Angle dependence of Andreev scattering at semiconductor-superconductor interfaces

Publication: Research - peer-reviewJournal article – Annual report year: 1999

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We study the angle dependence of the Andreev scattering at a semiconductor-superconductor interface, generalizing the one-dimensional theory of Blonder, Tinkham, and Klapwijk (BTK),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. [S0163-1829(99)01615-X].
Original languageEnglish
JournalPhysical Review B Condensed Matter
Publication date1999
Volume59
Journal number15
Pages10176-10182
ISSN0163-1829
DOIs
StatePublished

Bibliographical note

Copyright (1999) by the American Physical Society.

CitationsWeb of Science® Times Cited: 54

Keywords

  • METAL, TRANSITION, ENERGY, TINKHAM, REFLECTION, CURRENTS, BLONDER, BOUNDARIES, POINT-CONTACT
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