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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General 1 (joint session TT/MA)

TT 23.5: Vortrag

Dienstag, 2. April 2019, 10:30–10:45, Theater

Thermodynamics of the 2D S=1/2 Shastry-Sutherland Model and SrCu2(BO3)2Alexander Wietek1, Philippe Corboz2, Frédéric Mila3, Bruce Normand4, Stefan Wessel5, and •Andreas Honecker61Center for Computational Quantum Physics, Flatiron Institute, New York, USA — 2Institute for Theoretical Physics and Delta Institute for Theoretical Physics, University of Amsterdam, The Netherlands — 3Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland — 4Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Switzerland — 5Institut für Theoretische Festkörperphysik, RWTH Aachen University, Germany — 6Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, France

Reliable computation of the low-temperature thermodynamic properties of highly frustrated quantum magnets such as the 2D S=1/2 Shastry-Sutherland model is a considerable challenge. Notwithstanding recent progress with QMC simulations in the dimer basis, the parameter regime relevant to SrCu2(BO3)2 has remained inaccessible [1]. Here we present accurate results obtained from two other methods, namely Thermal Pure Quantum (TPQ) states and infinite Projected Entangled Pair States (iPEPS). We observe the emergence of a low-temperature peak in the specific heat C and relate it to the large number of bound states that emerge close to the first-order transition from the dimer to the plaquette phase.

[1] S. Wessel, I. Niesen, J. Stapmanns, B. Normand, F. Mila, P. Corboz, A. Honecker, Phys. Rev. B 98, 174432 (2018)

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