Moment-Conserving Decoupling Procedure for Many-Body Problems
- 10 April 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 180 (2), 544-546
- https://doi.org/10.1103/physrev.180.544
Abstract
A new, well-defined procedure for linearizing double-time, statistical Green's functions is proposed. The resultant spectral function automatically conserves the first several frequency moments. This compares very favorably with the usual mean-field decoupling results, which conserve only the first (and, rarely, up to three) frequency moments.Keywords
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- Heisenberg exchange Hamiltonian from narrow energy band theoryProceedings of the Physical Society, 1967
- Electron correlations in narrow energy bandsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963
- Double-time Green functions in statistical physicsUspekhi Fizicheskih Nauk, 1960