Interaction-dominated transport and Coulomb drag in bilayer graphene

We theoretically investigate interaction effects in transport phenomena in bilayer graphene (BLG). For the minimal conductivity in pristine BLG, we find that the conductivity assumes a constant interaction-limited value for T -> 0, with the first correction being alpha root T. We furthermore study the Coulomb drag resistivity between two BLGs in the whole range from deep within the Fermi-liquid regime all the way to the charge neutrality (CN) point. While in the Fermi-liquid regime drag behaves very similarly to drag in a standard two-dimensional electron gas, in the vicinity of CN we find that the drag resistivity crucially depends on the ratio between inelastic and elastic scattering, as recently found in the case of monolayer graphene. DOI: 10.1103/PhysRevB.87.075423