A discrete Hubbard-Stratonovich decomposition for general, fermionic two-body interactions

Abstract

A scheme is presented to decompose the exponential of a two-body operator in a discrete sum over exponentials of one-body operators. This discrete decomposition can be used instead of the Hubbard-Stratonovich transformation in auxiliary-field quantum Monte-Carlo methods. As an illustration, the decomposition is applied to the Hubbard model, where it is equivalent to the discrete Hubbard-Stratonovich transformation introduced by Hirsch, and to the nuclear pairing Hamiltonian.

8 pages, includes 2 eps figures, to appear in Phys. Lett. A

References in corpus (1)

• Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

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