Chiral symmetry breaking in bilayer graphene

Abstract:  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. 

Faculty host: Ganpathy Murthy