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SUMMARY:Scattering theory of topological insulators and superconductors - 
 Anton Akhmerov\, University of Leiden
DTSTART:20120618T100000Z
DTEND:20120618T110000Z
UID:TALK38583@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:Topological insulators and superconductors are characterized b
 y an\ninsulating bulk and protected edge states at the Fermi level. The nu
 mber of these edge states is a topological invariant. Although the\ntopolo
 gical invariant is a Fermi level property\, the existing Hamiltonian expre
 ssions for the invariant require knowledge of the\nfull spectrum below the
  Fermi level. We have recently developed an alternative formulation\, for 
 which it is sufficient to know the scattering matrix of the system at the 
 Fermi level. This scattering theory is on the one hand more efficient than
  the Hamiltonian approach\, and on the other hand directly applies to tran
 sport properties of topological insulators.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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