Abstract
We report the realization of a ballistic Josephson interferometer. The
interferometer is made by a quantum ring etched in a nanofabricated
two-dimensional electron gas confined in an InAs-based heterostructure
laterally contacted to superconducting niobium leads. The Josephson current
flowing through the structure shows oscillations with h/e flux periodicity when
threading the loop with a perpendicular magnetic field. This periodicity, in
sharp contrast with the h/2e one observed in conventional dc superconducting
quantum interference devices, confirms the ballistic nature of the device in
agreement with theoretical predictions. This system paves the way for the
implementation of interferometric Josephson pi-junctions, and for the
investigation of Majorana fermions.
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