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.
Cayssol
J
J
Condensed Matter Theory Group, CPMOH, UMR 5798, Université Bordeaux I, 33405 Talence, France.