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

C. Y. Jiang ; V. A. Shalygin ; V. Y. Panevin ; S. N. Danilov ; M. M. Glazov ; R. Yakimova ; Samuel Lara-Avila (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; S. D. Ganichev
Physical Review B (1098-0121). Vol. 84 (2011), 12,
[Artikel, refereegranskad vetenskaplig]

We report the study of the helicity-driven photocurrents in graphene excited by midinfrared light of a CO(2) 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.

Nyckelord: electronic-properties, quantum-wells, free carriers, berrys phase, photon drag, semiconductors, graphite, pressure, light, field

Denna post skapades 2011-10-13. Senast ändrad 2015-10-22.
CPL Pubid: 147222


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



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