Dynamic Structure Factor of the Two-Dimensional Shastry-Sutherland Model
Christian Knetter, Goetz S. Uhrig
TL;DR
This paper computes the two-triplon contribution to the dynamic structure factor of the 2D Shastry-Sutherland model, revealing flat bound bands with momentum-dependent weight, aiding interpretation of neutron scattering data.
Contribution
It introduces a perturbative continuous unitary transformation approach to quantify the 2-triplon dynamics in the Shastry-Sutherland model for realistic parameters.
Findings
Identification of flat bound 2-triplon bands.
Strong momentum dependence of spectral weight.
Enhanced understanding of neutron scattering experiments.
Abstract
We calculate the 2-triplon contribution to the dynamic structure factor of the 2-dimensional Shastry-Sutherland model, realized in SrCu2(BO3)2, by means of perturbative continuous unitary transformations. For realistic parameters we find flat bound 2-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.
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