Fig. 3: Vortex penetration.
From: Experimental detection of vortices in magic-angle graphene
Differential resistance R measured as a function of I and B, for a forward magnetic-field sweep in (a) and a backward sweep in (b). The bottom axes show the corresponding scaled flux ΦW/Φ0 penetrating junction and leads, where ΦW = BW2. The tuning parameters are nl = 4.2 × 1012 cm−2, Dl/ϵ0 = −0.3 V/nm and nj = 6.2 × 1012 cm−2, Dj/ϵ0 = −0.5 V/nm (‘strong-leads’ setting). Sudden shifts of the interference pattern are highlighted with black arrows. Theoretical fits of the measured Fraunhofer patterns (a) and (b) on the basis of the analysis in Ref. 32, with 7 (in (c)) and 4 (in (d)) vortices leaving/penetrating the leads.
