Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-09-06
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 3 figures
Scientific paper
10.1103/PhysRevB.72.224518
A novel sign-free Monte Carlo method for the Hubbard model has recently been proposed by Corney and Drummond. High precision measurements on small clusters show that ground state correlation functions are not correctly reproduced. We argue that the origin of this mismatch lies in the fact that the low temperature density matrix does not have the symmetries of the Hamiltonian. Here we show that supplementing the algorithm with symmetry projection schemes provides reliable and accurate estimates of ground state properties.
Assaad Fakher F.
Corboz Philippe
Gull Emanuel
Troyer Matthias
Werner Philipp
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