Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets 2

TT 30.1: Vortrag

Donnerstag, 28. Februar 2008, 10:30–10:45, EB 202

Quantum phases of the anisotropic Shastry-Sutherland model — •Zi Yang Meng and Stefan Wessel — Institute for Theoretical Physics III, Stuttgart University, Germany

We present results from quantum Monte Carlo simulations of the anisotropic spin-1/2 XXZ model on the orthogonal dimer lattice of the Shastry-Sutherland model, in the sign-problem free parameter region with ferromagnetic transverse spin exchange. In this regime, the model also corresponds to a system of repulsive hard-core bosons. In the absence of a magnetic field, we find solid, superfluid and a dimer triplet phase, and study the various quantum phase transitions between these phases. We also study the magnetization process out of the dimer triplet phase and explore the possibility of triplon supersolidity in this system. Implications of our results for the Heisenberg antiferromagnet on the Shastry-Sutherland model and the compound SrCu₂(BO₃)₂ are discussed.