Excitation Spectrum of One-Dimensional Spin-1 Antiferromagnetic Heisenberg Chain: Green's Function Approach
نویسنده
چکیده
The one-dimensional spin-1 Heisenberg antiferromagnetic chain is studied by a Green's function technique. The excitation spectrum is obtained. The dispersion of excitations for an infinite isotropic chain is numerically calculated. At k 0 we obtain a gap 2D which is equal to 0:826J and at k p we obtain D 0:41J, which is in very good agreement with the exact numerical results of White and Huse.
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تاریخ انتشار 1998