Phase transition and multistability in Dicke dimer

TL;DR

This paper explores how photon hopping between two coupled Dicke cavities leads to diverse quantum phases and multistability, with analytical and numerical confirmation of steady states and phase control.

Contribution

It provides a comprehensive analytical and numerical analysis of steady states and phase transitions in a Dicke dimer system, highlighting photon hopping as a control mechanism.

Findings

Photon hopping induces rich quantum phases.

All steady states are analytically characterized.

Photon hopping enables multistability control.

Abstract

The exotic phase transitions and multistabilities in atom-cavity coupled systems have attracted tremendous interests recently. In this work, we investigate the effect of photon hopping between two Dicke cavities, which induces rich quantum phases for steady states and dynamic process. Starting from a generic dimer system where the two cavities are not necessarily identical, we analytically prove all possible steady-state phases, which are confirmed by numerical calculations. We then focus on the special case with two identical cavities, where all the steady states are confirmed by exact solutions. We show that photon hopping is a convenient and powerful tool to manipulate the quantum phases and induce multistable behavior in this system.