Terahertz Radiation Driven Chiral Edge Currents in Graphene

Funding agencies|DFG| SPP 1459 GRK 1570 |EU-ConceptGraphene||IB of BMBF at DLR||RFBR||Russian Ministry of Education and Sciences||Dynasty Foundation-ICFPM||
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 reduce the spatial symmetry and result in an asymmetric scattering of carriers driven by the radiation electric field. The developed theory based on Boltzmann's kinetic equation is in a good agreement with the experiment. We show that the edge photocurrents can be applied for determination of the conductivity type and the momentum scattering time of the charge carriers in the graphene edge vicinity.

Drexler, C.Terahertz Center, University of Regensburg, Germany (author)
Olbrich, P.Terahertz Center, University of Regensburg, Germany (author)
Fehrenbacher, M.Terahertz Center, University of Regensburg, Germany (author)
Hirmer, M.Terahertz Center, University of Regensburg, Germany (author)
Glazov, M. M.Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg (author)
Tarasenko, S. A.Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg,University of Erlangen-Nürnberg, Germany (author)
Ivchenko, E. L.Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg (author)
Birkner, B.Terahertz Center, University of Regensburg, Germany (author)
Eroms, J.Terahertz Center, University of Regensburg, Germany (author)
Weiss, D.Terahertz Center, University of Regensburg, Germany (author)
Yakimova, RositsaLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)rosia15 (author)
Lara Avila, Samuel,1983Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)larsavil (author)
Kubatkin, Sergey,1959Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kubatkin (author)
Ostler, M.University of Erlangen-Nürnberg, Germany (author)
Seyller, T. (author)
Ganichev, S. D.Terahertz Center, University of Regensburg, Germany (author)
Terahertz Center, University of Regensburg, GermanyIoffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg (creator_code:org_t)

By the author/editor: Karch, J.; Drexler, C.; Olbrich, P.; Fehrenbacher, M.; Hirmer, M.; Glazov, M. M.; show more...; Tarasenko, S. A.; Ivchenko, E. L.; Birkner, B.; Eroms, J.; Weiss, D.; Yakimova, Rosits ...; Lara Avila, Samu ...; Kubatkin, Sergey ...; Ostler, M.; Seyller, T.; Ganichev, S. D.; show less...

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