Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice
文献类型：期刊论文
| 作者 | Y. Hu ; Z. X. Liang ; B. B. Hu |
| 刊名 | Physical Review A
 |
| 出版日期 | 2009 |
| 卷号 | 80期号:4 |
| 关键词 | Bose-Einstein condensation ground states optical lattices superfluidity ground-state anderson localization excitation spectrum gas bosons system |
| ISSN号 | 1050-2947 |
| 中文摘要 | We investigate a Bose-Einstein condensate (BEC) trapped in a two-dimensional optical lattice in the presence of weak disorder within the framework of the Bogoliubov theory. In particular, we analyze the combined effects of disorder and an optical lattice on quantum fluctuations and superfluid density of the BEC system. Accordingly, the analytical expressions of the ground-state energy and quantum depletion of the system are obtained. Our results show that the lattice still induces a characteristic three-dimensional (3D) to one-dimensional crossover in the behavior of quantum fluctuations, despite the presence of weak disorder. Furthermore, we use the linear response theory to calculate the normal fluid density of the condensate induced by disorder. Our results in the 3D regime show that the combined presence of disorder and lattice induce a normal fluid density that asymptotically approaches 4/3 of the corresponding condensate depletion. 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/321006/31972]  |
| 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 | Y. Hu,Z. X. Liang,B. B. Hu. Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice[J]. Physical Review A,2009,80(4). |
| APA | Y. Hu,Z. X. Liang,&B. B. Hu.(2009).Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice.Physical Review A,80(4). |
| MLA | Y. Hu,et al."Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice".Physical Review A 80.4(2009). |
入库方式： OAI收割
来源：金属研究所
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