We calculate the one-electron spectral function of the attractive (negative-U) Hubbard model. We work in the intermediate-coupling and low-density regime and obtain the self-energy in an approximate analytical form. The excitation spectrum is found to consist of three branches. The results are obtained in a framework based on the self-consistent T-matrix approximation, which is compatible with the Mermin-Wagner theorem.
Titre
One-electron spectral functions of the attractive Hubbard model for intermediate coupling
Date
1998-03
Publié dans
Physical Review B
Volume
1998, vol. 57, no. 10, pp. 5995-6002
Pagination
8 p.
ISSN
0163-1829
Type d'article
scientifique
Domaine
Ingénierie et Architecture
Ecole
HEIG-VD
Institut
iE - Institut des Energies
Note
CAPEZZALI, Massimiliano est chercheur à la HES-SO, HEIG-VD, depuis 2017.
Cette publication a été rédigée par un membre de l’ancien institut IESE - Institut d'Energie et Systèmes Electriques.