Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density

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	Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density
	K. Z. Zhou; Y. Hu; Z. X. Liang; Z. D. Zhang
	2010
发表期刊	Physical Review A
ISSN	1050-2947
卷号	82 期号:4
摘要	We investigate a dilute Bose gas confined in a tight one-dimensional (1D) optical lattice plus a superimposed random potential at zero temperature. Accordingly, the ground-state energy, quantum depletion, and superfluid density are calculated. The presence of the lattice introduces a crossover to the quasi-two-dimensional (2D) regime, where we analyze asymptotically the 2D behavior of the system, particularly the effects of disorder. We thereby offer an analytical expression for the ground-state energy of a purely 2D Bose gas in a random potential. The obtained disorder-induced normal fluid density n(n) and quantum depletion n(d) both exhibit a characteristic 1/1n(1/n(2D)a(2D)(2)) dependence. Their ratio n(n)/n(d) increases to 2 compared to the familiar 4/3 in lattice-free three-dimensional (3D) geometry, signifying a more pronounced contrast between superfluidity and Bose-Einstein condensation in low dimensions. The conditions for possible experimental realization of our scenario are also proposed.
部门归属	[zhou, kezhao; liang, zhaoxin; zhang, zhidong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [zhou, kezhao; liang, zhaoxin; zhang, zhidong] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [hu, ying] hong kong baptist univ, ctr nonlinear studies, dept phys, kowloon tong, hong kong, peoples r china. [hu, ying] hong kong baptist univ, beijing hong kong singapore joint ctr nonlinear &, kowloon tong, hong kong, peoples r china.;zhou, kz (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;zhxliang@gmail.com
关键词	Long-range Order Continuous Symmetry Group 2-dimensional Systems Einstein Condensation Mott Insulator 2 Dimensions Bosons Destruction Transition Lattices
URL	查看原文
WOS记录号	WOS:000283044400006
引用统计	被引频次：4[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/321006/31777
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Z. Zhou,Y. Hu,Z. X. Liang,et al. Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density[J]. Physical Review A,2010,82(4).
APA	K. Z. Zhou,Y. Hu,Z. X. Liang,&Z. D. Zhang.(2010).Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density.Physical Review A,82(4).
MLA	K. Z. Zhou,et al."Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density".Physical Review A 82.4(2010).