Crossed Andreev reflection in a graphene bipolar transistor.
We investigate the crossed Andreev reflections between two graphene leads connected by a narrow superconductor. When the leads are, respectively, of the n and p type, we find that electron elastic cotunneling and local Andreev reflection are both eliminated even in the absence of any valley-isospin or spin polarizations. We further predict oscillations of both diagonal and cross conductances as a function of the distance between the graphene-superconductor interfaces.
Condensed Matter Theory Group, CPMOH, UMR 5798, Université Bordeaux I, 33405 Talence, France.
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