Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 109: Frustrated Magnets - (General) Theory
TT 109.8: Vortrag
Freitag, 16. März 2018, 11:30–11:45, H 3005
Thermodynamics of the Two-Dimensional Shastry-Sutherland Model for SrCu2(BO3)2 — •Andreas Honecker1, Jonas Stapmanns2, Ido Niesen3, Philippe Corboz3, Bruce Normand4, Frédéric Mila5, and Stefan Wessel2 — 1Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, France — 2Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Germany — 3Institute for Theoretical Physics and Delta Institute for Theoretical Physics, University of Amsterdam, The Netherlands — 4Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen, Switzerland — 5Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
SrCu2(BO3)2 is famous for its rich physical properties and as a realization of the two-dimensional spin-1/2 Shastry-Sutherland model. In the latter model, an orthogonal arrangement of dimers gives rise both to an exact dimer ground state and geometric frustration that renders quantitatively reliable results for the low-temperature thermodynamic properties a challenge since, e.g., conventional Quantum-Monte-Carlo (QMC) simulations suffer from a severe sign problem. A recently developed QMC method in the dimer basis alleviates the sign problem. We assess the range of applicability of this method to the two-dimensional spin-1/2 Shastry-Sutherland model by comparing it to complementary exact diagonalization and high-temperature series. Specifically, we compute the specific heat C and the magnetic susceptibility χ in the parameter regime relevant to SrCu2(BO3)2.