Gaussian fluctuation corrections to the BCS mean field gap amplitude at zero temperature

Details Gaussian fluctuation corrections to the BCS mean field gap amplitude at zero temperature Gaussian fluctuation corrections to the BCS mean field gap amplitude at zero temperature

2002-07-07

arxiv.org/abs/cond-mat/0207190v3

Physics

Condensed Matter

Strongly Correlated Electrons

New author added. Incorrect calculations of previous version corrected and conclusions revised Rev 2: New references added, mi

Scientific paper

The leading (Gaussian) fluctuation correction to the weak coupling zero temperature BCS superconducting gap equation is computed. We find that the dominant contribution comes from the high energies and momenta (compared to the gap) and gives a correction smaller by the weak-coupling factor $gN_0$ than the mean-field terms. This correction is small due to cancellation of singular contributions from the amplitude and phase mode at high energies and momenta.

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