Transition rates via Bethe ansatz for the spin-1/2 planar XXZ antiferromagnet
arXiv:cond-mat/0303147 · doi:10.1088/0305-4470/36/20/301
Abstract
A novel determinantal representation for matrix elements of local spin operators between Bethe wave functions of the one-dimensional s=1/2 XXZ model is used to calculate transition rates for dynamic spin structure factors in the planar regime. In a first application, high-precision numerical data are presented for lineshapes and band edge singularities of the in-plane (xx) two-spinon dynamic spin structure factor.
8 pages, 2 figures