期刊
EUROPEAN PHYSICAL JOURNAL D
卷 58, 期 3, 页码 379-384出版社
SPRINGER
DOI: 10.1140/epjd/e2010-00126-4
关键词
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资金
- RGC of Hong Kong [HKU7051/06P, HKU7044/08P]
- URC fund of HKU
- State Key Program for Basic Research of China [2006CB921800]
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 Delta-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.
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