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Photodetection mechanisms. (a) Photovoltaic effect. (b) Photogating effect. (c) Graphene Edges Effect. (d) Photothermoelectric effect. (e) Photobolometric Effect. (f) Sketch of a pair of Weyl cones. (g) Schematics of the chiral selection rule and circular photogalvanic effect response from a pair of Weyl cones in momentum space. The grey dashed line denotes the Fermi level μ without applying a built-in electric field. Black crosses mark the forbidden transitions.
