Extended Data Fig. 5: No supercurrent in the quantum Hall regime in reference devices.
From: One-dimensional proximity superconductivity in the quantum Hall regime
Left column, schematics of Josephson junctions. Right column, corresponding differential resistance maps at high electron doping n ≈ 3 × 1012cm−2 and L ≈ 200 nm for all the panels. Red curves, critical current. (a) Junction made from Bernal bilayer graphene. W ≈ 1 μm, Iac = 5 nA, T ≈ 50 mK, ΔIdc = 1 nA. (b) Junction with a wrinkle formed in monolayer graphene. The wrinkle’s full width was ≲100 nm as measured by AFM. W ≈ 1 µm, Iac = 7 nA, T ≈ 50 mK, ΔIdc = 15 nA. (c) Monolayer graphene with a very narrow slit. Its width estimated by AFM was <10 nm. W ≈ 4 µm, Iac = 5 nA, T ≈ 1 K, ΔIdc = 1 nA. The junction in panel b was edgeless; panels a and c show edged Josephson junctions.