@article{10626,
  abstract     = {Owing to their wide tunability, multiple internal degrees of freedom, and low disorder, graphene heterostructures are emerging as a promising experimental platform for fractional quantum Hall (FQH) studies. Here, we report FQH thermal activation gap measurements in dual graphite-gated monolayer graphene devices fabricated in an edgeless Corbino geometry. In devices with substrate-induced sublattice splitting, we find a tunable crossover between single- and multicomponent FQH states in the zero energy Landau level. Activation gaps in the single-component regime show excellent agreement with numerical calculations using a single broadening parameter 
Γ≈7.2K. In the first excited Landau level, in contrast, FQH gaps are strongly influenced by Landau level mixing, and we observe an unexpected valley-ordered state at integer filling ν=−4.},
  author       = {Polshyn, Hryhoriy and Zhou, H. and Spanton, E. M. and Taniguchi, T. and Watanabe, K. and Young, A. F.},
  issn         = {1079-7114},
  journal      = {Physical Review Letters},
  keywords     = {general physics and astronomy},
  number       = {22},
  publisher    = {American Physical Society},
  title        = {{Quantitative transport measurements of fractional quantum Hall energy gaps in edgeless graphene devices}},
  doi          = {10.1103/physrevlett.121.226801},
  volume       = {121},
  year         = {2018},
}