Energy spread and current-current correlation in quantum systems
arXiv:1407.7197 · doi:10.1140/epjb/e2014-50797-4
Abstract
We consider energy (heat) transport in quantum systems, and establish a relationship between energy spread and energy current-current correlation function. The energy current-current correlation is related to thermal conductivity by the Green-Kubo formula, and thus this relationship allows us to study conductivity directly from the energy spread process. As an example, we investigate a spinless fermion model; the numerical results confirm the relationship.
5 pages, 2 figures