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SUMMARY:Superconductor proximity effects in half-metallic ferromagnets - P
 rof Piet Brouwer\, FU Berlin
DTSTART:20110303T141500Z
DTEND:20110303T151500Z
UID:TALK28917@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:Because of the complete absence of minority carriers in a half
  metal\,\nAndreev reflection is not possible at the interface between a ha
 lf metal and an s-wave superconductor\, unless the spin-rotation symmetry 
 around the magnetization axis in the half metal is broken. In that case An
 dreev reflection can take place through the "triplet proximity effect"\, f
 irst predicted by Bergeret\, Volkov and Efetov. In this talk\, I'll consid
 er the effectiveness of various sources of the spatially nonuniform magnet
 ization and discuss differences between serial and lateral contacts betwee
 n the half metal and the superconductor. In particular\, I show a lateral 
 half-metal--superconductor contact may become a perfect triplet Andreev re
 flector and that the system supports localized Majorana end states in this
  limit.\n\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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