Supercurrent force on Andreev-reflected quasiparticles and excess currents
B. Götzelmann, S. Hofmann, R. Kümmel
DOI 10.1103/PhysRevB.52.R3848 · Physical Review B
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Abstract
The current-carrying condensate of a superconductor exerts a force parallel to the current direction on Andreev-reflected quasiparticles. As a consequence, in a point contact on a normal-metal–superconductor junction the excess current due to Andreev reflections from the supercurrent-carrying layer is predicted to decrease with increasing Cooper pair momentum ps. The supercurrent force can be compensated, and thus directly measured, by a weak applied external field Ba⊥ps in the normal metal of thickness l: Analytical and numerical computations of quasiparticle-wave-packet trajectories show that the excess current as a function of ps and Ba is maximum when Ba=Bac≡ps/le.
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