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タイトル: Quantum Phase Transition of Two-Dimensional Diluted Heisenberg Antiferromagnet
著者: Todo, Synge
Yasuda, Chitoshi
Kato, Kiyoshi
Harada, Kenji
Kawashima, Maoki
Miyashita, Seiji
Takayama, Hajime
著者名の別形: 原田, 健自
発行日: 1-Jan-2000
出版者: Oxford University Press
誌名: Progress of Theoretical Physics Supplement
巻: 138
開始ページ: 507
終了ページ: 512
抄録: Quantum phase transition of site-diluted and bond-diluted Heisenberg antiferromagnets on square lattices is studied. By using the novel continuous-time loop algorithm, we perform quantum Monte Carlo simulations on quite larger lattices at extremely lower temperatures than the previous numerical studies. It is found that the antiferromagnetic long-range order at T = 0 persists so long as a cluster of magnetic sites percolates, that is, the critical concentration is equal to the classical percolation threshold, in both of the site-diluted and bond-diluted cases. Furthermore, we find that some critical exponents, such as the magnetization exponent β, are non-classical and strongly depend on the spin size S. On the other hand, we show that the correlation-length exponent ν is universal and is equal to the classical value (ν=4/3).
記述: Published on behalf of Journal of the Physical Society of Japan
著作権等: © The Physical Society of Japan
URI: http://hdl.handle.net/2433/200800
DOI(出版社版): 10.1143/PTPS.138.507
出現コレクション:学術雑誌掲載論文等

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