Abstract
We study the opening of transport channels in mesoscopic ballistic superconductor--normal-metal--superconductor Josephson contacts. Determining the quasiparticle excitation spectrum in the normal contact region as a function of gate voltage, we discuss the transformation of the electronic levels into phase-sensitive Andreev levels with increasing chemical potential. The opening of these superchannels leads to a supercurrent quantization that exhibits nonuniversal behavior in general, and we discuss its dependence on the junction parameters.
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