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Updated: Jul 31, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Dispersion and symmetry of bound states in the shastry-sutherland model
Knetter1, Buhler, Muller-Hartmann
1Institut fur Theoretische Physik, Universitat zu Koln, D-50937 Koln, Germany.
Abstract:
Bound states made from two triplet excitations on the Shastry-Sutherland lattice are investigated. Based on the perturbative unitary transformation by flow equations quantitative properties like dispersions and qualitative properties like symmetries are determined. The high order results [up to (J2/J1)(14)] permit one to fix the parameters of SrCu2(BO3)(2) precisely: J1 = 6.16(10) meV, x J2/J1 = 0.603(3), J( perpendicular) = 1.3(2) meV. At the border of the magnetic Brillouin zone a general double degeneracy is derived. An unexpected instability in the triplet channel at x = 0.63 indicates a transition towards another phase. The possible nature of this phase is discussed.
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