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DESCRIPTION:Rob Leigh\, University of Illinois\n\nThe effective action enco
ding elastic transport properties of topological insulators involves effec
tive (non-dynamical) 'gravitational' variables. In the case of 2+1-dimensi
onal time-reversal breaking topological insulators\, the leading term in t
he action is a 'Chern-Simons' action involving the torsion of the connecti
on. The coefficient of this term is the dissipationless Hall viscosity\, a
direct analogue of the Hall conductivity. In this talk\, we review the ca
lculation of the Hall viscosity in a simple model\, and discuss its intere
sting renormalization properties.
DTSTART:20110223T203000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Topological Insulators\, Gravity and Torsion
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