Elementary Excitations in the One-Dimensional Spin-1/2 Anisotropic Heisenberg Model with Competing Interactions

概要

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Elementary excitations are studied near the Ising limit close to the degenerate pointin the one-dimensional anisotropic Heisenberg antiferrom;tgnets with up to next-nearest-neighbor interactions. Solitons in the Neel and (2,2) antiphase states andtriplet-dimer excitations in the dimer state are found as propagating modes. These ex-citations are found to dominate the shape of the central peak in dynamical spin cor-relation functions, through the comparison witln the numerical results by an exactdiagonalization method for finite chains. The ternperature dependence of the staticcorrelation function is also discussed, and the shape is fotund to change graduallywith increasing temperature, approaching the zeu'o-temperature correlation functionat the degenerate point.
社団法人日本物理学会の論文
1989-06-15