Eigenstate thermalization within isolated spin-chain systems
Abstract
The thermalization phenomenon and many-body quantum statistical properties are studied on the example of several observables in isolated spin-chain systems, both integrable and generic non-integrable ones. While diagonal matrix elements for non-integrable models comply with the eigenstate thermalization hypothesis (ETH), the integrable systems show evident deviations and similarity to properties of noninteracting many-fermion models. The finite-size scaling reveals that the crossover between two regimes is given by a scale closely related to the scattering length. Low-frequency off-diagonal matrix elements related to d.c. transport quantities in a generic system also follow the behavior analogous to the ETH, however unrelated to the one of diagonal elements.
Keywords
Cite
@article{arxiv.1208.6143,
title = {Eigenstate thermalization within isolated spin-chain systems},
author = {Robin Steinigeweg and Jacek Herbrych and Peter Prelovšek},
journal= {arXiv preprint arXiv:1208.6143},
year = {2013}
}