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Phys Rev Lett. 2008 Jun 20;100(24):247206. Epub 2008 Jun 19.

Nested cluster algorithm for frustrated quantum antiferromagnets.

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1
Institute for Theoretical Physics, Bern University, Sidlerstrasse 5, 3012 Bern, Switzerland.

Abstract

Frustrated antiferromagnets are important materials whose quantum Monte Carlo simulation suffers from a severe sign problem. We construct a nested cluster algorithm which uses a powerful strategy to address this problem. For the spin 1/2 Heisenberg antiferromagnet on a kagome and on a frustrated square lattice the sign problem is eliminated for large systems. The method is applicable to general lattice geometries but limited to moderate temperatures.

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