Andreev Reflection at High Magnetic Fields: Evidence for Electron and Hole Transport in Edge States
J. Eroms, D. Weiss, J. De Boeck, G. Borghs, U. Zülicke
DOI 10.1103/PhysRevLett.95.107001 · Physical Review Letters
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Abstract
We have studied magnetotransport in arrays of niobium filled grooves in an InAs/AlxGa1−xSb heterostructure. The critical field of up to 2.6 T permits one to enter the quantum Hall regime. In the superconducting state, we observe strong magnetoresistance oscillations, whose amplitude exceeds the Shubnikov–de Haas oscillations by a factor of about 2, when normalized to the background. Additionally, we find that above a geometry-dependent magnetic field value the sample in the superconducting state has a higher longitudinal resistance than in the normal state. Both observations can be explained with edge channels populated with electrons and Andreev-reflected holes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | Pressure not reported | unknown |
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