Journal
NANOTECHNOLOGY
Volume 24, Issue 24, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/24/24/245201
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Funding
- FP7 program [228464]
- Italian Ministry of Defence through the PNRM project 'TERASUPER'
- FIRB project 'HybridNanoDev' [RBFR1236VV]
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We report the realization of a ballistic Josephson interferometer. The interferometer is made from 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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