Microscopic theory of Cooper pair beam splitters based on carbon nanotubes

Details Microscopic theory of Cooper pair beam splitters based on carbon nanotubes Microscopic theory of Cooper pair beam splitters based on carbon nanotubes

2011-04-15

arxiv.org/abs/1104.3130v1

Phys. Rev. B 84, 115448 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

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 decay exponentially as a function of the width of the superconducting region we show that it can rise up to $\sim 100%$ in the non-linear regime for certain regions of the stability diagram.

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