Fig. 2: Fraunhofer patterns emerging from edge state supercurrent of device A and B.
a Fraunhofer pattern at the SC/CI’/SC position of sample A up to higher out-of-plane magnetic field B. A revival of the oscillations is observed after 30 mT. b Calculated Ic(B) behavior based on the current density distribution shown in c. A combination of edge and bulk supercurrent with non-symmetric edges having different phases φedge,n, where n = 1, 2 for the top and bottom edge respectively, such that φedge1(I > 0) = −π/4, φedge1(I < 0) = π/4 and φedge2 = −φedge1 give rise to a qualitatively similar pattern as measured in the experiment. c Current density distribution combining edge and bulk supercurrent. The inset shows a cartoon displaying the superconducting TBG forming the JJ (SCTBG) in light green and the weak link with bulk and edge contribution in purple and violet, as well as the different phases carried by the edges to calculate the pattern in b. d Fraunhofer pattern at the SC/CI’/SC position of sample B. The pattern resembles a pattern coming from purely edge supercurrent. e Calculated Ic(B) behavior based on the current density distribution shown in f, in which all the supercurrent is carried by the edges. f Current density distribution with only edge conduction. The inset shows a cartoon in which the current is only carried by edge states, without acquiring any extra phase.
