The single-particle Green’s function

J. E. Young

John C. Inkson

J. Schirmer

Alba Theumann

In this paper we compute the single-particle Green's function for a system of N-interacting fermions in one dimension. The problem is exactly soluble in the case of a δ-function potential. We consider also the case of a small modification to a δ-function potential and we compute the Green's function up to first order in a perturbation expansion. In both cases we find that the Green's function has a branch cut in the complex energy plane but it has no single-particle poles.

小杉太一, Taichi Kosugi, 松下雄一郎 +1 more

Wannier interpolation of one-particle Green’s functions from coupled-cluster singles and doubles (CCSD), Wannier interpolation of one-particle Green’s functions from coupled-cluster singles and doubles (CCSD)