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First-order pairing transition and single-particle spectral function in the attractive hubbard model | | M Capone
; C Castellani
; M Grilli
; | | Date: |
25 Mar 2002 | | Journal: | Phys Rev Lett, 88 (12), 126403 | | 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. | | Source: | PubMed, pmid11909485 | | Other source: | [GID 79905] cond-mat/0109194 | | Services: | Forum | Review | Favorites | |
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