Andreev Spectroscopy of Josephson Coupling

Details Andreev Spectroscopy of Josephson Coupling Andreev Spectroscopy of Josephson Coupling

1994-11-17

arxiv.org/abs/cond-mat/9411070v1

Physics

Condensed Matter

9 pages REVTEX , 2 figures available upon request

Scientific paper

10.1103/PhysRevB.51.15312

It is shown that the low energy spectrum of mesoscopic superconductors coupled by Josephson interaction can be probed by two-electron tunneling from a normal electrode. The Andreev reflection in the NS junction of a normal-superconductor-superconductor double junction (NSS transistor) provides a unique spectroscopic tool to probe the coherent Cooper pair tunneling and the energy spectrum of the Josephson (SS) junction. The ground state properties are reflected in a resonant structure of the linear conductance; excited states with an energy as low as the Josephson coupling energy lead to a threshold in the nonlinear $I$-$V$ characteristic.

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