title: Dynamic structure factor of the two-dimensional Shastry-Sutherland model.
abstract: We calculate the two-triplon contribution to the dynamic structure factor of the two-dimensional Shastry-Sutherland model, realized in SrCu2(BO3)(2), by means of perturbative continuous unitary transformations. For realistic parameters we find flat bound two-triplon bands. These bands show large weight in the structure factor depending strongly on momentum. So our findings permit a quantitative understanding of high precision inelastic neutron scattering experiments.
authors.affiliation: Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Knetter
authors.forename: Götz S
authors.initials: GS
authors.lastname: Uhrig