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Article overview
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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: | Forum | Review | PDF | Favorites | |
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1 review found:
(To access fulltext of a review, click on titles below.)
1. Science-advisor.net review 05090019 (2 readers) 
Rate this comment. |  | | | Review title: |
Question about the first order transition | | Reviewer: |
reviewer20 | | Date: |
23 September 2005 at 14:02 GMT. | | Comment: | My main problem concerning this article is about the existence of the first-order transition. Since it is well-known that first order transitions may reveal the failure of self-consistent or mean-field approaches. One can doubt about the fact that the pairing transition is first order since DMFT is a mean-field theory. It would nice to have a confirmation of simulations or other methods. Maybe someone could mention some references in the forum section. |
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