Robust fractional quantum Hall effect in the N=2 Landau level in bilayer graphene
Georgi Diankov, Chi-Te Liang, François Amet, Patrick Gallagher, Menyoung Lee, Andrew J. Bestwick, Kevin Tharratt, William Coniglio, Jan Jaroszynski, Kenji Watanabe, Takashi Taniguchi, David Goldhaber-Gordon.