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Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices
Lu, XC; Li, JB; Yu, Y; Lu, XC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
2006
发表期刊PHYSICAL REVIEW A
ISSN1050-2947
卷号73期号:4页码:-
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.
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
关键词Hubbard-model Einstein Condensation Phase-transition Superfluid Insulator Bosons Systems Atoms
学科领域Physics
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收录类别SCI
WOS记录号WOS:000237147700111
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/6007
专题1978-2010年知识产出
通讯作者Lu, XC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
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Lu, XC,Li, JB,Yu, Y,et al. Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices[J]. PHYSICAL REVIEW A,2006,73(4):-.
APA Lu, XC,Li, JB,Yu, Y,&Lu, XC , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.(2006).Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices.PHYSICAL REVIEW A,73(4),-.
MLA Lu, XC,et al."Slave-particle approach to the finite-temperature properties of ultracold Bose gases in optical lattices".PHYSICAL REVIEW A 73.4(2006):-.
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