Supercurrents Through Gated Superconductor-Normal-Metal-Superconductor Contacts: the Josephson Transistor
Journal
Physical Review B
ISSN
0556-2805
ISSN-Digital
1550-235X
Type
journal article
Date Issued
2001-02-16
Author(s)
Kuhn, Daniel
;
Chtchelkatchev, Nikolai M.
;
Lesovik, Gordey B.
;
Blatter, Gianni
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).
Language
English
HSG Classification
not classified
Refereed
Yes
Publisher
APS
Publisher place
Ridge, NY
Volume
63
Number
5
Start page
0545200
Subject(s)
Division(s)
Eprints ID
33907