Moiré graphene hosts a 7/3 fractional high-Chern insulator
Researchers report a moiré stack made from Bernal bilayer graphene and rhombohedral tetralayer graphene that hosts a family of quantum anomalous Hall states with Chern numbers from 1 to 7 at certain fillings, and, notably, a 7/3 fractional Chern insulator near 2/3 filling. The findings, supported by Hartree-Fock modeling and low-temperature transport measurements, expand lattice-based fractional quantum Hall physics without a magnetic field and establish this moiré platform as a route to exploring anyons.