Selective focusing of electrons and holes in a graphene-based superconducting lens
arXiv:1204.2096 · doi:10.1103/PhysRevB.85.115411
Abstract
We show that a graphene pnp junction with a central superconducting electrode acts as a Veselago lens for incoming electrons by focusing them and their phase-conjugated counterpart (holes) into different points of the optical axis. This selective focusing suggested by a simple trajectory analysis is confirmed by fully microscopic calculations. Although the focusing pattern is degraded by deviations from the ideal conditions we show that it remains visible for a wide range of parameters. We discuss how this property can be useful for the detection of entangled electron pairs.
7 pages, 4 figures
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