Rohlfing, F. and Tkachov, G. and Otto, F. and Richter, K. and Weiss, D. and Borghs, G. and Strunk, C. (2009) Doppler shift in Andreev reflection from a moving superconducting condensate in Nb/InAs Josephson junctions. PHYSICAL REVIEW B, 80 (22): 220507. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ENERGY-GAP STRUCTURE; SUPERCURRENT; QUANTIZATION; CURRENTS; ballistic transport; critical currents; Doppler shift; III-V semiconductors; indium compounds; Josephson effect; metal-insulator boundaries; niobium; semiconductor quantum wells |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Aug 2020 10:12 |
| Last Modified: | 31 Aug 2020 10:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28086 |
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