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We propose a platform for flat Chern band by subjecting two-dimensional Diracmaterials -- such as graphene and topological insulator thin films -- to aperiodic magnetic field, which can be created by the vortex lattice of atype-II superconductor. As a generalization of the $n=0$ Landau level, the flatband of Dirac fermion under a nonuniform magnetic field remains at zero energy,exactly dispersionless and topologically protected, while its local density ofstates is spatially modulated due to the magnetic field variation. In thepresence of short-range repulsion, we find fractional Chern insulators emergeat filling factors $\nu=1/m$, whose ground states are generalized Laughlinwavefunctions. We further argue that generalized Wigner crystals may emerge atcertain commensurate fillings under a highly nonuniform magnetic field in theform of a flux line lattice.

Dirac electron under periodic magnetic field: Platform for fractional Chern insulator and generalized Wigner crystal