4.6 Article

Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2 laser

Journal

PHYSICAL REVIEW B
Volume 84, Issue 12, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.125429

Keywords

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Funding

  1. DFG [SPP 1459, GRK 1570]
  2. DAAD
  3. IB of BMBF at DLR
  4. Applications Center Miniaturised Sensorics
  5. Swedish Research Council
  6. SSF
  7. RFBR
  8. Russian Ministry of Education and Sciences
  9. Dynasty Foundation ICFPM

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We report the study of the helicity-driven photocurrents in graphene excited by midinfrared light of a CO2 laser. Illuminating an unbiased monolayer sheet of graphene with circularly polarized radiation generates-under oblique incidence-an electric current perpendicular to the plane of incidence, whose sign is reversed by switching the radiation helicity. We show that the current is caused by the interplay of the circular ac Hall effect and the circular photogalvanic effect. By studying the frequency dependence of the current in graphene layers grown on the SiC substrate, we observe that the current exhibits a resonance at frequencies matching the longitudinal optical phonon in SiC.

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