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SUMMARY:Probing the coupling between holes and nuclear spins in GaAs using
  a Landau level diode - Mr Oleh Klochan\, University of New South Wales\, 
 Sydney
DTSTART:20150817T131500Z
DTEND:20150817T141500Z
UID:TALK60414@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Studying the coupling between spins of charge carriers and nuc
 lear spins is a rapidly expanding field due to possible application for qu
 antum information processing.  Although there have been some electrical st
 udies of the hyperfine coupling for holes in GaAs\, most studies probed ho
 les optically in self-assembled quantum dots.\n\nPreviously we compared el
 ectron-nuclear and hole-nuclear spin coupling through the breakdown of the
  quantum Hall effect in a narrow one-dimensional constriction. However\, t
 his method relies on detecting a small change in the sample resistance (<1
 %). In this work we use a much more sensitive technique (a Landau level di
 ode) to detect hole-nuclear spin coupling electrically. Nevertheless we ob
 serve no detectable net nuclear polarization\, indicating that hole-nuclea
 r spin flip-flop processes are suppressed by at least factor of 50 compare
 d to GaAs electron systems.\n
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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