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题名: Phase diagram of ultracold atoms in optical lattices: Comparative study of slave fermion and slave boson approaches to Bose-Hubbard model
作者: Yu, Y ;  Chui, ST
刊名: PHYSICAL REVIEW A
出版日期: 2005
卷号: 71, 期号:3, 页码:-
关键词: ANDERSON MODEL ;  TRANSITION ;  SUPERFLUID ;  INSULATOR
学科分类: Physics
通讯作者: Yu, Y , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
英文摘要: We perform a comparative study of the finite temperature behavior of ultracold Bose atoms in optical lattices by the slave fermion and the slave boson approaches to the Bose-Hubbard model. The phase diagram of the system is presented. Although both approaches are equivalent without approximations, the mean field theory based on the slave fermion technique is quantitatively more appropriate. Conceptually, the slave fermion approach automatically excludes the double occupancy of two identical fermions on the same lattice site. By comparing to known results in limiting cases, we find the slave fermion approach better than the slave boson approach. For example, in the non-interacting limit, the critical temperature of the superfluid-normal liquid transition calculated by the slave fermion approach is closer to the well-known ideal Bose gas result. At zero-temperature limit of the critical interaction, strength from the slave fermion approach is also closer to that from the direct calculation using a zero-temperature mean field theory.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000228632400032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13869
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Yu, Y,Chui, ST. Phase diagram of ultracold atoms in optical lattices: Comparative study of slave fermion and slave boson approaches to Bose-Hubbard model[J]. PHYSICAL REVIEW A,2005,71(3):-.
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