Sound speed of a Bose-Einstein condensate in an optical lattice
文献类型：期刊论文
| 作者 | Z. X. Liang ; X. Dong ; Z. D. Zhang ; B. A. Wu |
| 刊名 | Physical Review A
 |
| 出版日期 | 2008 |
| 卷号 | 78期号:2 |
| 关键词 | feshbach resonances bloch bands atoms gas propagation transition dynamics velocity arrays |
| ISSN号 | 1050-2947 |
| 中文摘要 | The speed of sound of a Bose-Einstein condensate in an optical lattice is studied both analytically and numerically in all spatial three dimensions. Our investigation shows that the sound speed depends strongly on the strength of the lattice. In the one-dimensional case, the speed of sound falls monotonically with increasing lattice strength. The dependence on lattice strength becomes much richer in two and three dimensions. In the two-dimensional case, when the interaction is weak, the sound speed first increases and then decreases as the lattice strength increases. For the three-dimensional lattice, the sound speed can even oscillate with the lattice strength. These rich behaviors can be understood in terms of compressibility and effective mass. Our analytical results in the limit of weak lattices also offer an interesting perspective to help with our understanding: they show that the lattice component perpendicular to the sound propagation increases the sound speed while the lattice component parallel to the propagation decreases the sound speed. The various dependences of the sound speed on the lattice strength are the result of this competition. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32923]  |
| 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 | Z. X. Liang,X. Dong,Z. D. Zhang,et al. Sound speed of a Bose-Einstein condensate in an optical lattice[J]. Physical Review A,2008,78(2). |
| APA | Z. X. Liang,X. Dong,Z. D. Zhang,&B. A. Wu.(2008).Sound speed of a Bose-Einstein condensate in an optical lattice.Physical Review A,78(2). |
| MLA | Z. X. Liang,et al."Sound speed of a Bose-Einstein condensate in an optical lattice".Physical Review A 78.2(2008). |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。