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Supercurrents Through Gated Superconductor-Normal-Metal-Superconductor Contacts: the Josephson Transistor

Daniel Kuhn, Nikolai M. Chtchelkatchev, Gordey B. Lesovik & Gianni Blatter

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abstract We analyze the transport through a narrow ballistic superconductor-normal-metal–superconductor Josephson contact with non-ideal transmission at the superconductor–normal-metal interfaces, e.g., due to insulating layers, effective mass steps, or band misfits (SIN interfaces). The electronic spectrum in the normal wire is determined through the combination of Andreev- and normal reflection at the SIN interfaces. Strong normal scattering at the SIN interfaces introduces electron- and hole-like resonances in the normal region which show up in the quasi-particle spectrum. These resonances have strong implications for the critical supercurrent I_c which we find to be determined by the lowest quasi-particle level: tuning the potential µ_{x0} to the points where electron- and hole-like resonances cross, we find sharp peaks in I_c, resulting in a transitor effect. We compare the performance of this Resonant Josephson-Transistor (RJT) with that of a Superconducting Single Electron Transistor (SSET).
   
type journal paper
   
keywords
   
language English
kind of paper journal article
date of appearance 16-1-2001
journal Physical Review B
volume of journal 63
number of issue 5
page(s) 0545200
review double-blind review
   
citation Kuhn, D., Chtchelkatchev, N. M., Lesovik, G. B., & Blatter, G. (2001). Supercurrents Through Gated Superconductor-Normal-Metal-Superconductor Contacts: the Josephson Transistor. Physical Review B, 63(5), 0545200.