Cavity QED of Strongly Correlated Electron Systems: A No-go Theorem for Photon Condensation
Mesoscale and Nanoscale Physics
2019-09-25 v3 Strongly Correlated Electrons
Quantum Physics
Abstract
In spite of decades of work it has remained unclear whether or not superradiant quantum phases, referred to here as photon condensates, can occur in equilibrium. In this Letter, we first show that when a non-relativistic quantum many-body system is coupled to a cavity field, gauge invariance forbids photon condensation. We then present a microscopic theory of the cavity quantum electrodynamics of an extended Falicov-Kimball model, showing that, in agreement with the general theorem, its insulating ferroelectric and exciton condensate phases are not altered by the cavity and do not support photon condensation.
Keywords
Cite
@article{arxiv.1905.11227,
title = {Cavity QED of Strongly Correlated Electron Systems: A No-go Theorem for Photon Condensation},
author = {G. M. Andolina and F. M. D. Pellegrino and V. Giovannetti and A. H. MacDonald and M. Polini},
journal= {arXiv preprint arXiv:1905.11227},
year = {2019}
}
Comments
Reference list updated and minor typos corrected