Terahertz electric field driven electric currents and ratchet effects in graphene

Abstract

Terahertz field induced photocurrents in graphene were studied experimentally and by microscopic modeling. Currents were generated by cw and pulsed laser radiation in large area as well as small-size exfoliated graphene samples. We review general symmetry considerations leading to photocurrents depending on linear and circular polarized radiation and then present a number of situations where photocurrents were detected. Starting with the photon drag effect under oblique incidence, we proceed to the photogalvanic effect enhancement in the reststrahlen band of SiC and edge-generated currents in graphene. Ratchet effects were considered for in-plane magnetic fields and a structure inversion asymmetry as well as ratchets by non-symmetric patterned top gates. Lastly, we demonstrate that graphene can be used as a fast, broadband detector of terahertz radiation.

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Cited by in corpus (14)

• Terahertz photogalvanics in twisted bilayer graphene close to the second magic angle
• Terahertz Photogalvanic Spectroscopy of Three Dimensional Topological Insulators
• Ratchet effect in spatially modulated bilayer graphene: Signature of hydrodynamic transport
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Beatings of ratchet current magneto-oscillations in GaN-based grating gate structures: manifestation of spin-orbit band splitting
• Photocurrents in bulk tellurium
• Edge photocurrent in bilayer graphene due to inter-Landau-level transitions
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• Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
• Temperature Dependent Zero-Field Splittings in Graphene
• Nonlinear intensity dependence of ratchet currents induced by terahertz laser radiation in bilayer graphene with asymmetric periodic grating gates
• Terahertz ratchet in graphene 2D metamaterial formed by a patterned gate with an antidot arrayd
• Circular THz ratchets in a 2D-modulated Dirac system
• Terahertz and gigahertz magneto-ratchets in graphene-based 2D metamaterials