Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-02
Phys. Rev. B 80, 220507(R) (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 5 figures, title modified
Scientific paper
10.1103/PhysRevB.80.220507
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.
Borghs Gustaaf
Otto Florian
Richter Katrin
Rohlfing F.
Strunk Ch
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