Metastable state and macroscopic quantum tunneling of binary mixtures

摘要

We provide a mixing model to explore the metastable state and the macroscopic quantum tunnel_ing (MQT) of binary mixtures. For 912 > g~(1/lg2), we first observe the two condensates form the symmetry-breaking state (SBS) and then suddenly transfer to the symmetry-preserving state (SPS) through the MQT. The SBS is shown to be the metastable state in our system. We find the MQT does not sponta_neously arise. The inducement mechanism is the damping but not the excitations. The damping mechanism can also control the lifetime and the tunneling decay rate of the SBS. Finally, we further present the origin of these phenomena by examining the energy of the system.