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    题名: Quantum phase transition in double triangular layer
    作者: Shik, H. Y.;陳惟堯;Chen, Wei-yeu;Lin, Hai-qing
    贡献者: 淡江大學物理學系
    关键词: Dimerized state;Quantum phase transition;Soluble quantum spin model
    日期: 2004-05-01
    上传时间: 2009-12-31 10:27:52 (UTC+8)
    出版者: Elsevier
    摘要: We study a quantum spin model defined on a double triangular layer whose ground state and the first few excited states could be rigorously obtained for any spin S. There exist two kinds of ground state, one is a complete dimerized state, and the other one is the ground state of corresponding spin-2S model defined on the single triangular layer. Quantum phase transition points are determined by the spin-wave theory and verified by exact diagonalization study of finite clusters. The excitation spectrum is investigated and we found that there exists a singlet to singlet transition as well as triplet to singlet transition as parameters vary.
    關聯: Journal of Magnetism and Magnetic Materials 272-276(1), pp.203-204
    DOI: 10.1016/j.jmmm.2003.12.1039
    显示于类别:[物理學系暨研究所] 期刊論文


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