Fractional Chern insulator states in twisted bilayer graphene: An analytical approach

This work shows that the character of the narrow band wave functions in twisted bilayer graphene favor the formation of fractional Quantum Hall states even in the absence of a magnetic field. The authors trace the features of magic angle bands to a holomorphic property of the tractable chiral limit which also allows for mapping to a Dirac particle in an inhomogeneous magnetic field and the explicit construction of Laughlin like ground states.