String Order Parameters in the Haldane Gap Phase of the Spin-1/2 Alternating Heisenberg Chain : Numerical Diagonalization and Variational Study
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概要
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Two possible extensions of the string order parameter originally defined for thespin- 1 Heisenberg chain to the spin- l /2 alternating Heisenberg chain ;tre examined bycomparing the numerical diagonalization results of finite size systems and the variational results. It is suggested that the naive extension in which the spin-1 operator issimply replaced by the sum of two spin-l /2 operators can be regarded as the valencebond solid (VBS) order parameter while another extension proposed by Hida cor-responds to the measure of the strength of the localized singlet taking the full valuefor the completely localized singlet state.Heisenberg model, Flaldane gap, string order, valence bond solid
- 社団法人日本物理学会の論文
- 1992-06-15
著者
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Hida Kazuo
Department Of Physics Faculty Of Science Saitama University
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Hida Kazuo
Department Of Engineering Science Faculty Of Engineering Hokkaido University
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TAKADA Satoshi
Institute of Physics,University of Tsukuba
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Takada Satoshi
Institute Of Physics University Of Tsukuba
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