Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 109: Frustrated Magnets - (General) Theory
TT 109.2: Vortrag
Freitag, 16. März 2018, 09:45–10:00, H 3005
Quantum Monte Carlo Study of the Thermodynamics of the Fully Frustrated Heisenberg Bilayer — •Stefan Wessel1, Jonas Stapmanns1, Andreas Honecker2, Philippe Corboz3, Bruce Normand4, and Frederic Mila5 — 1Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, Germany — 2Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, France — 3Institute for Theoretical Physics and Delta Institute for Theoretial Physics, University of Amsterdam, The Netherlands — 4Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen, Switzerland — 5Institute of Physics, Ecole Polytechnique Fédérale Lausanne (EPFL), Switzerland
We examine the thermal properties of the spin-1/2 Heisenberg model on the fully frustrated square lattice bilayer. For this purpose, we use a sign problem-free quantum Monte Carlo approach that is based on a decoupling of the Hamiltonian in an inter-layer spin dimer basis. At zero temperature, a discontinuous quantum phase transition separates a inter-layer singlet phase from an antiferromagnetic ground state forming from inter-layer triplet states. We show that this discontinuous transition extends towards finite temperatures, i.e., in the absence of long-range order. The thermodynamic behavior of this system furthermore exhibits similarities to the liquid-gas transition.