Fig. 3: Simulation of the local electron density and thermopower of TBG.
From: Thermal biasing for lattice symmetry breaking and topological edge state imaging
A Schematic image of bilayer graphene boundary with topologically protected helical edge states. The different valley Chern numbers in the AB and BA stacking regions lead to the topological edge states for K (red arrows) and K’ (blue arrows) valleys, as shown in the real space. B Band structure of bilayer graphene with a vertical electric field. The topological edge states at K and K’ valley with a bandgap Δ are shown in the reciprocal space. The Fermi level is marked with a black dashed line. C Calculated local charge density and thermopower. The position at 0 nm is set to be the saddle point. The AB and BA stacked regions are the left and right sides of the domain. D Matching the measured local thermopower with different Vgate values (thicker curves) along the colored line in ‘Fig. 2’, with the theoretical results (thinner curves). The AB and BA regions’ asymmetry, originating from the h-BN substrate, is not considered in the calculation.
