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Cooper pair cotunneling in single charge transistors with dissipative electromagnetic environment

S. V. Lotkhov·S. A. Bogoslovsky·A. B. Zorin·J. Niemeyer
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Abstract

We observed current-voltage characteristics of superconducting single charge transistors with on-chip resistors of R about R_Q = h/4e^2 = 6.45 kOhm, which are explained in terms of Cooper-pair cotunneling. Both the effective strength of Josephson coupling and the cotunneling current are modulated by the gate-induced charge on the transistor island. For increasing values of the resistance R we found the Cooper pair current at small transport voltages to be dramatically suppressed.

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S. V. Lotkhov, S. A. Bogoslovsky, A. B. Zorin, J. Niemeyer. 2003-05-06. Cooper pair cotunneling in single charge transistors with dissipative electromagnetic environment. https://doi.org/10.1103/physrevlett.91.197002

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