Chirality reorganizes the sign structure of finite-q photon-drag photocurrents in 2D Dirac fermions, yielding sign reversals for J≥2 but not for J=1, with transverse symmetry and vanishing at q=0 in centrosymmetric cases.
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Finite-q photon-drag shift current in two-dimensional massive chiral Dirac fermions
Chirality reorganizes the sign structure of finite-q photon-drag photocurrents in 2D Dirac fermions, yielding sign reversals for J≥2 but not for J=1, with transverse symmetry and vanishing at q=0 in centrosymmetric cases.