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arXiv · 1302.0737

Electrostatic tailoring of magnetic interference in quantum point contact ballistic Josephson junctions

M. Amado·A. Fornieri·F. Carillo·G. Biasiol·L. Sorba·V. Pellegrini·F. Giazotto
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Abstract

The magneto-electrostatic tailoring of the supercurrent in quantum point contact ballistic Josephson junctions is demonstrated. An etched InAs-based heterostructure is laterally contacted to superconducting niobium leads and the existence of two etched side gates permits, in combination with the application of a perpendicular magnetic field, to modify continuously the magnetic interference pattern by depleting the weak link. For wider junctions the supercurrent presents a Fraunhofer-like interference pattern with periodicity h/2e whereas by shrinking electrostatically the weak link, the periodicity evolves continuously to a monotonic decay. These devices represent novel tunable structures that might lead to the study of the elusive Majorana fermions.

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M. Amado, A. Fornieri, F. Carillo, G. Biasiol, L. Sorba, V. Pellegrini, F. Giazotto. 2013-02-04. Electrostatic tailoring of magnetic interference in quantum point contact ballistic Josephson junctions. https://doi.org/10.1103/physrevb.87.134506

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