Emergent Electromagnetism in Bilayer Graphene

Recently, atomically at layers of carbon known as graphene have raised signicant interest due to many unusual properties. In single layers of graphene, the energy dispersion mimics that of massless Dirac electrons. Here we focus on bilayer graphene (BLG), where for typical Fermi wave vectors the behavior of electrons is that of pseudospin-carrying chiral fermions having a nite band mass but zero rest energy. Using group theory we have established a complete description of magnetoelectric eects in BLG. We show that the type of electromagnetism experienced by electrons in BLG is even more counter-intuitive than the other currently known electronic features of these systems. Work done in collaboration with U. Zülicke, Victoria University of Wellington, New Zealand.