Terahertz Radiation Driven Chiral Edge Currents in Graphene

URN to cite this document:: urn:nbn:de:bvb:355-epub-235073
DOI to cite this document:: 10.5283/epub.23507

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

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Date of publication of this fulltext: 28 Feb 2012 08:34

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Abstract

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 ...