Numerical Study on the Ground-State Phase Diagram of the S=1/2 XXZ Ladder Model

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概要

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• The ground-state phase diagram of the S=1/2 XXZ ladder model is investigated by using the density-matrix renormalization-group method. This model is composed of two S=1/2 XXZ chains with ferromagnetic rung couplings (λ) and intra-chain anisotropy (Δ), and continuously changes from the two independent S=1/2 XXZ chains at λ=0 to the S=1 XXZ chain in the limit of λ→∞. It is shown that there exist edge states at Δ=1 and λ=1 in relation to the four-fold degeneracy of the ground state and that an excitation gap opens nearly at λ=0 for 0.8≤Δ≤1. In addition, it is clarified that the transition between the Haldane phase and the antiferromagnetic phase occurs at λ=1.15±0.01 for Δ=1. A possible phase diagram in the λ-Δ plane is proposed, which is consistent with the scaling analysis based on the bosonization method.

• 社団法人日本物理学会の論文
• 1995-11-15

著者

• Nakamura Tota

  Institute Of Physics Tsukuba University

• Takada S

  Institute Of Physics University Of Tsukuba

• Nakamura T

  Institute Of Physics University Of Tsukuba

• TAKADA Satoshi

  Institute of Physics,University of Tsukuba

• Narushima Takeshi

  Institute of Physics, University of Tsukuba

• Narushima Takeshi

  Institute Of Physics University Of Tsukuba

• Takada Satoshi

  Institute Of Physics University Of Tsukuba

• Takada Satoshi

  Institute For Solid States Physics University Of Tokyo : Department Of Physics College Of General Education University Of Tokyo

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