Transport measurements of correlated insulating states in twisted bilayer graphene*

Twisted bilayer graphene (TBG) has emerged as a prominent platform for strongly correlated electrons. When two sheets of monolayer graphene are stacked at an angle near 1.1°, interactions are expected to break the four-fold spin and valley degeneracy resulting in correlated insulating states and superconductivity near densities corresponding to an integer number of electrons per superlattice unit cell [Cao et al., Nature 556, 43–50 (2018), Cao et al., Nature 556, 80–84 (2018)]. Here we present transport measurements studying these correlated states.