Extended Data Fig. 2: Transport measurements at T = 300 mK.
From: Mapping the twist-angle disorder and Landau levels in magic-angle graphene
a, Four-probe measurement of Rxx(Vbg) versus Ba in device A using an excitation current of 10 nA with the corresponding traces of the Landau fan diagram at the bottom. The green solid lines show the segments that can be traced in the data and the dotted lines indicate their extrapolation to the origin. b, As in a for device B. The purple colour marks the regions where the Rxx signal was slightly negative.
