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The propagation of Dirac fermions in graphene through a long-period periodicpotential would result in a band folding together with the emergence of aseries of cloned Dirac points (DPs). In highly aligned graphene/hexagonal boronnitride (G/hBN) heterostructures, the lattice mismatch between the two atomiccrystals generates a unique kind of periodic structure known as a moir\'esuperlattice. Of particular interests is the emergent phenomena related to thereconstructed band-structure of graphene, such as the Hofstadter butterfly,topological currents, gate dependent pseudospin mixing, and ballistic minibandconduction. However, most studies so far have been limited to the lower-orderminibands, e.g. the 1st and 2nd minibands counted from charge neutrality, andconsequently the fundamental nature of the reconstructed higher-order minibandspectra still remains largely unknown. Here we report on probing thehigher-order minibands of precisely aligned graphene moir\'e superlattices bytransport spectroscopy. Using dual electrostatic gating, the edges of thesehigh-order minibands, i.e. the 3rd and 4th minibands, can be reached.Interestingly, we have observed interband Landau level (LL) crossinginducinggap closures in a multiband magneto-transport regime, which originates fromband overlap between the 2nd and 3rd minibands. As observed high-orderminibands and LL reconstruction qualitatively match our simulated results. Ourfindings highlight the synergistic effect of minibands in transport, thuspresenting a new opportunity for graphene electronic devices.

High-order minibands and interband Landau level reconstruction in graphene moire superlattice