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- W2000810012 abstract "A recently proposed combination of a projection operator method with the coherent potential approximation for the computation of the excitation spectra of solids is further extended. In particular, the effect of electron correlations on the matrix elements of the self-energy are investigated. This is done with the help of a Gutzwiller-type variational wave function. Numerical calculations have been performed for a half-filled band of a hypercubic lattice in infinite dimensions. They show that for strong electron correlations the higher-order dynamical corrections in an renormalized perturbation expansion are screened except in the low-energy regime. This provides for a justification of earlier work, where a Hartree-Fock approximation with a cutoff parameter was used for the computation of the static matrix elements." @default.
- W2000810012 created "2016-06-24" @default.
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- W2000810012 date "2004-10-27" @default.
- W2000810012 modified "2023-10-06" @default.
- W2000810012 title "Self-consistent projection operator approach to excitation spectra: Role of correlated wave function" @default.
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- W2000810012 doi "https://doi.org/10.1103/physrevb.70.155112" @default.
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