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Quantum Effects of Uniform Bose Atomic Gases with Weak Attraction |
| CHENG Ze**
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School of Physics, Huazhong University of Science and Technology, Wuhan 430074
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| Cite this article: |
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CHENG Ze 2011 Chin. Phys. Lett. 28 050306 |
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Abstract We find that uniform Bose atomic gases with weak attraction can undergo a Bardeen–Cooper–Schrieffer (BCS) condensation below a critical temperature. In the BCS condensation state, bare atoms with opposite wave vectors are bound into pairs, and unpaired bare atoms are transformed into a new kind of quasi-particles, i.e. the dressed atoms. The atom-pair system is a condensate or a superfluid and the dressed-atom system is a normal fluid. The critical temperature and the effective mass of dressed atoms are derived analytically. The transition from the BCS condensation state to the normal state is a first-order phase transition.
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| Keywords:
03.75.Kk
05.30.Jp
64.60.-i
67.85.De
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Received: 15 July 2010
Published: 26 April 2011
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| PACS: |
03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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05.30.Jp
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(Boson systems)
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64.60.-i
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(General studies of phase transitions)
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67.85.De
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(Dynamic properties of condensates; excitations, and superfluid flow)
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