Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

E. Koch (Department of Physics; Germany); O. Gunnarsson (Max-Planck-Institut fur Festkorperforschung; Stuttgart; University of Illinois; Urbana)

arxiv: cond-mat/9707035 · v1 · submitted 1997-07-03 · ❄️ cond-mat.str-el

Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

O. Gunnarsson (Max-Planck-Institut fur Festkorperforschung , Stuttgart , Germany) , E. Koch (Department of Physics , University of Illinois , Urbana) This is my paper

classification ❄️ cond-mat.str-el

keywords valuesdegeneracydiscretefieldhubbard-stratonovichorbitalpresentedsystems

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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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Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy

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