  We investigate non-adiabatic electron pumping in graphene generated by laser
irradiation with linear polarization parallel or perpendicular to the transport
direction. Transport is dominated by the spatially asymmetric excitation of
electrons from evanescent into propagating modes. For a laser with parallel
polarization, the pumping response exhibits a subharmonic resonant enhancement
which directly probes the Fermi energy; no such enhancement occurs for
perpendicular polarization. The resonance mechanism relies on the chirality of
charge carriers in graphene.
