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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
Source PublicationChinese Physics Letters
ISSN0256-307X
Volume31Issue:3
AbstractWith 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.
description.department[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
KeywordOptical Lattices Mott Insulator Gases
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72948
Collection中国科学院金属研究所
Recommended Citation
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).
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