Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose-Einstein Condensate in a Double Cavity  

作　　者：Bo-Hao Wu Xin-Xin Yang Yu Chen Wei Zhang 

机构地区：[1]Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices,Renmin University of China,Beijing 100872,China [2]Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education),Renmin University of China,Beijing 100872,China [3]Graduate School of China Academy of Engineering Physics,Beijing 100193,China [4]Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《Chinese Physics Letters》2024年第6期44-48,共5页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFA1405300);the National Natural Science Foundation of China(Grant Nos.11734010,12074428,12174358,and 92265208);NSAF(Grant No.U2330401)。

摘　　要：We study superradiant phase transitions in a hybrid system of a two-dimensional Bose–Einstein condensate of atoms and two cavities arranged with a tilt angle.By adjusting the loss rate of cavities,we map out the phase diagram of steady states within a mean field framework.It is found that when the loss rates of the two cavities are different,superradiant transitions may not occur at the same time in the two cavities.A first-order phase transition is observed between the states with only one cavity in superradiance and both in superradiance.In the case that both cavities are superradiant,a net photon current is observed flowing from the cavity with small decay rate to the one with large decay rate.The photon current shows a non-monotonic dependence on the loss rate difference,owing to the competition of photon number difference and cavity field phase difference.Our findings can be realized and detected in experiments.

关 键 词：EINSTEIN TRANSITIONS DECAY 

分 类 号：O469[理学—凝聚态物理]