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arXiv:1911.02519 · Journal of Low Temperature Physics

Cooper-Pair Tunneling in Small Josephson Junction Arrays Under Radio-Frequency Irradiation

Godwill Mbiti Kanyolo, Kouichi Takeda, Yoshinao Mizugaki, Takeo Kato, Hiroshi Shimada

Published Jun 12, 2020• 3 citations
arXivHTMLPDF
DOI
10.1007/s10909-020-02486-3

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•Nov 3, 2019•0 citations
The influence of radio frequency microwaves on the Coulomb blockade characteristics in small Josephson junctions was studied using a one-dimensional array of ten small Al tunnel junctions in the frequency range from 1 MHz to 1000 MHz. Coulomb blockade voltage (VthV_{\rm th}Vth​) is diminished with increasing microwave power (VacV_{\rm ac}Vac​), where the VthV_{\rm th}Vth​-VacV_{\rm ac}Vac​ plots for varied frequencies fall on a single curve. We observed and theoretically analyzed a magnetic field dependentdependentdependent renormalization of the applied microwave power, in addition to a magnetic-field independentindependentindependent renormalization effect explained using an effective circuit approach of the array. Due to its high sensitivity to microwave power, the array is well-suited for on-chip detection applications in low temperature environments.