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SUMMARY:Conductance anomaly and Zeeman splitting in ballistic hole quantum
  wires - Dr. Romain Danneau (School of Physics\, University of New South W
 ales\, Sydney\, Australia)
DTSTART:20060612T131500Z
DTEND:20060612T141500Z
UID:TALK5114@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:I will present a study of the Zeeman splitting in ballistic ho
 le\nquantum wires formed in a (311)A quantum well by surface gate\nconfine
 ment. Transport measurements clearly show lifting of the spin\ndegeneracy 
 and crossings of the subbands when an in-plane magnetic\nfield B is applie
 d parallel to the wire. When B is oriented\nperpendicular to the wire\, no
  spin-splitting is discernible up to B =\n8.8 T. This anisotropic behavior
  is also measured for the 0.7\nstructure and the zero bias anomaly. The ob
 served large Zeeman\nsplitting anisotropy in our hole quantum wires demons
 trates the\nimportance of quantum-confinement for spin-splitting in\nnanos
 tructures with strong spin-orbit coupling.\n\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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