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Terahertz Radiation Driven Chiral Edge Currents in Graphene

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Karch, Johannes ; Drexler, Christoph ; Olbrich, Peter ; Fehrenbacher, M. ; Hirmer, M. ; Glazov, M. M. ; Tarasenko, Sergey ; Ivchenko, Eougenious ; Birkner, Bastian ; Eroms, Jonathan ; Weiss, Dieter ; Yakimova, R. ; Lara-Avila, S. ; Kubatkin, S. ; Ostler, M. ; Seyller, T. ; Ganichev, Sergey
Date of publication of this fulltext: 28 Feb 2012 08:34


We observe photocurrents induced in single-layer graphene samples by illumination of the graphene edges with circularly polarized terahertz radiation at normal incidence. The photocurrent flows along the sample edges and forms a vortex. Its winding direction reverses by switching the light helicity from left to right handed. We demonstrate that the photocurrent stems from the sample edges, which ...


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