Extended Data Fig. 4: Effect of twist angle inhomogeneity on FCIs.
From: Fractional Chern insulators in magic-angle twisted bilayer graphene
a, Local twist angle variation over a distance of 1.6 µm. b, Compressibility measurements between 𝜈 =3 and 4 measured along the same trajectory as in a at 9 T. The blue and black arrows indicate the densities near which the (2/3, 10/3) and (1/3, 11/3) states occur, respectively. c, Compressibility measurements taken at three locations indicated by the dotted lines in a. The white, blue, black and green dotted lines mark the expected evolution of the incompressible peaks associated with (1, 3), (2/3, 10/3), (1/3, 11/3) and (1, 13/4).
