Extended JC-Dicke model for two-component atomic BEC inside a cavity
Extended JC-Dicke model for two-component atomic BEC inside a cavity
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DOI：
10.1140/epjd/e2010-00126-4
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发表时间：
2009-04
期刊：
影响因子：
--
通讯作者：
Yong Li;Peng Zhang;Z. Wang
中科院分区：
文献类型：
--
作者：
Yong Li;Peng Zhang;Z. Wang
研究了一个被囚禁的双组分原子玻色-爱因斯坦凝聚体（BEC），其中每个原子有三个能级，分别与一个光腔场、一个外经典光场和一个微波场耦合，形成所谓的Δ型结构.在消隐原子激发态后，在行波近似下导出了一个扩展的JC Dicke模型。在平均场方法的框架下，研究了该模型哈密顿量的标度基态能量和相图。当微波场的振幅改变其符号时，揭示了一种新的相变。
We consider a trapped two-component atomic Bose-Einstein condensate (BEC), where each atom with three energy-levels is coupled to an optical cavity field and an external classical optical field as well as a microwave field to form the so-called Δ-type configuration. After adiabatically eliminating the atomic excited state, an extended JC-Dicke model is derived under the rotating-wave approximation. The scaled ground-state energy and the phase diagram of this model Hamiltonian are investigated in the framework of mean-field approach. A new phase transition is revealed when the amplitude of microwave field changes its sign.