Extended Data Fig. 8: Landau level tomography.
From: Mapping the twist-angle disorder and Landau levels in magic-angle graphene
a, Slices of the 3D dataset \({B}_{z}^{{\rm{ac}}}(x,y,{V}_{{\rm{bg}}})\) along various planes for device A. The bright signals denote the 2D manifolds tracing the incompressible states. The black lines trace the N = −4 incompressible manifold used to determine ns(x, y) and θ(x, y). It separates fourfold degenerate Landau levels below it from an eightfold degenerate Landau level above it (wide dark blue band). The region in the centre of the sample that shows no Landau levels corresponds to the grey-blue area in Fig. 3b where no MATBG physics is resolved. b, Representative horizontal slices of the data from Supplementary Video 1 showing the evolution of the Landau levels with Vbg. c, As in a, for device B. For the range of gate voltages shown, εF lies in the p dispersive band for the entire sample. The black lines show an example of a trace of the incompressible manifold lying above an eightfold degenerate Landau level. d, Representative horizontal slices of the data from Supplementary Video 3. An interactive interface for tomographic visualization of the data is available at ref. 30.
