Long-range ballistic transport of Brown-Zak fermions in graphene superlattices

  title={Long-range ballistic transport of Brown-Zak fermions in graphene superlattices},
  author={J. Barrier and P. Kumaravadivel and Roshan Krishna Kumar and L. Ponomarenko and N. Xin and M. Holwill and Ciaran Mullan and M. Kim and R. Gorbachev and M. D. Thompson and J. R. Prance and T. Taniguchi and K. Watanabe and I. Grigorieva and K. Novoselov and A. Mishchenko and V. Fal’ko and A. K. Geim and A. I. Berdyugin},
  journal={Nature Communications},
  • J. Barrier, P. Kumaravadivel, +16 authors A. I. Berdyugin
  • Published 2020
  • Physics, Medicine
  • Nature Communications
  • In quantizing magnetic fields, graphene superlattices exhibit a complex fractal spectrum often referred to as the Hofstadter butterfly. It can be viewed as a collection of Landau levels that arise from quantization of Brown-Zak minibands recurring at rational (p/q) fractions of the magnetic flux quantum per superlattice unit cell. Here we show that, in graphene-on-boron-nitride superlattices, Brown-Zak fermions can exhibit mobilities above 106 cm2 V−1 s−1 and the mean free path exceeding… CONTINUE READING

    Figures from this paper


    High-order fractal states in graphene superlattices
    • 16
    • PDF
    Evidence for a fractional fractal quantum Hall effect in graphene superlattices
    • 90
    • PDF
    Cloning of Dirac fermions in graphene superlattices
    • 717
    • PDF
    Hofstadter’s butterfly and the fractal quantum Hall effect in moiré superlattices
    • 893
    • PDF
    Ballistic miniband conduction in a graphene superlattice
    • 76
    • PDF