Giant backscattering peak in angle-resolved Andreev reflection

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/${\mathit{G}}_0$ (where G is the conductance of the junction and ${\mathit{G}}_0$=2${\mathit{e}}^2$/h). The enhanced backscattering can be detected by means of ballistic point contacts.