Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions (joint session MA/TT)
MA 23.1: Vortrag
Dienstag, 10. März 2026, 14:00–14:15, POT/0151
Stochastic Simulation of Phase Transitions in the Dissipative 2D XYZ-Model — •Franz Pöschl1,2,3, Przemyslaw Zielinski1,2,3, Xin Zhang1,2,3, and Peter Rabl1,2,3 — 1Technical University of Munich, TUM School of Nat- ural Sciences, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
The simulation of large, open quantum spin systems is a hard problem and for most cases it is not possible to get exact solutions. Therefore, we use methods in the class of the Truncated Wigner Approximations to tackle this problem. In our work we investigated the hybrid discrete-continuous truncated Wigner approximation and used it to determine the phase diagram of the dissipative 2D XYZ-model. We were able to simulate systems with several thousands of spins due to the linear scaling of the method and numerical optimization of our code. Hence we were able to simulate the phase transitions of the model and also characterize the different phases in the open quantum system.
Keywords: Non-equilibrium Phase Transitions; Truncated Wigner Approximation; 2D XY-Model; Spin systems