Pairing and Superconductivity from weak to strong coupling in the Attractive Hubbard model

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dc.creatorToschi, A.
dc.creatorBarone, P.
dc.creatorCapone, M.
dc.creatorCastellani, C.
dc.date2004-11-25
dc.date.accessioned2026-07-07T08:22:25Z
dc.date.available2026-07-07T08:22:25Z
dc.descriptionThe finite-temperature phase diagram of the attractive Hubbard model is studied by means of the Dynamical Mean Field Theory. We first consider the normal phase of the model by explicitly frustrating the superconducting ordering. In this case we obtain a first-order pairing transition between a metallic phase and a paired phase formed by strongly coupled incoherent pairs. The transition line ends in a finite temperature critical point, but a crossover between two qualitatively different solutions still occurs at higher temperature. Comparing the superconducting and the normal phase solutions, we find that the superconducting instability always occurs before the pairing transition in the normal phase takes place, i.e., $T_c > T_{pairing}$. Nevertheless, the high-temperature phase diagram at $T > T_c$ is still characterized by a crossover from a metallic phase to a preformed pair phase. We characterize this crossover by computing different observables that can be used to identify the pseudogap region, like the spin susceptibility, the specific heat and the single-particle spectral function.
dc.description10 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0411637
dc.identifierhttp://arxiv.org/abs/cond-mat/0411637
dc.identifierNew Journal of Physics 7, 7 (2005)
dc.identifierdoi:10.1088/1367-2630/7/1/007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135648
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titlePairing and Superconductivity from weak to strong coupling in the Attractive Hubbard model
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