Zusammenfassung
We report on the observation of terahertz-radiation-induced edge photogalvanic currents in graphene, which are nonlinear in intensity. The increase of the radiation intensities up to MW/cm(2) results in a complex nonlinear intensity dependence of the photocurrent. The nonlinearity is controlled by the back gate voltage, temperature, and radiation frequency. A microscopic theory of the nonlinear ...
