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VOLUME 80 | ISSUE 1 | PAGE 67
Continuous time quantum Monte Carlo method for fermions: beyond auxiliary field framework
A. N. Rubtsov+, A. I. Lichtenstein* 1)
+Physics department, Moscow State University, 119992 Moscow, Russia
*Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany


PACS: 02.70.Ss, 71.10.Fd, 71.27.+a
Abstract
Numerically exact continuous-time Quantum Monte Carlo algorithm for finite fermionic systems with non-local interactions is proposed. The scheme is particularly applicable for general multi-band time-dependent correlations since it does not invoke Hubbard--Stratonovich transformation. The present determinantal grand-canonical method is based on a stochastic series expansion for the partition function in the interaction representation. The results for the Green function and for the time-dependent susceptibility of multi-orbital super-symmetric impurity model with a spin-flip interaction are presented.


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