Phase controlled mesoscopic ring interferometer
Petrashov V.T., Antonov V.N., Delsing P., Claeson ô.
We report measurements of conductance oscillations in a normal metal mesoscopic ring to which a superconducting wire is attached at two points. The osculations are due to phase transfer from the superconducting condensate to normal electrons via Andreev reflections at the normal metal/superconductor interfaces. The phase difference between the interfaces was controlled by varying a sub-critical current through the superconductor and, alternatively, by applied magnetic field. New components were found in the spectrum of oscillations.