Single-Particle Excitations in a Two-Dimensional Strong-Coupling Superconductor

Hess, D. W.; Deisz, J. J.; Serene, J. W.

Single-Particle Excitations in a Two-Dimensional Strong-Coupling Superconductor

Authors

Hess, D. W.

Deisz, J. J.

Serene, J. W.

Description

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.
10 pages and 3 figures (1 color). To appear in Phil. Mag. Lett