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Midgap states in antiferromagnetic Heisenberg chains with a staggered field
Lou, JZ; Chen, CF; Zhao, JZ; Wang, XQ; Xiang, T; Su, ZB; Yu, L; Chen, CF , Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA.
2005
发表期刊PHYSICAL REVIEW LETTERS
ISSN0031-9007
卷号94期号:21页码:-
摘要We study low-energy excitations in antiferromagnetic Heisenberg chains with a staggered field which splits the spectrum into a longitudinal and a transverse branch. Bound states are found to exist inside the field induced gap in both branches. They originate from the edge effects and are inherent to spin-chain materials. The sine-Gordon scaling h(s)(2/3)\logh(s)\(1/6) (h(s), the staggered field) provides an accurate description for the gap and midgap energies in the transverse branch for S=1/2 and the midgap energies in both branches for S=3/2 over a wide range of magnetic field; however, it can fit other low-energy excitations only at much lower field. Moreover, the integer-spin S=1 chain displays scaling behavior that does not fit this scaling law. These results reveal intriguing features of magnetic excitations in spin-chain materials that deserve further investigation.
部门归属Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China; Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
关键词Dimensional S=1/2 Antiferromagnet Quantum Spin Chains Copper Benzoate Induced Gap Renormalization-group Weak Ferromagnetism Magnetic-field Yb4as3
学科领域Physics
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收录类别SCI
WOS记录号WOS:000229543900044
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13800
专题理论物理所1978-2010年知识产出
通讯作者Chen, CF , Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA.
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Lou, JZ,Chen, CF,Zhao, JZ,et al. Midgap states in antiferromagnetic Heisenberg chains with a staggered field[J]. PHYSICAL REVIEW LETTERS,2005,94(21):-.
APA Lou, JZ.,Chen, CF.,Zhao, JZ.,Wang, XQ.,Xiang, T.,...&Chen, CF , Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA..(2005).Midgap states in antiferromagnetic Heisenberg chains with a staggered field.PHYSICAL REVIEW LETTERS,94(21),-.
MLA Lou, JZ,et al."Midgap states in antiferromagnetic Heisenberg chains with a staggered field".PHYSICAL REVIEW LETTERS 94.21(2005):-.
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