Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: Correlated Electrons: Frustrated Magnets - Theory
TT 50.7: Talk
Wednesday, March 9, 2016, 16:45–17:00, H18
Quantum Monte Carlo in the spin dimer-basis — •Jonas Stapmanns1, Andreas Honecker2, and Stefan Wessel1 — 1Institute for Theoretical Solid State Physics RWTH Aachen University, Aachen, Germany — 2Laboratoire de Physique Théorique et Modélisation Université de Cergy-Pontoise, Pontoise, France
Quantum Monte Carlo simulations of frustrated spin systems are usually plagued by a severe sign-problem. However, due to its dependence on the employed computational basis, it can be feasible to reduce or even avoid the sign-problem by an appropriate local basis choice. Here, we consider in particular the possibility of simulating dimerized quantum spin systems based on a spin dimer-basis formulation of the stochastic series expansion algorithm. We discuss this simulation scheme and present results for thermodynamic properties of the fully-frustrated spin-1/2 Heisenberg ladder as well as for the fully-frustrated square lattice bilayer Heisenberg model.