Cooper pair cotunneling in single charge transistors with dissipative electromagnetic environment
S. V. Lotkhov, S. A. Bogoslovsky, A. B. Zorin, J. Niemeyer
Abstract
We observed current-voltage characteristics of superconducting single charge transistors with on-chip resistors of R about RQ = h/4e2 = 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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