Magnon Dispersion and Anisotropies in SrCu2(BO3)2
Y. F. Cheng, O. Cepas, P. W. Leung, T. Ziman
Abstract
We study the dispersion of the magnons (triplet states) in SrCu2(BO3)2 including all symmetry-allowed Dzyaloshinskii-Moriya interactions. We can reduce the complexity of the general Hamiltonian to a new simpler form by appropriate rotations of the spin operators. The resulting Hamiltonian is studied by both perturbation theory and exact numerical diagonalization on a 32-site cluster. We argue that the dispersion is dominated by Dzyaloshinskii-Moriya interactions. We point out which combinations of these anisotropies affect the dispersion to linear-order, and extract their magnitudes.
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