Giant Backscattering Peak in Angle-Resolved Andreev Reflection

Beenakker, C. W. J.; Melsen, J. A.; Brouwer, P. W.

Giant Backscattering Peak in Angle-Resolved Andreev Reflection

Authors

Beenakker, C. W. J.

Melsen, J. A.

Brouwer, P. W.

Description

It is shown analytically and by numerical simulation that the angular distribution of Andreev reflection by a disordered normal-metal -- superconductor junction has a narrow peak at the angle of incidence. The peak is higher than the well-known coherent backscattering peak in the normal state, by a large factor G/G_0 (where G is the conductance of the junction and G_0=2e^2/h). The enhanced backscattering can be detected by means of ballistic point contacts.
Instituut-Lorentz, Leiden, The Netherlands, 4 pages, REVTeX-3.0, 3 figures