Tunable Strongly Correlated Band Insulator
  We introduce the notion of the strongly correlated band insulator (SCI), where the lowest energy excitations are collective modes (excitons) rather than the single particles. We construct controllable 1/N expansion for SCI to describe their observables properties. A remarkable example of the SCI is bilayer graphene which is shown to be tunable between the SCI and usual weak coupling regime. 
V.V. Cheianov, I.L. Aleiner, and V.I. Fal'ko
cond-mat.str-el cond-mat.mes-hall