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题名: Gapped spin-liquid states in a one-dimensional Hubbard model with antiferromagnetic exchange interaction
作者: Dai, JH ;  Feng, XY ;  Xiang, T ;  Yu, Y
刊名: PHYSICAL REVIEW B
出版日期: 2004
卷号: 70, 期号:6, 页码:-
关键词: MATRIX RENORMALIZATION-GROUP ;  T-J MODEL ;  PHASE-DIAGRAM ;  SUPERCONDUCTIVITY ;  TRANSITION ;  SYSTEMS ;  LATTICE ;  WAVES ;  CHAIN
学科分类: Physics
通讯作者: Dai, JH , Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China.
部门归属: Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China
英文摘要: We study the phase diagram of a one-dimensional extended Hubbard model with antiferromagnetic exchange interaction analytically and numerically. The bosonization and transfer-matrix renormalization group methods are used in the corresponding coupling regimes. At half-filling, the system is a Mott insulator with a finite spin excitation gap if the on-site Coulomb repulsion is fairly smaller than the antiferromagnetic exchange J. This Mott insulator is characterized by the bond-charge-density-wave order or spontaneously dimerization. In the weak-coupling regime where the spin-charge separation holds approximately, the critical point separating the gapless and gapped spin liquid phases is U(c)similar toJ/2. However, as J increases, the spin-charge couplings become important and the critical point U(c) is significantly suppressed and eventually tends to zero as J-->infinity. Away from half-filling, the charge gap completely collapses but the spin gap persists.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000223716300083
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14033
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:
Dai, JH,Feng, XY,Xiang, T,et al. Gapped spin-liquid states in a one-dimensional Hubbard model with antiferromagnetic exchange interaction[J]. PHYSICAL REVIEW B,2004,70(6):-.
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