"Topological Insulators, Gravity and Torsion"Rob Leigh , University of Illinois [Host: Diana Vaman ]
ABSTRACT:
The effective action encoding elastic transport properties of topological insulators involves effective (nondynamical) 'gravitational' variables. In the case of 2+1dimensional timereversal breaking topological insulators, the leading term in the action is a 'ChernSimons' action involving the torsion of the connection. The coefficient of this term is the dissipationless Hall viscosity, a direct analogue of the Hall conductivity. In this talk, we review the calculation of the Hall viscosity in a simple model, and discuss its interesting renormalization properties.

High Energy Physics Seminar Wednesday, February 23, 2011 3:30 PM Physics Building, Room 204 Note special room. 
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