Crossed Andreev reflection in a graphene bipolar transistor
arXiv:0801.2292 · doi:10.1103/PhysRevLett.100.147001
Abstract
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.
4 pages, 4 figures. Accepted in Physical Review Letters