Extended Data Fig. 2: Representative FFT images obtained from the atomic-scale STS maps of edge states.

a-e, Upper panels, modulus of the complex FFT amplitude |n(k)|; Lower panels, complex phase masked by the modulus, |n(k)|arg(n(k)) (see Methods and Supplementary Information Section 7 for details). Images are obtained from representative points on the edge channels in Fig. 2h (a), the two edge channels in Fig. 2i (left, b; right, c), and the two channels in Fig. S5a (left, d; right, e). V_B = 0 except for a where a small negative offset V_B = −1 mV is applied to maintain sufficient dI/dV contrast for accurate FFT analysis. The six prominent peaks in the top panel of a, and the corresponding peaks at the same (k_x, k_y) in b-e are Bragg peaks of the graphene lattice. In b-e a new set of peaks at the Kekulé vectors are more prominent than the Bragg peaks, indicating strong intervalley coherence²⁷.