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Resonant tunneling through a macroscopic charge state in a superconducting SET transistor

D. V. Averin·A. N. Korotkov·A. J. Manninen·J. P. Pekola
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Abstract

We predict theoretically and observe in experiment that the differential conductance of a superconducting SET transistor exhibits a peak which is a complete analogue in a macroscopic system of a standard resonant tunneling peak associated with tunneling through a single quantum state. In particular, in a symmetric transistor, the peak height is universal and equal to $e^2/2π\hbar$. Away from the resonance we clearly observe the co-tunneling current which in contrast to the normal-metal transistor varies linearly with the bias voltage.

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D. V. Averin, A. N. Korotkov, A. J. Manninen, J. P. Pekola. 1997-01-30. Resonant tunneling through a macroscopic charge state in a superconducting SET transistor. https://doi.org/10.1103/physrevlett.78.4821

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