Helicity-dependent photocurrents in graphene layers excited by mid-infrared radiation of a CO${}_2$-laser

Abstract

We report the study of the helicity driven photocurrents in graphene excited by mid-infrared 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. 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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• Helicity sensitive plasmonic teraherts interferometer
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• Polarization-dependent photocurrents in polar stacks of van der Waals solids
• Giant terahertz photoconductance of tunneling point contacts
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• Cyclotron resonance of the magnetic ratchet effect and second harmonic generation in bilayer graphene
• Circular and linear magnetic quantum ratchet effects in dual-grating-gate CdTe-based nanostructures
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• Magneto-resistance oscillations induced by high-intensity terahertz radiation
• Circular and Linear Photogalvanic Effects in Type-II GaSb/InAs Quantum Well Structures in the Inverted Regime
• Determination of hole g-factor in InAs/InGaAs/InAlAs quantum wells by magneto-photoluminescence studies
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• Large photon drag effect of intrinsic graphene induced by plasmonic evanescent field