Bogoliubov sound speed in periodically modulated Bose-Einstein condensates
Bogoliubov sound speed in periodically modulated Bose-Einstein condensates
复制标题
周期性调制玻色-爱因斯坦凝聚体中的博戈柳博夫声速
DOI：
10.1103/physreva.68.053611
复制
发表时间：
2003
影响因子：
2.9
通讯作者：
E. Zaremba
中科院分区：
文献类型：
--
作者：
E. Taylor;E. Zaremba
本文研究了任意空间尺度的光晶格中玻色凝聚气体的玻色流波夫激发。主要的兴趣是长波长的声子色散的电流和载流的凝聚体。我们得到的声子声速进行系统的展开的Bogoliubov方程的幂的声子波矢。我们的结果与最近通过流体动力学理论得到的结果一致。
We study the Bogoliubov excitations of a Bose-condensed gas in an optical lattice having arbitrary spatial dimensions. Of primary interest is the long-wavelength phonon dispersion for both current-free and current-carrying condensates. We obtain the phonon sound speed by carrying out a systematic expansion of the Bogoliubov equations in powers of the phonon wave vector. Our result for the current-carrying case agrees with the one recently obtained by means of a hydrodynamic theory.