Mesoscopic Conductance Oscillations in a Normal Sample Controlled by the Superconductivity of an NS Boundary

Abstract

An arrangement of mesoscopic experiments is considered when the conductance of a mesoscopic normal metal sample is governed not only by the magnetic flux threading the sample but by the supercurrent inside the superconductor coupled to the normal metal sample as well. The conductance of the system is shown to be associated with the SNS Josephson current $j_J$ through the normal part of the system. By way of example we consider a model when quasi1D wire is connected to a superconductor by its ends and coupled to two reservoirs of electrons by the normal metallic leads. The conductance oscillations caused by change of magnetic field and the supercurrent inside the superconductor have been calculated. The possibility of direct observation of the Josephson current through measurement of the thermal noise in the normal conductor is suggested.