| Quantum Phase Transition in Quasi-two-dimensional Heisenberg Antiferromagnet with Single-Ion Anisotropy |
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| 作者姓名： | JI An-Chun TIAN Guang-Shan |
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| 作者单位： | School of Physics, Peking University, Beijing 100871, China |
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| 基金项目： | The project partially supported by National Natural Science Foundation of China under Grant No. 90403003; We thank Prof. Xiao-Qun Wang and Prof. Tao Li for useful discussions. Numerical computation of this work was carried out on the Parallel Computer Cluster of Insti- tute for Condensed Matter Physics （ICMP） at School of Physics, Peking University. |
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| 摘 要： | In the present paper, we investigate the quantum phase transition in a spatially anisotropic antiferrornagnetic Heisenberg model of S =1 with single-ion energy anisotropy. By using the Schwinger boson representation, we calculate the Gaussian correction to the critical value J⊥^c caused by quantum spin fluctuations. We find that, for the positive single-ion energy, a nonzero value of J⊥^c is always needed to stabilize the antiferromagnetic long-range order in this model. It resolves a difference among literature and shows clearly that the effect of quantum fluctuations may qualitatively change a result obtained by the mean-field theories on lower-dimensional systems.
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| 关 键 词： | 量子相变 二维海森堡反铁磁体 单离子各向异性 空间各向异性 |
| 修稿时间： | 2006-04-26 |
Quantum Phase Transition in Quasi-two-dimensional Heisenberg Antiferromagnet with Single-Ion Anisotropy |
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| JI An-Chun TIAN Guang-Shan.Quantum Phase Transition in Quasi-two-dimensional Heisenberg Antiferromagnet with Single-Ion Anisotropy[J].Communications in Theoretical Physics,2007,47(1):171-180. |
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| Authors: | JI An-Chun TIAN Guang-Shan |
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| Abstract: | |
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| Keywords: | spatially anisotropic Heisenberg model single-ion anisotropy functional integration Schwinger-Boson representation |
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