Quasiclassical Green's function approach to mesoscopic superconductivity
Wolfgang Belzig, Frank K. Wilhelm, Christoph Bruder, Gerd Schön, Andrei D. Zaikin
Abstract
Recent experiments on mesoscopic normal-metal--superconductor heterostructures resolve properties on length scales and at low temperatures such that the temperature is below the Thouless energy kB T ETh. We describe the properties of these systems within the framework of quasiclassical many-body techniques. Diffusive and ballistic systems are covered, both in equilibrium and nonequilibrium situations. Thereby we demonstrate the common physical basis of various subtopics.
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