Phononic Josephson oscillation and self-trapping with two-phonon exchange interaction

Abstract

We propose a bosonic Josephson junction (BJJ) in two nonlinear mechanical resonator coupled through two-phonon exchange interaction induced by quadratic optomechanical couplings. The nonlinear dynamic equations and effective Hamiltonian are derived to describe behaviors of the BJJ. We show that the BJJ can work in two different dynamical regimes: Josephson oscillation and macroscopic self-trapping. The system can transfer from one regime to the other one when the self-interaction and asymmetric parameters exceed their critical values. We predict that a transition from Josephson oscillation to macroscopic self-trapping can be induced by the phonon damping in the asymmetric BJJs. Our results opens up a way to demonstrate BJJ with two-phonon exchange interaction and can be applied to other systems, such as the optical and microwave systems.

arXiv comment7 pages, 7 figures

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• Lasing and counter-lasing phase transitions in a cavity QED system
• Violation of the Leggett-Garg inequality for dynamics of a Bose-Einstein condensate in a double-well potential