Near the magic angle, twisted bilayer graphene's G Raman mode splits and its 2D mode broadens, with a tenfold larger fitted anharmonic coefficient than Bernal bilayer graphene.
However, they did not observe any splitting of the G mode
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Anomalies in G and 2D Raman Modes of Twisted Bilayer Graphene Near the Magic Angle
Near the magic angle, twisted bilayer graphene's G Raman mode splits and its 2D mode broadens, with a tenfold larger fitted anharmonic coefficient than Bernal bilayer graphene.