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