Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-01-16
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
to appear in PRB, 11 pages, 9 figures
Scientific paper
10.1103/PhysRevB.63.054520
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 $\mu_{x0}$ to the points where electron- and hole-like resonances cross, we find sharp peaks in $I_{\rm c}$, resulting in a transitor effect. We compare the performance of this Resonant Josephson-Transistor (RJT) with that of a Superconducting Single Electron Transistor (SSET).
Blatter Gianni
Chtchelkatchev Nikolay M.
Kühn Daniela
Lesovik Gordey B.
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