Zhao Xiuqin, Liu Ni, Liang J-Q
Opt Express. 2017 Apr 3;25(7):8123-8137. doi: 10.1364/OE.25.008123.
In this paper we investigate the ground-state properties and related quantum phase transitions for the two-component Bose-Einstein condensate in a single-mode optical cavity. Apart from the usual normal and superradiant phases, multi-stable macroscopic quantum states are realized by means of the spin-coherent-state variational method. We demonstrate analytically the stimulated radiation from a collective state of atomic population inversion, which does not exist in the normal Dicke model with single-component atoms. It is also revealed that the stimulated radiation can be generated only from one component of atoms and the other remains in the ordinary superradiant state. However, the order of superradiant and stimulated-radiation states is interchangeable between two components of atoms by tuning the relative atom-field couplings and the frequency detuning as well.
在本文中，我们研究了单模光学腔中两分量玻色 - 爱因斯坦凝聚体的基态性质及相关量子相变。除了通常的正常相和超辐射相之外，通过自旋相干态变分方法实现了多稳态宏观量子态。我们通过解析证明了原子布居反转集体态产生的受激辐射，这在单分量原子的普通迪克模型中是不存在的。还揭示出受激辐射只能由原子的一个分量产生，而另一个分量则保持在普通超辐射态。然而，通过调节相对原子 - 场耦合以及频率失谐，超辐射态和受激辐射态的顺序在原子的两个分量之间也是可以互换的。
