Universal gap fluctuations in the superconductor proximity effect
arXiv:cond-mat/0006375 · doi:10.1103/PhysRevLett.86.874
Abstract
Random-matrix theory is used to study the mesoscopic fluctuations of the excitation gap in a metal grain or quantum dot induced by the proximity to a superconductor. We propose that the probability distribution of the gap is a universal function in rescaled units. Our analytical prediction for the gap distribution agrees well with exact diagonalization of a model Hamiltonian.