Superlattice switching from parametric instabilities in a driven-dissipative BEC in a cavity

TL;DR

This paper investigates the complex phase behavior of a driven-dissipative Bose-Einstein condensate in an optical cavity, revealing a novel dynamical normal phase characterized by parametric resonance and switching between superradiant states.

Contribution

It introduces the discovery of a new nonequilibrium dynamical phase in a driven-dissipative BEC system, highlighting the breakdown of the Dicke model mapping and features of nonintegrability.

Findings

Identification of a third nonequilibrium phase as a manybody parametric resonance

Observation of switching between symmetry-broken superradiant configurations

Features of nonintegrability and thermalization in the dynamical normal phase

Abstract

We numerically obtain the full time-evolution of a parametrically-driven dissipative Bose-Einstein condensate in an optical cavity and investigate the implications of driving for the phase diagram. Beyond the normal and superradiant phases, a third nonequilibrium phase emerges as a manybody parametric resonance. This dynamical normal phase switches between two symmetry-broken superradiant configurations. The switching implies a breakdown of the system's mapping to the Dicke model. Unlike the other phases, the dynamical normal phase shows features of nonintegrability and thermalization.