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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, October 21, 2011
Room 155, Chem-Phys Building

Dr. Allan MacDonald
Department of Physics
University of Texas, Austin

"Chiral symmetry breaking in bilayer graphene''

The band eigenstates of monolayer and bilayer graphene have a type of chiral symmetry which relates momentum to a pseudospin constructed from sublattice degrees of freedom. I will discuss the theory and the recent observation of interaction-induced chiral symmetry breaking in bilayer graphene and explain why this broken symmetry does not occur in monolayer graphene. The bilayer broken symmetry states have interesting momentum-space pseudospin textures which give rise to large Berry curvatures and quantized anomalous Hall effects.

Refreshments will be served in CP 179 at 3:15 PM