Physics – Condensed Matter – Superconductivity
Scientific paper
2008-01-23
Physical Review Letters 101 087002 (2008)
Physics
Condensed Matter
Superconductivity
Published version; 4+ pages, 3 figures
Scientific paper
10.1103/PhysRevLett.101.087002
Non-dissipative Josephson current through nanoscale superconducting constrictions is carried by spectroscopically sharp energy states, so-called Andreev bound 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.
Fogelstrom Mikael
Lofwander Tomas
Shumeiko Vitaly S.
Skoldberg Jonas
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