Andreev drag effect via magnetic quasiparticle focusing in   normal-superconductor nanojunctions
  We study a new hybrid normal-superconductor (NS) pi-junction in which the non-local current can be orders of magnitude larger than that in earlier proposed systems. We calculate the electronic transport of this NS hybrid when an external magnetic field is applied. It is shown that the non-local current exhibits oscillations as a function of the magnetic field, making the effect tunable with the field. The underlying classical dynamics is qualitatively discussed. 
P. K. Polin\'ak, C. J. Lambert, J. Koltai, and J. Cserti