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arXiv:1109.2753 · Journal of Magnetism and Magnetic Materials

Spectrum of Andreev bound states in Josephson junctions with a ferromagnetic insulator

Shiro Kawabata, Yukio Tanaka, Alexander A. Golubov, Andrey S. Vasenko, Yasuhiro Asano

Published Feb 25, 2012• 10 citations
arXivHTMLPDF
DOI
10.1016/j.jmmm.2012.02.067

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Nondissipative Josephson current through nanoscale superconducting constrictions is carried by spectroscopically sharp energy states, the so-called Andreev states. Although theoretically predicted almost 40 years ago, no direct spectroscopic evidence of these Andreev bound states exists to date. We propose a novel type of spectroscopy based on embedding a superconducting constriction, formed by a single-level molecule junction, in a microwave QED cavity environment. In the electron-dressed cavity spectrum we find a polariton excitation at twice the Andreev bound state energy, and a superconducting-phase-dependent ac Stark shift of the cavity frequency. Dispersive measurement of this frequency shift can be used for Andreev bound state spectroscopy.