New many body perturbation method and the Hubbard model
β Scribed by Tadashi Arai; Mario Tosi
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 313 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0038-1098
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
The principles of an efficient, fast algorithm for the calculation of diagrams appearing in Green function and many-body perturbation methods are discussed and timing examples are given. Within the suggested algorithm, the third order-diagrams required in the Green function approach are evaluated by
The ground state as well as some low-lying excited states of the Ne q molecule are 2 calculated by means of the third-order multireference many-body perturbation theory with the ''full'' eight-orbital valence space using DZP and polarized valence TZ basis sets. The problem encountered with a large n
The second-order multireference perturbation theory employing multiple partitioning of the many-electron Hamiltonian into a zero-order part and a perturbation is formulated in terms of many-body diagrams. The essential difference from the standard diagrammatic technique of Hose and Kaldor concerns t
The reaction energy ofthe hydrogen elimination from H,CO is calculated using complete fourth-order many-body permrbation theory (MBPT) and the coupled cluster (CC) methad including up to triple excitation operators. For a number of basis sets the CC reaction energy IS closer to the experimental valu