| Collective Modes of a Quasi-Two-Dimensional Superfluid Fermi Gas in BCS-BEC Crossover |
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| 引用本文： | 周昱 马晓栋 黄国翔. Collective Modes of a Quasi-Two-Dimensional Superfluid Fermi Gas in BCS-BEC Crossover[J]. 中国物理快报, 2006, 23(10): 2662-2665 |
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| 作者姓名： | 周昱 马晓栋 黄国翔 |
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| 作者单位： | [1]Department of Physics, East China Normal University, Shanghai 200062 [2]Department of Physics, Xinjiang Normal University, Ulrumchi 830054 |
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| 基金项目： | Supported by National Natural Science Foundation of China under Grant Nos 90403008 and 10434060. |
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| 摘 要： | We investigate the collective modes of a quasi-two-dimensional （Q2D） superfluid Fermi gas in Bardeen-Cooper-Schrieffer Bose-Einstein condensation （BCS-BEC） crossover. For solving a generalized Gross-Pitaevskii equation by using a time-dependent variational method, we take a trial wavefunction with the form of hybrid Gaussianparabolic type, which not only reflects the Q2D character of the system and also allows an essentially analytical approach of the problem. We present a Q2D criterion that is valid for various superfluid regimes and displays clearly the relation between the maximum condensed particle number and the parameters of trapping potential as well as atom-atom interaction. We show that due to the small particle number in the Q2D condensate, the contribution to oscillating frequencies by the quantum pressure in the strong confinement direction is significant and hence a Thomas-Fermi approximation can not be used.
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| 关 键 词： | 准二维超流体费尔米气体 交迭点 玻色子-爱因斯坦冷凝物 广义Gross-Pitaevskii方程 |
| 收稿时间： | 2006-05-09 |
| 修稿时间： | 2006-05-09 |
Collective Modes of a Quasi-Two-Dimensional Superfluid Fermi Gas in BCS-BEC Crossover |
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| ZHU Yu, MA Xiao-Dong, HUANG Guo-Xiang. Collective Modes of a Quasi-Two-Dimensional Superfluid Fermi Gas in BCS-BEC Crossover[J]. Chinese Physics Letters, 2006, 23(10): 2662-2665 |
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| Authors: | ZHU Yu MA Xiao-Dong HUANG Guo-Xiang |
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| Affiliation: | 1. Department of Physics, East China Normal University, Shanghai 200062;2.Department of Physics, Xinjiang Normal University, Ulrumchi 830054 |
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