Physics – Condensed Matter – Superconductivity
Scientific paper
1998-07-03
Phys. Rev. B 59, 10176 (1999).
Physics
Condensed Matter
Superconductivity
8 pages including 3 figures (revised, 6 references added)
Scientific paper
10.1103/PhysRevB.59.10176
We study the angle dependence of the Andreev scattering at a semiconductor-superconductor interface, generalizing the one-dimensional theory of Blonder, Tinkham and Klapwijk. An increase of the momentum parallel to the interface leads to suppression of the probability of Andreev reflection and increase of the probability of normal reflection. We show that in the presence of a Fermi velocity mismatch between the semiconductor and the superconductor the angles of incidence and transmission are related according to the well-known Snell's law in optics. As a consequence there is a critical angle of incidence above which only normal reflection exists. For two and three-dimensional interfaces a lower excess current compared to ballistic transport with perpendicular incidence is found. Thus, the one-dimensional BTK model overestimates the barrier strength for two and three-dimensional interfaces.
Flensberg Karsten
Jauho Antti-Pekka
Mortensen Niels Asger
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