Superradiant Switching, Quantum Hysteresis, and Oscillations in a Generalized Dicke Model

TL;DR

This paper explores quantum signatures of nonlinear dynamics in a generalized Dicke model, revealing phase coexistence, hysteresis, and oscillations driven by quantum fluctuations.

Contribution

It demonstrates the emergence of superradiant switching, hysteresis, and oscillatory phases in a quantum Dicke model with asymmetric light-matter coupling.

Findings

First-order phase transition with phase coexistence

Quantum hysteresis loop observed in the system

Transition to a superradiant oscillatory phase

Abstract

We demonstrate quantum signatures of deterministic nonlinear dynamics in the transition to superradiance of a generalized open Dicke model with different coupling strengths for the co- and counter-rotating light-matter interaction terms. A first-order phase transition to coexisting normal and superradiant phases is observed, corresponding with the emergence of switching dynamics between these two phases, driven by quantum fluctuations. We show that this phase coexistence gives rise to a hysteresis loop also for the quantum mechanical system. Additionally, a transition to a superradiant oscillatory phase can be observed clearly in quantum simulations.