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题名: Spin-quadrupole ordering of spin-3/2 ultracold fermionic atoms in optical lattices in the one-band Hubbard model
作者: Tu, Hong-Hao ;  Zhang, Guang-Ming ;  Yu, Lu
刊名: PHYSICAL REVIEW B
出版日期: 2006
卷号: 74, 期号:17, 页码:-
关键词: PATH-INTEGRAL APPROACH ;  ARBITRARY SPIN ;  SYSTEMS ;  CONDENSATE ;  SYMMETRY ;  GASES
学科分类: Physics
通讯作者: Zhang, GM , Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
部门归属: Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: Based on a generalized one-band Hubbard model, we study magnetic properties of Mott insulating states for ultracold spin-3/2 fermionic atoms in optical lattices. When the s-wave scattering lengths for the total spin S=2,0 satisfy conditions a(2)> a(0)> 0, we apply a functional integral approach to the half filled case, where the spin-quadrupole fluctuations dominate. On a two-dimensional square lattice, the saddle-point solution yields a staggered spin-quadrupole ordering at zero temperature with symmetry breaking from SO(5) to SO(4). Both spin and spin-quadrupole static structure factors are calculated, displaying highly anisotropic spin antiferromagnetic fluctuations and antiferroquadrupole long-range correlations, respectively. When Gaussian fluctuations around the saddle point are taken into account, spin-quadrupole density waves with a linear dispersion are derived. Compared with the spin-density waves in the half filled spin-1/2 Hubbard model, the quadrupole density wave velocity is saturated in the strong-coupling limit, and there are no transverse spin-quadrupole mode couplings, as required by the SO(4) invariance of the effective action. Finally, in the strong-coupling limit of the model Hamiltonian, we derive the effective hyperfine spin-exchange interactions for the Mott insulating phases in the quarter filled and half filled cases, respectively.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000242409000075
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内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5862
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Tu, Hong-Hao,Zhang, Guang-Ming,Yu, Lu. Spin-quadrupole ordering of spin-3/2 ultracold fermionic atoms in optical lattices in the one-band Hubbard model[J]. PHYSICAL REVIEW B,2006,74(17):-.
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