2023/02/25 by Stella Rolande Mbokop Tchounda, P. Djorwé, Tchounda, S. R. Mbokop +5
Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Mechanics and Non-Hermitian Physics #Quantum Physics (quant-ph) #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2302.13064
openalex publication_date 2023/02/25 · openalex created_date 2023/03/03 · openalex updated_date 2026/07/28
We study a dissipative, mechanically coupled optomechanical system that accommodates gain and loss. The gain (loss) is engineered by driven a purely dispersive optomechanical cavity with a blue-detuned (red-detuned) electromagnetic field. By taking into account the dissipative coupling, the Exceptional Point (EP), which is the PT-symmetry phase transition, occurs at low threshold driving strength compared to the purely dispersive system. In the linear regime, the PT-symmetry is unbroken and the dissipative coupling induces strong coupling between the mechanical resonators, leading to an increase in energy exchange. For sufficiently strong driving, the system enters into a nonlinear regime where the PT-symmetry is broken. In this regime, the mechanical resonators exhibit chaotic beats like-behaviour in the purely dispersive system. By switching on the dissipative coupling, the complex dynamics is switched off, restoring regular dynamics to the system. This work suggests ways to probe quantum phenomena in dissipative PT-symmetric systems at low-threshold driving strength. It also provides a new way to control complex dynamics in optomechanics and related fields.