Abstract
A dynamical mean-field theory analysis of the attractive Hubbard model in the normal phase is carried out upon restricting to solutions where superconducting order is not allowed. A clear first-order pairing transition as a function of the coupling takes place at all the electron densities out of half filling between a Fermi liquid, stable for , and an insulating bound pairs phase for , and it is accompanied by phase separation. The spectral function in the metallic phase is constituted by a low-energy structure around the Fermi level, which disappears discontinuously at , and two high-energy features (Hubbard bands), which persist in the insulating phase.
- Received 30 October 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.126403
©2002 American Physical Society