Pairing fluctuation effects on the single-particle spectra for the superconducting state

Details Pairing fluctuation effects on the single-particle spectra for the superconducting state Pairing fluctuation effects on the single-particle spectra for the superconducting state

2003-11-18

arxiv.org/abs/cond-mat/0311424v1

Phys. Rev. Lett. 92, 110401 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.110401

Single-particle spectra are calculated in the superconducting state for a fermionic system with an attractive interaction, as functions of temperature and coupling strength from weak to strong. The fermionic system is described by a single-particle self-energy that includes pairing-fluctuation effects in the superconducting state. The theory reduces to the ordinary BCS approximation in weak coupling and to the Bogoliubov approximation for the composite bosons in strong coupling. Several features of the single-particle spectral function are shown to compare favorably with experimental data for cuprate superconductors.

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