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By using the perturbation expansion up to the fifth order, we study thetwo-triplet-dimer excitation spectra in the Shastry-Sutherland model, where thelocalized nature of a triplet-dimer, the propagation of a triplet-dimer pair bythe correlated hopping and the long-range interactions between triplet-dimersplay an essential role. It is found that the dispersion relations forfirst-neighbor triplet-dimer pair excitations with S=1 and p-type symmetryqualitatively explain the second-lowest branch observed in the neutroninelastic scattering experiment. It is also predicted that the second-lowestbranch consists of two components, p_x- and p_y-states, with slightly differentexcitation energies. The origin of the singlet mode at 3.7meV observed in theRaman scattering experiment is also discussed.Comment: 5 pages, 3 figure

Two-Triplet-Dimer Excitation Spectra in the Shastry-Sutherland Model for SrCu 2(BO 3) 2

Two-Triplet-Dimer Excitation Spectra in the Shastry-Sutherland Model for SrCu₂(BO₃)₂