Semiclassical Theory of Bardeen-Cooper-Schrieffer Pairing-Gap Fluctuations

Details Semiclassical Theory of Bardeen-Cooper-Schrieffer Pairing-Gap Fluctuations Semiclassical Theory of Bardeen-Cooper-Schrieffer Pairing-Gap Fluctuations

2007-04-18

arxiv.org/abs/0704.2310v3

Phys. Rev. Lett. 100, 037005 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.100.037005

Superfluidity and superconductivity are genuine many-body manifestations of quantum coherence. For finite-size systems the associated pairing gap fluctuates as a function of size or shape. We provide a parameter free theoretical description of pairing fluctuations in mesoscopic systems characterized by order/chaos dynamics. The theory accurately describes experimental observations of nuclear superfluidity (regular system), predicts universal fluctuations of superconductivity in small chaotic metallic grains, and provides a global analysis in ultracold Fermi gases.

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