Magnetization Plateau of the S=1/2 Frustrated Heisenberg Chain with Period 3 Parity Invariant Exchange Modulation(Magnetization Plateaus, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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The magnetization plateau of the S=1/2 frustrated Heisenberg chain with period 3 parity invariant exchange modulation is investigated by the bosonization and numerical exact diagonalization method. The ground state phase diagram at 1/3 of the saturated magnetization is obtained. Among three degenerate ↑↑↓-type plateau states in the uniform chain, two of them (↓↑↑↓↑↑… and ↑↓↑↑↓↑…) turned out to be robust against the period 3 exchange modulation which favors the 〓↑〓↑… phase up to a critical value of the modulation amplitude (〓= singlet dimer) resulting in the Z_2 symmetry broken phase. Another ↑↑↓-type state with ↑↑↓↑↑↓… configuration is stabilized for period 3 modulation with opposite sign. The transition between the 〓↑〓↑…-phase and Z_2-broken phase is the Ising transition and that between the ↑↑↓↑↑↓…-phase and Z_2 broken phase is the first order transition. The spin configuration in each phase is numerically verified by applying the local symmetry breaking field.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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Hida K
Saitama Univ. Saitama
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Affleck Ian
Department Of Physics And Astronomy University Of British Columbia
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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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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 Physics, University of Tokyo
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