Scientific Achievement

Observed high-order Brown-Zak (BZ) oscillations in magnetotransport of graphene/BN superlattices with ultra-high electron and hole densities.

Significance and Impact

The development of a new electron beam method to achieve ultra-high doping (electron or hole) in graphene/BN superlattices leads to quantum states at modest magnetic fields, opening up ultra-high hole doping for general transport

Research Details

  • Revealed high-order BZ fractal quantum oscillations
  • Quantified experimentally and theoretically electron-hole asymmetries
  • Complementary theoretical calculations agree with experiment

Publication Details

Shi, S. Kahn, N. Leconte, T. Taniguchi, K. Watanabe, M. Crommie, J. Jung, A. Zettl, Phys. Rev. Lett. 130, 186204 (2023). 

DOI: 10.1103/PhysRevLett.130.188202