Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density
文献类型：期刊论文
| 作者 | K. Z. Zhou ; Y. Hu ; Z. X. Liang ; Z. D. Zhang |
| 刊名 | Physical Review A
 |
| 出版日期 | 2010 |
| 卷号 | 82期号:4 |
| 关键词 | long-range order continuous symmetry group 2-dimensional systems einstein condensation mott insulator 2 dimensions bosons destruction transition lattices |
| ISSN号 | 1050-2947 |
| 中文摘要 | We investigate a dilute Bose gas confined in a tight one-dimensional (1D) optical lattice plus a superimposed random potential at zero temperature. Accordingly, the ground-state energy, quantum depletion, and superfluid density are calculated. The presence of the lattice introduces a crossover to the quasi-two-dimensional (2D) regime, where we analyze asymptotically the 2D behavior of the system, particularly the effects of disorder. We thereby offer an analytical expression for the ground-state energy of a purely 2D Bose gas in a random potential. The obtained disorder-induced normal fluid density n(n) and quantum depletion n(d) both exhibit a characteristic 1/1n(1/n(2D)a(2D)(2)) dependence. Their ratio n(n)/n(d) increases to 2 compared to the familiar 4/3 in lattice-free three-dimensional (3D) geometry, signifying a more pronounced contrast between superfluidity and Bose-Einstein condensation in low dimensions. The conditions for possible experimental realization of our scenario are also proposed. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31777]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | K. Z. Zhou,Y. Hu,Z. X. Liang,et al. Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density[J]. Physical Review A,2010,82(4). |
| APA | K. Z. Zhou,Y. Hu,Z. X. Liang,&Z. D. Zhang.(2010).Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density.Physical Review A,82(4). |
| MLA | K. Z. Zhou,et al."Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density".Physical Review A 82.4(2010). |
入库方式： OAI收割
来源：金属研究所
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