Diagrammatic method of integration over the unitary group, with applications to quantum transport in mesoscopic systems

Abstract

A diagrammatic method is presented for averaging over the circular ensemble of random-matrix theory. The method is applied to phase-coherent conduction through a chaotic cavity (a ``quantum dot'') and through the interface between a normal metal and a superconductor.Comment: 37 pages RevTeX, 21 postscript figures include