Single-Particle Excitations in a Two-Dimensional Strong-Coupling   Superconductor
  We present calculations of the single-particle excitation spectrum for a 2D strong-coupling superconductor in a conserving approximation. Spectral weight at low frequency is substantially reduced as the superconducting transition is approached from the normal state. The suppression of low-energy excitations is a consequence of Cooper-pair fluctuations that are described self-consistently in the fluctuation exchange approximation. The static and uniform electromagnetic response provides a measure of the super fluid density and a fully self-consistent indication of the superconducting transition temperature. 
D.W. Hess (1), J.J. Deisz (2), and J.W. Serene (3) ((1) Complex   Systems Theory Branch, Naval Research Laboratory, (2) Depa...