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题名: Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices
作者: Lu, XC ;  Li, JB ;  Yu, Y
刊名: PHYSICAL REVIEW A
出版日期: 2006
卷号: 73, 期号:4, 页码:-
关键词: HUBBARD-MODEL ;  EINSTEIN CONDENSATION ;  PHASE-TRANSITION ;  SUPERFLUID ;  INSULATOR ;  BOSONS ;  SYSTEMS ;  ATOMS
学科分类: Physics
通讯作者: Lu, XC , 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; Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
英文摘要: By using slave particle (slave boson and slave fermion) techniques on the Bose-Hubbard model, we study the finite temperature properties of ultracold Bose gases in optical lattices. The phase diagrams at finite temperature are depicted by including different types of slave particles and the effect of the finite types of slave particles is estimated. The superfluid density is evaluated using the Landau second order phase transition theory. The atom density, excitation spectrum, and dispersion curve are also computed at various temperatures, and how the Mott-insulator evolves as the temperature increases is demonstrated. For most quantities to be calculated, we find that there are no qualitative differences in using the slave boson or the slave fermion approaches. However, when studying the stability of the mean field state, we find that in contrast to the slave fermion approach, the slave boson mean field state is not stable. Although the slave boson mean field theory gives a qualitatively correct phase boundary, it corresponds to a local maximum of Landau free energy and cannot describe the second order phase transition because the coefficient a(4) of the fourth order term is always negative in the free energy expansion.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000237147700111
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/6007
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Lu, XC,Li, JB,Yu, Y. Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices[J]. PHYSICAL REVIEW A,2006,73(4):-.
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