Phase Transition of the Two-Dimensional Heisenberg Antiferromagnet on the Triangular Lattice
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- Kawamura Hikaru
- Department of Physics, College of General Education, Osaka University
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- Miyashita Seiji
- Department of Physics, Faculty of Science, Tokyo University
書誌事項
- タイトル別名
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- Phase Transition of the Two Dimensional
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抄録
Ordering process of the antiferromagnetic Heisenberg model on the two-dimensional triangular lattice is studied both by topological analysis of defects and by Monte Carlo simulation. It is shown that the order parameter space of this model is isomorphic to the three-dimensional rotation group SO(3) due to the inherent frustration effect. Homotopy analysis shows that the system bears a topologically stable point defect characterized by a two-valued topological quantum number and exhibits a phase transition driven by the dissociation of the vortices. A Monte Carlo study on the specific heat and the behavior of vortices strongly suggests the occurence of a Kosterlitz-Thouless-type phase transition. It is, however, argued that in contrast to the two-dimensional XY model, the spin-correlation function decays exponentially even in the low-temperature phase. In order to distinguish the high- and low-temperature phases qualitatively, we introduce a “vorticity function” analogously to the Wilson loop in the quark-confinement problem in the lattice gauge theory. A discussion is made on possible interpretations of the experimental data for triangular lattice Heisenberg antiferromagnets.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 53 (12), 4138-4154, 1984
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390001204184356352
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- NII論文ID
- 210000091884
- 110001966727
- 110001975900
- 130003739119
- 210000091755
- 130003738976
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- NII書誌ID
- AA00704814
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- COI
- 1:CAS:528:DyaL2MXovVOhug%3D%3D
- 1:CAS:528:DyaL2cXhtFemtbc%3D
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- ISSN
- 13474073
- 00319015
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可