Login / Signup

Fractional and Symmetry-Broken Chern Insulators in Tunable Moiré Superlattices.

Bin ChengCheng PanShi ChePeng WangYong WuKenji WatanabeTakashi TaniguchiSupeng GeRoger LakeDmitry SmirnovChun Ning LauMarc Bockrath
Published in: Nano letters (2019)
We study dual-gated graphene bilayer/hBN moiré superlattices. Under zero magnetic field, we observe additional resistance peaks as the charge density varies. The peaks' resistivities vary approximately quadratically with an applied perpendicular displacement field D. Data fit to a continuum model yield a bilayer/hBN interaction energy scale ∼30 ± 10 meV. Under a perpendicular magnetic field, we observe Hofstadter butterfly spectra as well as symmetry-broken and fractional Chern insulator states. Their topology and lattice symmetry breaking is D-tunable, enabling the realization of new topological states in this system.
Keyphrases
  • energy transfer
  • big data
  • room temperature
  • light emitting
  • molecular dynamics
  • artificial intelligence