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We study the commensurately-tilted bilayer graphene in the tight-bindingmodel with changing the interlayer distance, which can be tuned by pressure. Wefind that at the commensurately-tilted bilayer graphene with moderate rotatingangles, when the energy gap at K point is not negligible, the other Diracpoints within the upper two bands move along the $\Gamma$-K-M line in thebilayer Brillouzone, when the interlayer distance is changed. The velocity at Kpoint becomes zero due to the merging of the four Dirac points within upper twobands. This mechanism of zero velocity at K point is expected to be the originof the magic angle with flat band at ambient pressure, at which the upper twobands are almost degenerate and the band gap at K can be neglected.

Merged Four Dirac Points at the Critical Interlayer Distance in Commensurately Twisted Bilayer Graphene: the Origin of the Zero Velocity