Non-zero entropy density in the XY chain out of equilibrium
Mathematical Physics
2007-05-23 v2 math.MP
Abstract
The von Neumann entropy density of a block of n spins is proved to be non-zero for large n in the non-equilibrium steady state of the XY chain constructed by coupling a finite cutout of the chain to the two infinite parts to its left and right which act as thermal reservoirs at different temperatures. Moreover, the non-equilibrium density is shown to be strictly greater than the density in thermal equilibrium.
Keywords
Cite
@article{arxiv.math-ph/0603049,
title = {Non-zero entropy density in the XY chain out of equilibrium},
author = {Walter H. Aschbacher},
journal= {arXiv preprint arXiv:math-ph/0603049},
year = {2007}
}