Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO(2) laser
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 12, 125429- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 84, no 12, 125429- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-71075DOI: 10.1103/PhysRevB.84.125429ISI: 000294777800014OAI: oai:DiVA.org:liu-71075DiVA: diva2:444865
|DAAD||IB of BMBF at DLR||Applications Center "Miniaturised Sensorics"||Swedish Research Council||SSF||RFBR||Russian Ministry of Education and Sciences||"Dynasty" Foundation ICFPM||2011-09-302011-09-302011-10-20