Fluctuation-Induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity
Abstract
We investigate the steady state phase diagram of fermionic atoms subjected to an optical lattice and coupled to a high finesse optical cavity with photon losses. The coupling between the atoms and the cavity field is induced by a transverse pump beam. Taking fluctuations around the mean-field solutions into account, we find that a transition to a self-organized phase takes place at a critical value of the pump strength. In the self-organized phase the cavity field takes a finite expectation value and the atoms show a modulation in the density. Surprisingly, at even larger pump strengths two self-organized stable solutions of the cavity field and the atoms occur, signaling the presence of a bistability. We show that the bistable behavior is induced by the atoms-cavity fluctuations and is not captured by the mean-field approach.
Cite
@article{arxiv.2409.16035,
title = {Fluctuation-Induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity},
author = {Luisa Tolle and Ameneh Sheikhan and Thierry Giamarchi and Corinna Kollath and Catalin-Mihai Halati},
journal= {arXiv preprint arXiv:2409.16035},
year = {2025}
}