Density Matrix Renormalization Group Study of the S = 1/2 Antiferromagnetic Heisenberg Chains with Quasiperiodic Exchange Modulation
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概要
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The S = 1/2 antiferromagnetic XXZ chains with precious mean quasiperiodic exchange modulation is studied by the density matrix renormalization group method. It is found that the energy gap △E scales as exp(-cN^ω) with the system size N if the Ising component of the exchange coupling is antiferromagnetic. This is in contrast to the XY case in which △E 〜 N^<-z>. Our results are not only consistent with the bosonization analysis of Vidal, Mouhanna and Giamarchi but also clarify the nature of the strong coupling ground state which is unreachable within the weak coupling calculation of Ref. 9).
- 理論物理学刊行会の論文
- 2000-04-28
著者
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Hida K
Saitama Univ. Saitama
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Hida Kazuo
Department Of Physics Faculty Of Science Saitama University
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Hida Kazuo
Department Of Physics Saitama University
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Hida Kazuo
Department Of Engineering Science Faculty Of Engineering Hokkaido University
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HIDA Kazuo
Department of Physics, Saitama University
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HIDA Kazuo
Department of Physics, University of Tokyo
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