Giant ratchet magneto-photocurrent in graphene lateral superlattices

Abstract

We report on the observation of the magnetic quantum ratchet effect in graphene with a lateral dual-grating top gate (DGG) superlattice. We show that the THz ratchet current exhibits sign-alternating magneto-oscillations due to the Shubnikov-de Haas effect. The amplitude of these oscillations is greatly enhanced as compared to the ratchet effect at zero magnetic field. The direction of the current is determined by the lateral asymmetry which can be controlled by variation of gate potentials in DGG. We also study the dependence of the ratchet current on the orientation of the terahertz electric field (for linear polarization) and on the radiation helicity (for circular polarization). Notably, in the latter case, switching from right- to left-circularly polarized radiation results in an inversion of the photocurrent direction. We demonstrate that most of our observations can be well fitted by the drift-diffusion approximation based on the Boltzmann kinetic equation with the Landau quantization fully encoded in the oscillations of the density of states.

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• Ratchet based ion pumps for selective ion separations
• Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
• 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
• THz ratchet effect in HgTe interdigitated structures
• Terahertz spin ratchet effect in magnetic metamaterials
• Circular THz ratchets in a 2D-modulated Dirac system
• Ratchet effect in frequency-modulated waveguide-coupled emitter arrays
• Terahertz and gigahertz magneto-ratchets in graphene-based 2D metamaterials