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Supercurrents through gated superconductor-normal-metal-superconductor contacts: the Josephson-transistor | | D. Kuhn
; N. M. Chtchelkatchev
; G. B. Lesovik
; G. Blatter
; | | Date: |
16 Dec 2000 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Affiliation: | ETH-Honggerberg, Landau Inst. for Theor. Phys. | | 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 $mu_{x0}$ to the points where electron- and hole-like resonances cross, we find sharp peaks in $I_{
m c}$, resulting in a transitor effect. We compare the performance of this Resonant Josephson-Transistor (RJT) with that of a Superconducting Single Electron Transistor (SSET). | | Source: | arXiv, cond-mat/0101248 | | Services: | Forum | Review | PDF | Favorites | |
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