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SUMMARY:Topological Insulators: New Phases with a Twist - Dr Rahul Roy\, U
 niversity of Oxford
DTSTART:20091015T131500Z
DTEND:20091015T144500Z
UID:TALK19434@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:Topological insulators are a new class of band insulators with
  topological order. They were originally discovered in the context of a sp
 in version of the quantum Hall effect. The quantization of spin currents i
 s not however a characteristic feature of these\,rather\, it is the existe
 nce of edge states which are robust in the presence of small perturbations
  which preserve time reversal symmetry. In three dimensions I will show th
 at a novel class of topological insulators which have no quantum Hall anal
 og is possible. Recent experiments on\nbismuth antimony alloys and other m
 aterials seem to indicate that this novel phase is realised in these mater
 ials.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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