Collective Excitation and Quantum Depletion of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells

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	Collective Excitation and Quantum Depletion of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells
	R. Xue; W. D. Li; Z. X. Liang
	2014
发表期刊	Chinese Physics Letters
ISSN	0256-307X
卷号	31 期号:3
摘要	With the help of a set of exact closed-form solutions to the stationary Gross-Pitaevskii (GP) equation, we calculate the collective excitation and quantum depletion of a weakly interacting Bose gas in the presence of a periodic array of quantum wells. The excitation spectrum (Bogoliubov spectrum) is obtained from the solution of the linearized time-dependent GP equation, which develops energy bands (h) over barw(j)(p) periodic in quasi-momentum space. Moreover, we calculate the excitation strengths Z(j)(p) relative to the density operator and then the dynamic structure factor S(p,w). Accordingly, the analytical expressions of quantum depletion of the system are obtained. We find that the quantum depletion is enhanced when the interatomic interactions become larger and the potential is sufficiently deep. The conditions for the possible experimental realization of our scenario are also proposed.
部门归属	[xue rui] north univ china, key lab instrumentat sci & dynam measurement, taiyuan 030051, peoples r china. [xue rui] north univ china, natl key lab elect measurement technol, taiyuan 030051, peoples r china. [xue rui] north univ china, dept phys, taiyuan 030051, peoples r china. [xue rui] north univ china, engn technol res ctr shanxi prov optoelect inform, taiyuan 030051, peoples r china. [li wei-dong] shanxi univ, inst theoret phys, taiyuan 030006, peoples r china. [li wei-dong] shanxi univ, dept phys, taiyuan 030006, peoples r china. [liang zhao-xin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; liang, zx (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhxliang@gmail.com
关键词	Optical Lattices Mott Insulator Gases
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72948
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. Xue,W. D. Li,Z. X. Liang. Collective Excitation and Quantum Depletion of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells[J]. Chinese Physics Letters,2014,31(3).
APA	R. Xue,W. D. Li,&Z. X. Liang.(2014).Collective Excitation and Quantum Depletion of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells.Chinese Physics Letters,31(3).
MLA	R. Xue,et al."Collective Excitation and Quantum Depletion of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells".Chinese Physics Letters 31.3(2014).