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

H. Olofsson 1, S. Åberg 1, P. Leboeuf 2

Physical Review Letters 100 (2008) 0370005

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.

  • 1. Mathematical Physics (LTH),
    Lund University
  • 2. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud