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Xi, B; Hu, SJ; Zhao, JZ; Su, G; Normand, B; Wang, XQ; Xi, B (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields
Source PublicationPHYSICAL REVIEW B
Language英语
KeywordDimensional S=1/2 Antiferromagnet Cu Benzoate Induced Gap Copper Benzoate Chains Systems Excitation Yb4as3 Esr
AbstractWe 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.
2011
ISSN1098-0121
Volume84Issue:13Pages:134407
Subject AreaPhysics
Indexed BySCI
Funding OrganizationJapan Society for the Promotion of Science; National Science Foundation of China [10874244]; Chinese Ministry of Science and Technology [2007CB925001]; Chinese Ministry of Education ; Japan Society for the Promotion of Science; National Science Foundation of China [10874244]; Chinese Ministry of Science and Technology [2007CB925001]; Chinese Ministry of Education ; Japan Society for the Promotion of Science; National Science Foundation of China [10874244]; Chinese Ministry of Science and Technology [2007CB925001]; Chinese Ministry of Education ; Japan Society for the Promotion of Science; National Science Foundation of China [10874244]; Chinese Ministry of Science and Technology [2007CB925001]; Chinese Ministry of Education
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/14257
Collection理论物理所科研产出_SCI论文
Corresponding AuthorXi, B (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
Recommended Citation
GB/T 7714
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.
APA Xi, B.,Hu, SJ.,Zhao, JZ.,Su, G.,Normand, B.,...&Xi, B .(2011).Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields.PHYSICAL REVIEW B,84(13),134407.
MLA Xi, B,et al."Low-energy properties of anisotropic two-dimensional spin-1/2 Heisenberg models in staggered magnetic fields".PHYSICAL REVIEW B 84.13(2011):134407.
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