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Paper detail

Doppler Shift in Andreev Reflection from a Moving Superconducting Condensate in Nb/InAs Josephson Junctions

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.

preprint2009arXivOpen access
F. RohlfingG. TkachovF. OttoK. RichterD. WeissG. BorghsC. Strunk
cond-mat.mes-hallcond-mat.supr-con
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F. RohlfingG. TkachovF. OttoK. RichterD. WeissG. BorghsC. Strunk

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