Sound speed of a Bose-Einstein condensate in an optical lattice

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	Sound speed of a Bose-Einstein condensate in an optical lattice
	Z. X. Liang; X. Dong; Z. D. Zhang; B. A. Wu
	2008
发表期刊	Physical Review A
ISSN	1050-2947
卷号	78 期号:2
摘要	The speed of sound of a Bose-Einstein condensate in an optical lattice is studied both analytically and numerically in all spatial three dimensions. Our investigation shows that the sound speed depends strongly on the strength of the lattice. In the one-dimensional case, the speed of sound falls monotonically with increasing lattice strength. The dependence on lattice strength becomes much richer in two and three dimensions. In the two-dimensional case, when the interaction is weak, the sound speed first increases and then decreases as the lattice strength increases. For the three-dimensional lattice, the sound speed can even oscillate with the lattice strength. These rich behaviors can be understood in terms of compressibility and effective mass. Our analytical results in the limit of weak lattices also offer an interesting perspective to help with our understanding: they show that the lattice component perpendicular to the sound propagation increases the sound speed while the lattice component parallel to the propagation decreases the sound speed. The various dependences of the sound speed on the lattice strength are the result of this competition.
部门归属	[liang, z. x.; dong, xi; wu, biao] chinese acad sci, inst phys, beijing 100080, peoples r china. [liang, z. x.; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [liang, z. x.; zhang, z. d.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [dong, xi] tsinghua univ, dept phys, beijing 10084, peoples r china.;liang, zx (reprint author), chinese acad sci, inst phys, pob 603, beijing 100080, peoples r china
关键词	Feshbach Resonances Bloch Bands Atoms Gas Propagation Transition Dynamics Velocity Arrays
URL	查看原文
WOS记录号	WOS:000259263500037
引用统计	被引频次：33[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/321006/32923
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. X. Liang,X. Dong,Z. D. Zhang,et al. Sound speed of a Bose-Einstein condensate in an optical lattice[J]. Physical Review A,2008,78(2).
APA	Z. X. Liang,X. Dong,Z. D. Zhang,&B. A. Wu.(2008).Sound speed of a Bose-Einstein condensate in an optical lattice.Physical Review A,78(2).
MLA	Z. X. Liang,et al."Sound speed of a Bose-Einstein condensate in an optical lattice".Physical Review A 78.2(2008).