Extended Data Fig. 8: Contact width and Hall quantization.
From: Proximity screening greatly enhances electronic quality of graphene
a Hall resistivity ρxy(n) at different B (color-coded curves) for device S1. Hall plateaus emerge below 5 mT. b Magnetic field required for their emergence versus voltage probes’ width (blue symbols). Error bars indicate uncertainties in determining w (from optical micrographs) and the quantization onset. Red curve: Criterion Dc = w. The pink area shows where w exceeds Dc, allowing entry of edge states into ohmic contacts.
