Dissipative Dicke time crystals: an atoms' point of view
Abstract
We develop and study an atom-only description of the Dicke model with time-periodic couplings between atoms and a dissipative cavity mode. The cavity mode is eliminated giving rise to effective atom-atom interactions and dissipation. We use this effective description to analyze the dynamics of the atoms that undergo a transition to a dynamical superradiant phase with macroscopic coherences in the atomic medium and the light field. Using Floquet theory in combination with the atom-only description we provide a precise determination of the phase boundaries and of the dynamical response of the atoms. From this we can predict the existence of dissipative time crystals that show a subharmonic response with respect to the driving frequency. We show that the atom-only theory can describe the relaxation into such a dissipative time crystal and that the damping rate can be understood in terms of a cooling mechanism.
Keywords
Cite
@article{arxiv.2310.00046,
title = {Dissipative Dicke time crystals: an atoms' point of view},
author = {Simon B. Jäger and Jan Mathis Giesen and Imke Schneider and Sebastian Eggert},
journal= {arXiv preprint arXiv:2310.00046},
year = {2024}
}
Comments
13 pages with Supplemental Material and 6 figures. For more information and the latest version see https://www.physik.uni-kl.de/eggert/papers/