Nested cluster algorithm for frustrated quantum antiferromagnets

Phys Rev Lett. 2008 Jun 20;100(24):247206. doi: 10.1103/PhysRevLett.100.247206. Epub 2008 Jun 19.


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.