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

Abstract

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.

4 pages, 2 figures

References in corpus (1)

• Superfluid Expansion of a Strongly Interacting Fermi Gas

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