Andreev spectroscopy of Josephson coupling
F. W. J. Hekking, L. I. Glazman, Gerd Schön
DOI 10.1103/PhysRevB.51.15312 · Physical Review B
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Abstract
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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