A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.
This yields a matrix- valued continued-fraction representation, G(z) =A 0 +B 0 1 z−A1−B1 1 z−A2−...B1 B0,(A10) whereA i,B i∈CN×Nare Hermitian matrices, and the chain has lengthM
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Symmetric estimator for discrete self-energy of discrete many-body systems
A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.