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22 August 2019
 
  » pubmed » pmid11909485

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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
AbstractA 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
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