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08 September 2010 |
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First-Order Pairing Transition and Single-Particle Spectral Function in the Attractive Hubbard Model | | M. Capone
; C. Castellani
; M. Grilli
; | | Rating: | Members: 2.83/5 (1 reader) | Visitors: 1/5 (1 visitor) | | Date: |
11 Sep 2001 | | Journal: | Phys. Rev. Lett. 88, 126403 (2002) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | A Dynamical Mean Field Theory analysis of the attractive Hubbard model is carried out. We focus on the normal state upon restricting to solutions where superconducting order is not allowed. Nevertheless a clear first-order pairing transition as a function of the coupling takes place at all the electron densities out of half-filling. The transition occurs between a Fermi liquid, stable for $U < U_c$, and an insulating bound pairs phase for $U > U_c$. The spectral function in the Fermi liquid phase is constituted by a low energy structure around the Fermi level (similar to the Kondo resonance of the repulsive half-filled model), which disappears discontinuously at $U=U_c$, and two high energy features (lower and upper Hubbard bands), which persist in the insulating phase. | | Source: | arXiv, cond-mat/0109194 | | Other source: | [GID 79905] pmid11909485 | | Services: | Article forum | Review this article | Full Text PDF | Add to favorites | 
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