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We investigate the one-triplet dispersion in a modified Shastry-SutherlandModel for SrCu_2(BO_3)_2 by means of a series expansion about the limit ofstrong dimerization. Our perturbative method is based on a continuous unitarytransformation that maps the original Hamiltonian to an effective, energyquanta conserving block diagonal Hamiltonian H_{eff}. The dispersion splitsinto two branches which are nearly degenerated. We analyse the symmetries ofthe model and show that space group operations are necessary to explain thedegeneracy of the dispersion at k=0 and at the border of the magnetic Brillouinzone. Moreover, we investigate the behaviour of the dispersion for small |k|and compare our results to INS data.Comment: 9 pages, 8 figures accepted by J. Phys.: Condens. Matte

Symmetries and triplet dispersion in a modified Shastry-Sutherland model for SrCu2(BO3)2

Symmetries and triplet dispersion in a modified Shastry-Sutherland model for SrCu₂(BO₃)₂