S=1/2 Quantum Heisenberg Ladder and S=1 Haldane Phase
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概要
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We investigate an S=(1/2) ladder model with a ferromagnetic interchain coupling (-λ) and an antiferromagnetic intrachain coupling based on the bosonization method, which reduces to the S=1 antiferromagnetic Heisenberg model in the limit λ→∞. We argue with the aid of Wilson's renormalization group method that the ground state is the Haldane state with an excitation gap for λ>0, that the gap opens at λ=0 exponentially and that the critical index of the coherence length is unity (v=1) on the critical line between the antiferromagnetic and the Haldane phases. Further-more, it is found that the string order parameter proposed by den Nijs and Rommelse is expressed by a local order parameter in the bosonization method.
- 社団法人日本物理学会の論文
- 1993-08-15
著者
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Watanabe Hiroshi
Institute For Chemical Research Kyoto University
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Takada Satoshi
Institute Of Physics University Of Tsukuba
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Nomura Kiyohide
Tokyo Institute of Technology
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