$\mathcal{PT}$-Symmetry-Breaking Chaos in Optomechanics

TL;DR

This paper reports the discovery of $ ext{PT}$-symmetry-breaking chaos in optomechanical systems, characterized by ultralow driving thresholds and tunable chaos via system parameters, expanding the understanding of nonlinear dynamics in cavity optomechanics.

Contribution

It introduces the concept of $ ext{PT}$-symmetry-breaking chaos in optomechanics, demonstrating its emergence, control, and potential applications at ultralow power levels.

Findings

Chaos emerges with ultralow driving power

Chaos can be switched by tuning system parameters

Chaos onset time is inversely related to driving strength

Abstract

We demonstrate a $\mathcal{PT}$-symmetry-breaking chaos in optomechanical system (OMS), which features an ultralow driving threshold. In principle, this chaos will emerge once a driving laser is applied to the cavity mode and lasts for a period of time. The driving strength is inversely proportional to the starting time of chaos. This originally comes from the dynamical enhancement of nonlinearity by field localization in $\mathcal{PT}$-symmetry-breaking phase ($\mathcal{PT}$BP). Moreover, this chaos is switchable by tuning the system parameters so that a $\mathcal{PT}$-symmetry phase transition occurs. This work may fundamentally broaden the regimes of cavity optomechanics and nonlinear optics. It offers the prospect of exploring ultralow-power-laser triggered chaos and its potential applications in secret communication.