Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-09-28
Physics
Condensed Matter
Strongly Correlated Electrons
4 papes, 1 figure in eps format
Scientific paper
10.1103/PhysRevB.63.073105
The calculation of imaginary time displaced correlation functions with the auxiliary field projector quantum Monte-Carlo algorithm provides valuable insight (such as spin and charge gaps) in the model under consideration. One of the authors and M. Imada [F.F. Assaad and M. Imada, J. Phys. Soc. Jpn. 65 189 (1996).] have proposed a numerically stable method to compute those quantities. Although precise this method is expensive in CPU time. Here, we present an alternative approach which is an order of magnitude quicker, just as precise, and very simple to implement. The method is based on the observation that for a given auxiliary field the equal time Green function matrix, $G$, is a projector: $G^2 = G$.
Assaad Fakher F.
Feldbacher M.
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