
year = {2020}
}
Comments
42 pages, 2 figures (with numerical checks and an improved analysis of inhomogeneous Hamiltonians)