一般化されたHartree-Fock理論-電子相関をいれる一つの試み-

Abstract

A generalized Hartree-Fock theory in terms of the temperature Green's function is presented to take the electronic correlation effect into account. The correlation effect due to the exotonic pairs causes instabilities in the usual Hartree-Fock state and results in producing new states, e.g., SDW(spin density wave), CDW (charge density wave) and so on. Exitation processes are also examined by analyzing a vertex function, and it is pointed out that degeneracy in triplet states might be resolved due to electronic correlation.