Nonlinear intensity dependence of edge photocurrents in graphene induced by terahertz radiation

Candussio, S. ; Golub, L. E.

; Bernreuter, S. ; Jötten, T. ; Rockinger, T.

; Watanabe, K.

; Taniguchi, T. ; Eroms, J. ; Weiss, D. ; Ganichev, S. D.

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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 ...