Terahertz ratchet effects in graphene with a lateral superlattice

Abstract

Experimental and theoretical studies on ratchet effects in graphene with a lateral superlattice excited by alternating electric fields of terahertz frequency range are presented. A lateral superlatice deposited on top of monolayer graphene is formed either by periodically repeated metal stripes having different widths and spacings or by inter-digitated comb-like dual-grating-gate (DGG) structures. We show that the ratchet photocurrent excited by terahertz radiation and sensitive to the radiation polarization state can be efficiently controlled by the back gate driving the system through the Dirac point as well as by the lateral asymmetry varied by applying unequal voltages to the DGG subgratings. The ratchet photocurrent includes the Seebeck thermoratchet effect as well as the effects of "linear" and "circular" ratchets, sensitive to the corresponding polarization of the driving electromagnetic force. The experimental data are analyzed for the electronic and plasmonic ratchets taking into account the calculated potential profile and the near field acting on carriers in graphene. We show that the photocurrent generation is based on a combined action of a spatially periodic in-plane potential and the spatially modulated light due to the near field effects of the light diffraction.

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• Fast and Sensitive Terahertz Detection in a Current-Driven Epitaxial-Graphene Asymmetric Dual-Grating-Gate FET Structure
• Terahertz Photogalvanic Spectroscopy of Three Dimensional Topological Insulators
• Tight-binding terahertz plasmons in chemical vapor deposited graphene
• Ratchet effect in spatially modulated bilayer graphene: Signature of hydrodynamic transport
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• Observation of terahertz-induced magnetooscillations in graphene
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• Highly superlinear photogalvanic effects in (Bi${}_{0.3}$Sb${}_{0.7}$)${}_2$(Te${}_{0.1}$Se${}_{0.9}$)${}_3$: Probing 3D topological insulator surface states at room temperature
• Giant terahertz photoconductance of tunneling point contacts
• Beatings of ratchet current magneto-oscillations in GaN-based grating gate structures: manifestation of spin-orbit band splitting
• Cyclotron resonance of the magnetic ratchet effect and second harmonic generation in bilayer graphene
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Circular and linear magnetic quantum ratchet effects in dual-grating-gate CdTe-based nanostructures
• Edge photocurrent in bilayer graphene due to inter-Landau-level transitions
• Ratchet based ion pumps for selective ion separations
• A place for two-dimensional plasmonics in electromagnetic wave detection
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• Steering multiattractors to overcome parameter inaccuracy and noise effects
• Plasma Instability and Amplified Mode Switching Effect in THz Field Effect Transistors with Grating Gate
• Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
• Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
• Optimizing thermally affected ratchet currents using periodic perturbations
• Temperature Dependent Zero-Field Splittings in Graphene
• Infrared photoresistance as a sensitive probe of electronic transport in twisted bilayer graphene
• Nonlinear intensity dependence of ratchet currents induced by terahertz laser radiation in bilayer graphene with asymmetric periodic grating gates
• Observation of anomalously strong penetration of terahertz electric field through terahertz-opaque gold films into a GaAs/AlGaAs quantum well
• Terahertz ratchet in graphene 2D metamaterial formed by a patterned gate with an antidot arrayd
• Current induced by a tilted magnetic field in phosphorene under terahertz laser radiation
• THz ratchet effect in HgTe interdigitated structures
• Terahertz spin ratchet effect in magnetic metamaterials
• Electrostatics of optical rectification in metallic particles
• Magnetic ratchet effect in phosphorene
• High-frequency rectification in graphene lateral p-n junctions
• Current-induced enhancement of photo-response in graphene THz radiation detectors
• Plasmons in two-dimensional electron systems with infinite and semi-infinite metal gratings
• Highly Superlinear Giant Terahertz Photoconductance in GaAs Quantum Point Contacts in the Deep Tunneling Regime
• Photon drag at the junction between metal and 2d semiconductor
• Circular THz ratchets in a 2D-modulated Dirac system
• Optically-induced Umklapp shift currents in striped cuprates
• Realization of ultrabroadband THz/IR photoresponse in a bias-tunable ratchet photodetector
• Terahertz and gigahertz magneto-ratchets in graphene-based 2D metamaterials
• Plasmonic drag photocurrent in graphene at extreme nonlocality
• Exact theory of edge diffraction and launching of transverse electric plasmons at two-dimensional junctions
• Unconventional quantization of 2D plasmons in cavities formed by gate slots
• Strong photoresponse of edge two-dimensional electrons in a magnetic field
• Skew scattering and ratchet effect in photonic graphene
• Carbon nanotubes for polarization sensitive terahertz plasmonic interferometry