A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.
The Green’s function then takes the form G(z) =A 0 +B 0 1 z−A1−∑M′ i=1 Bi 1 z−ai+1 Bi B0,(A26) with the impurity at site index 1 and the bath sites at indices 2 toM ′+ 1
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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.