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Gapped spin-liquid states in a one-dimensional Hubbard model with antiferromagnetic exchange interaction
Dai, JH; Feng, XY; Xiang, T; Yu, Y; Dai, JH , Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China.
2004
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号70期号:6页码:-
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.
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
关键词Matrix Renormalization-group T-j Model Phase-diagram Superconductivity Transition Systems Lattice Waves Chain
学科领域Physics
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收录类别SCI
WOS记录号WOS:000223716300083
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被引频次:24[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/311006/14033
专题理论物理所1978-2010年知识产出
通讯作者Dai, JH , Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China.
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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):-.
APA Dai, JH,Feng, XY,Xiang, T,Yu, Y,&Dai, JH , Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China..(2004).Gapped spin-liquid states in a one-dimensional Hubbard model with antiferromagnetic exchange interaction.PHYSICAL REVIEW B,70(6),-.
MLA Dai, JH,et al."Gapped spin-liquid states in a one-dimensional Hubbard model with antiferromagnetic exchange interaction".PHYSICAL REVIEW B 70.6(2004):-.
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