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题名: Lower bound for the hyperfine populations of spin-2 condensates against a magnetic field under the single-spatial-mode approximation
作者: Liu, YM;  He, YZ;  Bao, CG
刊名: PHYSICAL REVIEW A
出版日期: 2015
卷号: 92, 期号:6, 页码:63631
学科分类: Optics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevA.92.063631
通讯作者: Bao, CG (reprint author), Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China.
文章类型: Article
英文摘要: The variation of the hyperfine populations N rho(mu) of the ground state (g.s.) of spin-2 condensates against a magnetic field B is studied. A N-body theory which is rigorous in dealing with the spin degrees of freedom has been adopted. The conservation of the total magnetization M is assumed. A combined hyperfine population N rho(comb) = N(rho(0) - 3 rho(2) - 3 rho(-2)), which is an observable, is defined. The lower bound for this population has been derived analytically. It turns out that the lower bound is identical to the actual population when B = 0 and 8, and the population is monotonically uprising in between. Thus, via the analytical form of the lower bound, the variation of the population against B can be roughly known in advance. Numerical examples are given to demonstrate the applicability of the bound. When M = 0, the g.s. in the polar phase was found to be highly unstable against B because the neighboring level density is extremely high. When M = N, the g.s. in the cyclic phase was also found to be highly unstable. This is because the appearance of B, even if it is very weak, will break the high degeneracy of the g.s. and result in having numerous levels emerging in the neighborhood of the g.s.
类目[WOS]: Optics ;  Physics, Atomic, Molecular & Chemical
关键词[WOS]: GROUND-STATE ;  BOSE ;  DYNAMICS ;  GASES
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11372122] ;  Open Project Program of State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20737
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Liu, YM,He, YZ,Bao, CG. Lower bound for the hyperfine populations of spin-2 condensates against a magnetic field under the single-spatial-mode approximation[J]. PHYSICAL REVIEW A,2015,92(6):63631.
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