Theory of Two-Magnon Bound States in a Two-Dimensional Antiferromagnet
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概要
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Two-magnon bound states are calculated for an antiferromagnetic spin system of the square lattice by the method developed by one of the authors in a previous paper. The calculations are carried out for the two cases; the total wave number K_x=K_y=0, and K_x=K_y=π/2. In both cases, two-magnon bound states exist in the Ising model, but they merge with the band as the anisotropy of exchange interactions, decreases, and there are no bound states in the Heisenberg model. The difference between the existence of two-magnon bound states in a ferromagnet and in an antiferromagnet is discussed.
- 社団法人日本物理学会の論文
- 1973-06-05
著者
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Oguchi Takehiko
Department Of Physics Tokyo Institute Of Technology
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Ishikawa Takuma
Department Of Materials Science Iwakimeisei University
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Oguchi Takehiko
Department Of Physics Tokyo Insitute Of Technology:the Technological University Of Nagaoka
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Ishikawa Takuma
Department of Electrical and Electronic Engineering, College of Engineering, Nihon University, Tamura-machi, Koriyama, Fukushima 963-8642, Japan
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