Fig. 3: The Wilson loop spectrum.
From: Two-dimensional Stiefel-Whitney insulators in liganded Xenes
The number of crossing points on Θ = π is 1 for a d-CH and 3 for b s-CH, indicating a nontrivial second SW number w2 = 1 for both systems. The insets show zoomed-in plots of the spectrum around Θ = π.
