Photon-assisted Tunneling In Double-barrier Superconducting Tunnel-junctions

M. M. T. M. Dierichs; P. Dieleman; J. J. Wezelman; C. E. Honingh; T. M. Klapwijk

doi:10.1063/1.110996

Photon-assisted Tunneling In Double-barrier Superconducting Tunnel-junctions

M. M. T. M. Dierichs, P. Dieleman, J. J. Wezelman, C. E. Honingh, T. M. Klapwijk

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Abstract

Double-barrier Nb/Al2O3/Al/Al2O3/Nb tunnel junctions are used as mixing elements in a 345 GHz waveguide mixer. Noise temperatures (double side band) down to 720 K at 3.0 K are obtained without the need to apply a magnetic field to suppress the Josephson current. It is shown that the composite barrier acts as a single barrier for photon-assisted tunneling. Surprisingly, at these frequencies the capacitance of two stacked tunnel barriers is only determined by one barrier.

Original language	English
Pages (from-to)	921-923
Number of pages	3
Journal	Applied Physics Letters
Volume	64
Issue number	7
DOIs	https://doi.org/10.1063/1.110996
Publication status	Published - 14-Feb-1994

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Photon‐assisted tunneling in double‐barrier superconducting tunnel junctionsFinal publisher's version, 525 KBLicence: Unspecified

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abstract = "Double-barrier Nb/Al2O3/Al/Al2O3/Nb tunnel junctions are used as mixing elements in a 345 GHz waveguide mixer. Noise temperatures (double side band) down to 720 K at 3.0 K are obtained without the need to apply a magnetic field to suppress the Josephson current. It is shown that the composite barrier acts as a single barrier for photon-assisted tunneling. Surprisingly, at these frequencies the capacitance of two stacked tunnel barriers is only determined by one barrier.",

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AU - Honingh, C. E.

AU - Klapwijk, T. M.

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AB - Double-barrier Nb/Al2O3/Al/Al2O3/Nb tunnel junctions are used as mixing elements in a 345 GHz waveguide mixer. Noise temperatures (double side band) down to 720 K at 3.0 K are obtained without the need to apply a magnetic field to suppress the Josephson current. It is shown that the composite barrier acts as a single barrier for photon-assisted tunneling. Surprisingly, at these frequencies the capacitance of two stacked tunnel barriers is only determined by one barrier.

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