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Localized electrons subject to applied magnetic fields can restart topropagate freely through the lattice in delocalized magnetic Bloch states(MBSs) when the lattice periodicity is commensurate with the magnetic length.Twisted graphene superlattices with moir\'e wavelength tunability enableexperimental access to the unique delocalization in a controllable fashion.Here we report the observation and characterization of high-temperatureBrown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity,originating from the generation of integer and fractional MBSs, in the twistedbilayer and trilayer graphene superlattices, respectively. Coexistingperiodic-in-1/B oscillations assigned to different moir\'e wavelengths, aredramatically observed in small-angle twisted bilayer graphene, which may arisefrom angle-disorder-induced in-plane heteromoir\'e superlattices. Moreover, thevertical stacking of heteromoir\'e supercells in double-twisted trilayergraphene results in a mega-sized superlattice. The exotic superlatticecontributes to the periodic-in-B oscillation and dominates the magnetic Blochtransport.

Heteromoir\'e Engineering on Magnetic Bloch Transport in Twisted Graphene Superlattices