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题名: Midgap states in antiferromagnetic Heisenberg chains with a staggered field
作者: Lou, JZ ;  Chen, CF ;  Zhao, JZ ;  Wang, XQ ;  Xiang, T ;  Su, ZB ;  Yu, L
刊名: PHYSICAL REVIEW LETTERS
出版日期: 2005
卷号: 94, 期号:21, 页码:-
关键词: DIMENSIONAL S=1/2 ANTIFERROMAGNET ;  QUANTUM SPIN CHAINS ;  COPPER BENZOATE ;  INDUCED GAP ;  RENORMALIZATION-GROUP ;  WEAK FERROMAGNETISM ;  MAGNETIC-FIELD ;  YB4AS3
学科分类: Physics
通讯作者: Chen, CF , Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA.
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
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000229543900044
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13800
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:
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):-.
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