Discrete Hubbard-Stratonovich transformations for systems with orbital degeneracy
O. Gunnarsson, E. Koch
Abstract
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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