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Doppler Shift in Andreev Reflection from a Moving Superconducting Condensate in Nb/InAs Josephson Junctions by Rohlfing, F.; Tkachov, G.; Otto, F.; Richter, K.; Weiss, D.; Borghs, G.; Strunk, C. is a scholarly article available to read on EtoBox.

What is Doppler Shift in Andreev Reflection from a Moving Superconducting Condensate in Nb/InAs Josephson Junctions about?

We study narrow ballistic Josephson weak links in a InAs quantum wells contacted by Nb electrodes and find a dramatic magnetic-field suppression of the Andreev reflection amplitude, which occurs even for in-plane field orientation with essentially no magnetic flux through the junction. Our observations demonstrate the presence of a Doppler shift in the energy of the Andreev levels, which results from diamagnetic screening currents in the hybrid Nb/InAs-banks. The data for conductance, excess and critical currents can be consistently explained in terms of the sample geometry and the McMillan energy, characterizing the transparency of the Nb/InAs-interface.

Author

Rohlfing, F.; Tkachov, G.; Otto, F.; Richter, K.; Weiss, D.; Borghs, G.; Strunk, C.

Published

2009

Language

EN