We discuss the concept of local temperature for quantum systems driven out of equilibrium by ac pumps showing explicitly that it is the correct indicator for heat flow. We also show that its use allows for a generalization of the Wiedemann Franz law.
@article{arxiv.1102.4305,
title = {Local Temperatures and Heat Flow in Quantum Driven Systems},
author = {Alvaro Caso and Liliana Arrachea and Gustavo S. Lozano},
journal= {arXiv preprint arXiv:1102.4305},
year = {2011}
}