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Suppression of Josephson currents in ballistic junctions by an injection current

✍ Scribed by A.A. Golubov; K. Neurohr; Th. Schäpers; H. Lüth; M. Behet

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
171 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

Control of the critical current in a superconductor/two-dimensional electron gas Josephson junction by means of an injection current is reported. The control mechanism is explained by a theoretical model, which takes ballistic transport across the junction and diffusive transport through the semiconductor wire structure into account. Measurements on a Nb-AlGaSb/InAs-Nb junction show that the strong suppression of the critical current can, in principle, be explained by the theoretical model. Deviations are due to the nonlinear current-voltage characteristics of the superconductor/two-dimensional electron gas interface and the two-dimensionality of the supercurrent transport.

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