Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice

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	Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice
	Y. Hu; Z. X. Liang; B. B. Hu
	2010
发表期刊	Physical Review A
ISSN	1050-2947
卷号	81 期号:5
摘要	We investigate the combined effects of weak disorder and a two-dimensional (2D) optical lattice on the collective excitations of a harmonically trapped Bose-Einstein condensate (BEC) at zero temperature. Accordingly, we generalize the hydrodynamic equations of superfluid for a weakly interacting Bose gas in a 2D optical lattice to include the effects of weak disorder. Our analytical results for the collective frequencies beyond the mean-field approximation reveal the peculiar role of disorder, interplaying with the 2D optical lattice and interatomic interaction, on elementary excitations along the 3D to 1D crossover. In particular, consequences of disorder on the phonon propagation and surface modes are analyzed in detail. The experimental scenario is also proposed.
部门归属	[hu, ying; hu, bambi] hong kong baptist univ, dept phys, ctr nonlinear studies, kowloon tong, hong kong, peoples r china. [hu, ying; hu, bambi] hong kong baptist univ, beijing hong kong singapore joint ctr nonlinear &, kowloon tong, hong kong, peoples r china. [liang, zhaoxin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [hu, bambi] univ houston, dept phys, houston, tx 77204 usa.;hu, y (reprint author), hong kong baptist univ, dept phys, ctr nonlinear studies, kowloon tong, hong kong, peoples r china;zhxliang@gmail.com
关键词	Elementary Excitations Ground-state Gas Spectrum
URL	查看原文
WOS记录号	WOS:000278140000151
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31163
专题	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. Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice[J]. Physical Review A,2010,81(5).
APA	Y. Hu,Z. X. Liang,&B. B. Hu.(2010).Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice.Physical Review A,81(5).
MLA	Y. Hu,et al."Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice".Physical Review A 81.5(2010).