We calculate the one-electron Green's function of the two-dimensional (2D) attractive Hubbard model by coupling the electrons to pair fluctuations. The latter are approximated by homogeneous amplitude fluctuations and phase correlations corresponding to the XY-model. The electronic density of states shows a pseudogap at temperatures well above the transition temperature Tc. For a quasi-3D system, a superconducting gap emerges out of the pseudogap below Tc.
Titre
Pseudogap in the one-electron spectral functions of the attractive Hubbard model
Date
1999-01
Publié dans
Physica B: Condensed Matter
Volume
1999, vol. 259–261, pp. 501-503
Pagination
3 p.
ISSN
0921-4526
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.