Pseudogap formation in an electronic system withd-wave attraction at low density
Takashi Hotta, Matthias Mayr, Elbio R. Dagotto
On the basis of an electronic model with separable attractive interaction, the precursors at high temperature and strong coupling of the d-wave superconducting state are investigated in the one-particle spectral function $A(\mathbf{k},\ensuremath{\omega})$ and the total density of states $\ensuremath{\rho}(\ensuremath{\omega}),$ with the use of the self-consistent t-matrix approximation. In the low-density region, it is found that a gaplike structure at the Fermi level appears in $A(\mathbf{k},\ensuremath{\omega})$ and $\ensuremath{\rho}(\ensuremath{\omega})$ above the superconducting transition temperature. It is shown that the pseudogap energy scale is determined by the binding energy of the Cooper pair.
arXiv:cond-mat/9903208•Physical review. B, Condensed matter•Nov 1, 1999•44 citations