Terahertz Radiation Driven Chiral Edge Currents in Graphene
Journal article, 2011

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.



deep impurities

epitaxial graphene


J. Karch

C. Drexler

P. Olbrich

M. Fehrenbacher

M. Hirmer

M. M. Glazov

S. A. Tarasenko

E. L. Ivchenko

B. Birkner

J. Eroms

D. Weiss

R. Yakimova

Samuel Lara Avila

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Sergey Kubatkin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

M. Ostler

T. Seyller

S. D. Ganichev

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 107 27

New Electronics Concept: Wafer-Scale Epitaxial Graphene (ConceptGraphene)

European Commission (EC) (EC/FP7/257829), 2010-10-01 -- 2013-09-30.

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