Extended Data Fig. 6: Onset of SdH oscillations in different proximity-gated devices.
From: Proximity screening greatly enhances electronic quality of graphene
a, c, e Maps ρxx(n,B) near the NP for devices S2, S3 and S4 (white-to-blue scales: 0 to 40, 25 and 3 kΩ, respectively). b, d, f Horizontal cuts from the maps above. All measurements at ∼2 K. Note that the early SdH oscillations appear superimposed on the pronounced resistivity peak at the NP, creating a broad dark region below a few mT in the color maps a, c, e that obscures the onset of Landau quantization. The onset becomes apparent at lower fields using horizontal cuts as in b, d, f.
