期刊
PHYSICAL REVIEW A
卷 86, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.053605
关键词
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资金
- National Natural Science Foundation of China [10735010, 10975072, 11035001, 11120101005]
- 973 National Major State Basic Research and Development of China [2007CB815004, 2010CB327803]
- CAS [KJCX2-SW-N02]
- Research Fund of Doctoral Point (RFDP) [20100091110028]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
We propose that the evolution of superfluidity from the Bardeen-Cooper-Schrieffer (BCS) regime to the Bose-Einstein condensation (BEC) regime can be realized using ultracold Fermi gas coupled to a single-mode cavity. By the functional integral formalism, we derive an effective atom-only action, which mimics the two-component Fermi gas with tunable two-body interaction. First, we address the features of the cavity-mediated interaction. We find that the matter-light coupling creates an effective s-wave scattering whose sign and amplitude are controlled by parameters of the cavity. Second, we discuss the fermionic superfluidity on the mean-field level, including the order parameter, chemical potential, quasiparticle excitation spectrum, momentum distribution, and dissociation temperature. It is shown that by varying the atom-cavity detuning, a BCS to BEC crossover occurs. In addition, the influences of the atomic collaborative effect and external pumping field on the pairing correlation are also studied.
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