Ratchet effect in spatially modulated bilayer graphene: Signature of hydrodynamic transport

Abstract

We report on the observation of the ratchet effect -- generation of direct electric current in response to external terahertz (THz) radiation -- in bilayer graphene, where inversion symmetry is broken by an asymmetric dual-grating gate potential. As a central result, we demonstrate that at high temperature, $T=150\text{K}$, the ratchet current decreases at high frequencies as $\propto 1/{\omega }^2$, while at low temperature, $T=4.2\text{K}$, the frequency dependence becomes much stronger $\propto 1/{\omega }^6$. The developed theory shows that the frequency dependence of the ratchet current is very sensitive to the ratio of the electron-impurity and electron-electron scattering rates. The theory predicts that the dependence $1/{\omega }^6$ is realized in the hydrodynamic regime, when electron-electron scattering dominates, while $1/{\omega }^2$ is specific for the drift-diffusion approximation. Therefore, our experimental observation of a very strong frequency dependence reveals the emergence of the hydrodynamic regime.

arXiv comment21 pages, 12 figures

References in corpus (55)

• Brownian motors: noisy transport far from equilibrium
• Gate-induced insulating state in bilayer graphene devices
• Artificial Brownian motors: Controlling transport on the nanoscale
• Graphene field effect transistors as room-temperature Terahertz detectors
• Negative local resistance caused by viscous electron backflow in graphene
• Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
• Evidence for hydrodynamic electron flow in PdCoO${}_2$
• Superballistic flow of viscous electron fluid through graphene constrictions
• Hydrodynamics of electrons in graphene
• Imaging viscous flow of the Dirac fluid in graphene
• Hydrodynamic electron flow in high-mobility wires
• Measuring Hall Viscosity of Graphene's Electron Fluid
• Visualizing Poiseuille flow of hydrodynamic electrons
• Electrical and Thermal Transport at the Planckian Bound of Dissipation in the Hydrodynamic Electron Fluid of WP2
• Quantum transport in Rashba spin-orbit materials: A review
• Fluidity Onset in Graphene
• Enhanced Thermoelectric Power in Graphene: Violation of the Mott Relation By Inelastic Scattering
• Plasmonic terahertz detection by a double-grating-gate field-effect transistor structure with an asymmetric unit cell
• Imaging phonon-mediated hydrodynamic flow in WTe2
• Tunable transport with broken space-time symmetries
• Transport and elastic scattering times as probes of the nature of impurity scattering in single and bilayer graphene
• Electronic properties of a biased graphene bilayer
• Viscous electron fluids
• Hydrodynamic approach to electronic transport in graphene
• Departure from the Wiedemann-Franz Law in WP${}_2$ Driven by Mismatch in $T$-square Resistivity Prefactors
• Scanning Gate Microscopy in a Viscous Electron Fluid
• Terahertz ratchet effects in graphene with a lateral superlattice
• Magneto-Gyrotropic Photogalvanic Effects in Semiconductor Quantum Wells
• Electronic hydrodynamics in graphene
• Classical ratchet effects in heterostructures with a lateral periodic potential
• Control of electron-electron interaction in graphene by proximity screening
• Photogalvanic probing of helical edge channels in 2D HgTe topological insulators
• Microscopic theory for electron hydrodynamics in monolayer and bilayer graphene
• Simultaneous imaging of voltage and current density of flowing electrons in two dimensions
• Hydrodynamic and ballistic transport over large length scales in GaAs/AlGaAs
• Cyclotron resonance photoconductivity of a two-dimensional electron gas in HgTe quantum wells
• Ratchet effects induced by terahertz radiation in heterostructures with a lateral periodic potential
• Viscosity of two-dimensional electrons
• Stokes flow around an obstacle in viscous two-dimensional electron liquid
• Ratchet effects in two-dimensional systems with a lateral periodic potential
• Thermal resistivity and hydrodynamics of the degenerate electron fluid in antimony
• Electronic Spin Transport in Dual-Gated Bilayer Graphene
• Electron Transport Properties of Bilayer Graphene
• Commensurability Oscillations in One-Dimensional Graphene Superlattices
• Collision dominated, ballistic, and viscous regimes of terahertz plasmonic detection by graphene
• Manifestations of classical size effect and electronic viscosity in the magnetoresistance of narrow two-dimensional conductors: Theory and experiment
• Terahertz electric field driven electric currents and ratchet effects in graphene
• Viscous magnetotransport and Gurzhi effect in bilayer electron system
• Helicity sensitive terahertz radiation detection by dual-grating-gate high electron mobility transistors
• Magnetic quantum ratchet effect in (Cd,Mn)Te- and CdTe-based quantum well structures with a lateral asymmetric superlattice
• Beatings of ratchet current magneto-oscillations in GaN-based grating gate structures: manifestation of spin-orbit band splitting
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Circular and linear magnetic quantum ratchet effects in dual-grating-gate CdTe-based nanostructures
• Ratchet transport of a two-dimensional electron gas at cyclotron resonance
• Rectification by hydrodynamic flow in an encapsulated graphene Tesla valve

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• Lateral plasmonic crystals: Tunability, dark modes, and weak-to-strong coupling transition
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• Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
• Temperature Dependent Zero-Field Splittings in Graphene
• Nonlinear density waves on graphene electron fluids
• Nonlinear intensity dependence of ratchet currents induced by terahertz laser radiation in bilayer graphene with asymmetric periodic grating gates
• Spin and Valley Hall effects induced by asymmetric interparticle scattering
• Terahertz ratchet in graphene 2D metamaterial formed by a patterned gate with an antidot arrayd
• Terahertz spin ratchet effect in magnetic metamaterials
• Observability of cyclotron resonance in the hydrodynamic regime of bilayer graphene
• Circular THz ratchets in a 2D-modulated Dirac system
• Photon drag at the junction between metal and 2d semiconductor
• Terahertz and gigahertz magneto-ratchets in graphene-based 2D metamaterials
• Spin-dependent photovoltage in graphene/MoS2-based field-effect transistors
• Exact theory of edge diffraction and launching of transverse electric plasmons at two-dimensional junctions
• Photogalvanic effect in hydrodynamic flows of nonreciprocal electron liquids
• Strong photoresponse of edge two-dimensional electrons in a magnetic field
• Skew scattering and ratchet effect in photonic graphene