Bethe Ansatz Calculations for Quantum Spin Chains with Partial Integrability

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概要

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• We study the S matrix of a spin-s quantum spin chain which can be interpreted as a multicomponent quantum lattice gas. We show that this system contains integrable subsystems where the Bethe ansatz method is applicable. We demonstrate that for some ranges of parameters of a spin-1 model, the ground states and low-lying excited states are exactly given by those of integrable subsystems ; exact calculation is possible even if the system is not strictly integrable as a whole. We also analyze the magnetization curves for the spin chain, with exact saturation fields.

• 社団法人日本物理学会の論文
• 1995-08-15

著者

• Sato R

  Osaka Univ. Osaka

• Sato Ryutaro

  Department Of Applied Physics Tokai University

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