Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

Details Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

1997-07-03

arxiv.org/abs/cond-mat/9707035v1

Phys. Lett. A, 235 (1997) 530

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, revtex, 1 eps figure, additional material avalable at http://librix.mpi-stuttgart.mpg.de/docs/ANDERSEN/fullerene/

Scientific paper

10.1016/S0375-9601(97)00661-0

A discrete Hubbard-Stratonovich transformation is presented for systems with an orbital degeneracy $N$ and a Hubbard Coulomb interaction without multiplet effects. An exact transformation is obtained by introducing an external field which takes $N+1$ values. Alternative approximate transformations are presented, where the field takes fewer values, for instance two values corresponding to an Ising spin.

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