title: First-order pairing transition and single-particle spectral function in the attractive hubbard model.
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 U<U(c), and an insulating bound pairs phase for U>U(c), 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 U = U(c), and two high-energy features (Hubbard bands), which persist in the insulating phase.
authors.affiliation: Dipartimento di Fisica, Università di Roma La Sapienza, and INFM Center for Statistical Mechanics and Complexity, Piazzale Aldo Moro 2, I-00185 Roma, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Capone
authors.forename: C
authors.initials: C
authors.lastname: Castellani
authors.forename: M
authors.initials: M
authors.lastname: Grilli