单杂质诱导的腔玻色-爱因斯坦凝聚中的狄克量子相变。
Single-impurity-induced Dicke quantum phase transition in a cavity-Bose-Einstein condensate.
机构信息
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China.
College of Physics and Electronic Information Science, Hunan Provincial Key Laboratory of Intelligent Information Processing and Application, Hengyang Normal University, Hengyang, 4210002, China.
出版信息
Sci Rep. 2017 Aug 7;7(1):7404. doi: 10.1038/s41598-017-07899-x.
We present a new generalized Dicke model, an impurity-doped Dicke model (IDDM), by the use of an impurity-doped cavity-Bose-Einstein condensate (BEC). It is shown that the impurity atom can induce Dicke quantum phase transition (QPT) from the normal phase to superradiant phase at a critic value of the impurity population. It is found that the impurity-induced Dicke QPT can happen in an arbitrary field-atom coupling regime while the Dicke QPT in the standard Dicke model occurs only in the strong coupling regime of the cavity field and atoms. This opens the possibility to realize the control of quantum properties of a macroscopic-quantum system (BEC) by using a microscopic quantum system (a single impurity atom).
我们提出了一个新的广义狄克模型，即通过掺杂杂质的腔-玻色-爱因斯坦凝聚（BEC）实现的掺杂杂质的狄克模型（IDDM）。结果表明，在杂质浓度达到临界值时，杂质原子可以诱导狄克量子相变（QPT），使系统从正常相转变为超辐射相。我们发现，杂质诱导的狄克 QPT 可以在任意的场-原子耦合条件下发生，而标准狄克模型中的狄克 QPT 仅在腔场和原子的强耦合条件下发生。这为通过微观量子系统（单个杂质原子）来控制宏观量子系统（BEC）的量子性质提供了可能性。
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