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Terahertz Radiation Driven Chiral Edge Currents in 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 (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; M. Ostler ; T. Seyller ; S. D. Ganichev
Physical Review Letters (0031-9007). Vol. 107 (2011), 27,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: epitaxial graphene, deep impurities, semiconductors, ionization



Denna post skapades 2012-01-20. Senast ändrad 2015-10-22.
CPL Pubid: 154134

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Fysik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


New Electronics Concept: Wafer-Scale Epitaxial Graphene (CONCEPTGRAPHENE) (EC/FP7/257829)