期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep19751
关键词
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资金
- National Natural Science Foundation of China [11574022, 11174024]
- Open Fund of IPOC (BUPT) [IPOC2013B007]
- Open Project Program of State Key Laboratory of Low-Dimensional Quantum Physics (Tsinghua University) [KF201407]
- Beijing Higher Education (Young Elite Teacher Project) [YETP 1141]
The biased Dicke model describes a system of biased two-level atoms coupled to a bosonic field, and is expected to produce new phenomena that are not present in the original Dicke model. In this paper, we study the critical properties of the biased Dicke model in the classical oscillator limits. For the finite-biased case in this limit, We present analytical results demonstrating that the excitation energy does not vanish for arbitrary coupling. This indicates that the second order phase transition is avoided in the biased Dicke model, which contrasts to the original Dicke model. We also analyze the squeezing and the entanglement in the ground state, and find that a finite bias will strongly modify their behaviors in the vicinity of the critical coupling point.
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