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1999•Physical review. B, Condensed matterOpen access

Local suppression of Josephson currents in niobium/two-dimensional electron gas/niobium structures by an injection current

K. Neuróhr, Thomas Schäpers, J. Malindretos, S. G. Lachenmann, A. I. Braginski, H. Lüth, M. Behet, G. Borghs, A. A. Golubov

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Abstract

We investigated niobium-AlGaSb/InAs-niobium hybrid structures using a high mobility two-dimensional electron gas as a weak link. The Josephson current observed in this structure was suppressed by an injection current driven into the weak link via an additional normal lead. Using a four-terminal configuration the supercurrent is suppressed all over the weak link. In a three-terminal configuration it was possible to suppress the supercurrent locally.

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What this paper is about

We investigated niobium-AlGaSb/InAs-niobium hybrid structures using a high mobility two-dimensional electron gas as a weak link. The Josephson current observed in this structure was suppressed by an injection current driven into the weak link via an additional normal lead. Using a four-terminal configuration the supercurrent is suppressed all over the weak link. In a three-terminal configuration it was possible to suppress the supercurrent locally.

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Available abstract

We investigated niobium-AlGaSb/InAs-niobium hybrid structures using a high mobility two-dimensional electron gas as a weak link. The Josephson current observed in this structure was suppressed by an injection current driven into the weak link via an additional normal lead. Using a four-terminal configuration the supercurrent is suppressed all over the weak link. In a three-terminal configuration it was possible to suppress the supercurrent locally.

Key concepts: Niobium, Supercurrent, Current (fluid), Josephson effect, Electron, Superconductivity, Materials science, Condensed matter physics

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