Microscopic theory of Cooper pair beam splitters based on carbon nanotubes
P. Burset, W. J. Herrera, A. Levy Yeyati
DOI 10.1103/PhysRevB.84.115448 · Physical Review B
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Abstract
We analyze microscopically a Cooper pair splitting device in which a central superconducting lead is connected to two weakly coupled normal leads through a carbon nanotube. We determine the splitting efficiency at resonance in terms of geometrical and material parameters, including the effect of spin-orbit scattering. While the efficiency in the linear regime is limited to 50% and decays exponentially as a function of the width of the superconducting region, we show that it can rise to ∼100% in the nonlinear regime for certain regions of the stability diagram.
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