Extended Data Fig. 5: dI/dV on an AB site and on an AA site in a magnetic field.
From: Cascade of electronic transitions in magic-angle twisted bilayer graphene
a, dI/dV spectra acquired at the centre of an AB region in 1.05° MATBG in device B (Vg = 38 V to −40 V). These data are the same as those shown in main text Fig. 3a and clearly show gate-dependent oscillations in the remote bands. Sequential curves are vertically offset by 1 nS for clarity. b, dI/dV curves acquired at the centre of a nearby AA site at zero magnetic field (initial tunnelling parameters: Vb = −150 mV, I = 0.5 nA, 4.121 kHz sinusoidal modulation of Vrms = 1 mV). Sequential curves are vertically offset by 10 nS for clarity. c, dI/dV(Vb, Vg) measured at the centre of the same AA site as in b at zero magnetic field. d, dI/dV(Vb, Vg) measured at the centre of an AA site at B⊥ = 9 T (initial tunnelling parameters for c and d: Vb = −100 mV, I = 0.5 nA, 4.121 kHz sinusoidal modulation of Vrms = 0.6 mV). The out-of-plane magnetic field suppresses the cusps at integer ν and strongly modifies the cascade features near EF. This suggests that a perpendicular field may change the localized nature of electrons in the flat bands; Landau quantization of the remote bands may also change their interactions with the flat bands.
