ar X iv : c on d - m at / 9 41 10 70 v 1 1 7 N ov 1 99 4 Andreev Spectroscopy of Josephson Coupling
نویسنده
چکیده
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. 74.50.+r, 74.20.Fg, 72.10.Bg Typeset using REVTEX
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