Excitation spectra of Bose-Einstein condensates in optical lattice

被引：4
|
作者：
Ichioka, M [1 ]
Machida, K [1 ]
机构：
[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2003年 / 72卷 / 09期
关键词：
Bose-Einstein condensates; optical lattice; excitation spectra; Bogoliubov theory;
D O I：
10.1143/JPSJ.72.2137
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The excitation spectra of Bose-Einstein condensates arc investigated in a three-dimensional optical lattice by the Bogoliubov theory considering the original sinusoidal potential for the optical lattice. When the lattice potential becomes high, the excitations show softening at large wavelengths, suggesting the breakdown of superfluidity. We also study the filling and interaction dependences of the properties of the excitation spectra and one-dimensional lattice case.
引用
收藏
页码：2137 / 2140
页数：4
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