Dynamical phase transition in the open Dicke model
Abstract
The Dicke model with a weak dissipation channel is realized by coupling a Bose-Einstein condensate to an optical cavity with ultra-narrow bandwidth. We explore the dynamical critical properties of the Hepp-Lieb-Dicke phase transition by performing quenches across the phase boundary. We observe hysteresis in the transition between a homogeneous phase and a self-organized collective phase with an enclosed loop area showing power law scaling with respect to the quench time, which suggests an interpretation within a general framework introduced by Kibble and Zurek. The observed hysteretic dynamics is well reproduced by numerically solving the mean field equation derived from a generalized Dicke Hamiltonian. Our work promotes the understanding of nonequilibrium physics in open many-body systems with infinite range interactions.
Cite
@article{arxiv.1409.1945,
title = {Dynamical phase transition in the open Dicke model},
author = {J. Klinder and H. Keßler and M. Wolke and L. Mathey and A. Hemmerich},
journal= {arXiv preprint arXiv:1409.1945},
year = {2015}
}
Comments
10 pages, 4 figures. Main text & Supplement; PNAS 2015. arXiv admin note: text overlap with arXiv:1407.4954