Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Symposium: Efficient Classical Simulation of Strongly Correlated Quantum Systems
TT 16.7: Vortrag
Dienstag, 26. Februar 2008, 17:30–17:45, H 0104
Optimized ensembles in quantum Monte Carlo simulations — •Stefan Wessel1, Norbert Stoop2, Emanuel Gull2, Simon Trebst3, and Matthias Troyer2 — 1Institute for Theoretical Physics, Stuttgart University, Germany — 2Theoretical Physics, ETH Zurich, Switzerland — 3Microsoft Research, Station Q, University of California Santa Barbara, USA
We present an adaptive means for improving the efficiency of Monte Carlo simulations of quantum systems in rough free energy landscapes. Such occur e.g. near strongly first-order (quantum) phase transitions, and due to competing interactions. Our approach is based on an extension of the concept of optimized broad-histogram ensembles for classical simulations to the quantum regime. We present examples of this approach within the context of the stochastic series expansion quantum Monte Carlo approach, and indicate the limits of such extended ensemble methods.