The Open-System Dicke-Model Quantum Phase Transition with a Sub-Ohmic Bath
Quantum Physics
2015-07-29 v1 Atomic Physics
Abstract
We show that the critical exponent of a quantum phase transition in a damped-driven open system is determined by the spectral density function of the reservoir. We consider the open-system variant of the Dicke model, where the driven boson mode and also the large N-spin couple to independent reservoirs at zero temperature. The critical exponent, which is if there is no spin-bath coupling, decreases below 1 when the spin couples to a sub-Ohmic reservoir.
Cite
@article{arxiv.1503.04672,
title = {The Open-System Dicke-Model Quantum Phase Transition with a Sub-Ohmic Bath},
author = {D. Nagy and P. Domokos},
journal= {arXiv preprint arXiv:1503.04672},
year = {2015}
}