Date of Original Version
A novel determinantal representation for matrix elements of local spin operators between Bethe wavefunctions 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.
Biegel, D., Karback, M., & Müller, G. (2003). Transition rates via Bethe ansatz for the spin-1/2 planar XXZ antiferromagnet. Journal of Physics A, 36, 5361-5368.
Available at: http://dx.doi.org/10.1088/0305-4470/36/20/301