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Renormalized Dirac-point band velocity. The band velocity of the twisted bilayer at the Dirac point v⋆ is plotted vs. α2, where α = w/vkθ for 0.18° < θ < 1.2°. The velocity vanishes for θ ≈ 1.05°, 0.5°, 0.35°, 0.24°, and 0.2°. (Inset) The renormalized velocity at larger twist angles. The solid line corresponds to numerical results and dashed line corresponds to analytic results based on the eight-band model.
