Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice

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	Effects of disorder on quantum fluctuations and superfluid density of a Bose-Einstein condensate in a two-dimensional optical lattice
	Y. Hu; Z. X. Liang; B. B. Hu
	2009
发表期刊	Physical Review A
ISSN	1050-2947
卷号	80 期号:4
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.
部门归属	[hu, ying; liang, zhaoxin; hu, bambi] hong kong baptist univ, dept phys, ctr nonlinear studies, kowloon tong, hong kong, peoples r china. [hu, ying; liang, zhaoxin; 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, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [hu, bambi] univ houston, dept phys, houston, tx 77204 usa.;liang, zx (reprint author), hong kong baptist univ, dept phys, ctr nonlinear studies, kowloon tong, hong kong, peoples r china;zhxliang@gmail.com
关键词	Bose-einstein Condensation Ground States Optical Lattices Superfluidity Ground-state Anderson Localization Excitation Spectrum Gas Bosons System
URL	查看原文
WOS记录号	WOS:000271351000156
引用统计	被引频次：16[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/321006/31972
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. 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).