Valley Acoustoelectric Effect

Abstract

We report on novel valley acoustoelectric effect, which can arise in a 2D material, like a transition metal dichalcogenide monolayer, residing on a piezoelectric substrate. The essence of this effect lies in the emergence of a drag electric current (and a spin current) due to a propagating surface acoustic wave. This current consists of three contributions, one independent of the valley index and proportional to the acoustic wave vector, the other arising due to the trigonal warping of the electron dispersion, and the third one is due to the Berry phase, which Bloch electrons acquire traveling along the crystal. As a result, there appear components of the current orthogonal to the acoustic wave vector. Further, we build an angular pattern, encompassing nontrivial topological properties of the acoustoelectric current, and suggest a way to run and measure the conventional diffusive, warping, and acoustoelectric valley Hall currents independently. We develop a theory, which opens a way to manipulate valley transport by acoustic methods, expanding the applicability of valleytronic effects on acoustoelectronic devices.

Main text: 5 pages, 3 figures + Supplemental Material

References in corpus (8)

• The Valley Hall Effect in MoS2 Transistors
• Berry phase effect in anomalous thermoelectric transport
• Nonlinear valley and spin currents from Fermi pocket anisotropy in 2D crystals
• All-optical band engineering of gapped Dirac materials
• Theory of resonant photon drag in monolayer graphene
• Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping
• Valley polarization induced second harmonic generation in graphene
• Optical generation and detection of pure valley current in monolayer transition metal dichalcogenides

Cited by in corpus (18)

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• Acoustomagnetoelectric effect in two-dimensional materials: Geometric resonances and Weiss oscillations
• Acousto-magnonic spin Hall effect in honeycomb antiferromagnets
• Photoinduced Anomalous Supercurrent Hall Effect
• Impact of novel electron-phonon coupling mechanisms on valley physics in two-dimensional materials
• Electron qubits surfing on acoustic waves: review of recent progress
• Electron diffusion induced valley Hall effect and nonlinear galvanodiffusive transport in hexagonal 2D Dirac monolayer materials
• Valley transport driven by dynamic lattice distortion
• Valley spin-acoustic resonance in MoS${}_2$ monolayers
• Unexpected large electrostatic gating by pyroelectric charge accumulation
• Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors
• Quantum Nonlinear Acoustic Hall Effect and Inverse Acoustic Faraday Effect in Dirac Insulators
• Role of Coulomb interaction in the valley photogalvanic effect
• Renormalization of the valley Hall conductivity due to interparticle interaction
• Coulomb drag by motion of a monolayer polar crystal through graphene nanoconstriction
• Quantized Acoustoelectric Floquet Effect in Quantum Nanowires
• Surface acoustic wave driven acoustic spin splitter in d-wave altermagnetic thin films
• Impurity-band optical transitions in two-dimensional Dirac materials under strain-induced synthetic magnetic field