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题名: Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields
作者: Xi, B ;  Hu, SJ ;  Zhao, JZ ;  Su, G ;  Normand, B ;  Wang, XQ
刊名: PHYSICAL REVIEW B
出版日期: 2011
卷号: 84, 期号:13, 页码:134407
关键词: DIMENSIONAL S=1/2 ANTIFERROMAGNET ;  CU BENZOATE ;  INDUCED GAP ;  COPPER BENZOATE ;  CHAINS ;  SYSTEMS ;  EXCITATION ;  YB4AS3 ;  ESR
学科分类: Physics
通讯作者: Xi, B (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
部门归属: [Xi, Bin; Hu, Shijie; Normand, B.; Wang, Xiaoqun] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China; [Xi, Bin] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Xi, Bin; Su, Gang] Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 100049, Peoples R China; [Hu, Shijie] Univ Gottingen, Inst Theoret Phys, D-37077 Gottingen, Germany; [Zhao, Jize] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan; [Zhao, Jize] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA
英文摘要: We present a systematic study of the anisotropic spin-1/2 Heisenberg model in staggered magnetic fields in two dimensions. To mimic real materials, we consider a system of coupled, antiferromagnetic chains, whose interchain interaction can be either ferro-or antiferromagnetic. When the staggered field is commensurate with the magnetic interactions, an energy gap opens immediately and follows a power law as a function of the applied field, similar to the situation in one dimension. When the field competes with the interactions, a quantum phase transition (QPT) occurs from a gapless, magnetically ordered phase at low fields to a gapped, disordered regime. We use a continuous-time Monte Carlo method to compute the staggered moment of the ordered phases and the spin gap of the disordered phases. We deduce the phase diagrams as functions of the anisotropy ratio and the applied field, and calculate the scaling behavior of the models in both quantities. We show that in the competitive case, the staggered field acts to maintain a regime of quasi-1D behavior around the QPT, and we discuss as a consequence the nature of the crossover from one-dimensional (1D) to 2D physics.
资助者: Japan Society for the Promotion of Science; National Science Foundation of China [10874244]; Chinese Ministry of Science and Technology [2007CB925001]; Chinese Ministry of Education
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000295793900006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14257
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Xi, B,Hu, SJ,Zhao, JZ,et al. Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields[J]. PHYSICAL REVIEW B,2011,84(13):134407.
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