Detection of Valley Polarization in Graphene by a Superconducting Contact
A. R. Akhmerov, C. W. J. Beenakker
DOI 10.1103/PhysRevLett.98.157003 · Physical Review Letters
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Abstract
Because the valleys in the band structure of graphene are related by time-reversal symmetry, electrons from one valley are reflected as holes from the other valley at the junction with a superconductor. We show how this Andreev reflection can be used to detect the valley polarization of edge states produced by a magnetic field. In the absence of intervalley relaxation, the conductance GNS=(2e2/h)(1−cosΘ) of the junction on the lowest quantum Hall plateau is entirely determined by the angle Θ between the valley isospins of the edge states approaching and leaving the superconductor. If the superconductor covers a single edge, Θ=0 and no current can enter the superconductor. A measurement of GNS then determines the intervalley relaxation time.
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. | — | Pressure not reported | unknown |
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