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

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

1998-08-24

arxiv.org/abs/cond-mat/9808267v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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.

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