Quantum Nonlinear Acoustic Hall Effect and Inverse Acoustic Faraday Effect in Dirac Insulators
arXiv:2407.01457 · doi:10.1103/PhysRevLett.134.026304
Abstract
We propose to realize the quantum nonlinear Hall effect and the inverse Faraday effect through the acoustic wave in a time-reversal invariant but inversion broken Dirac insulator. We focus on the acoustic frequency much lower than the Dirac gap such that the interband transition is suppressed and these effects arise solely from the intrinsic valley-contrasting band topology. The corresponding acoustoelectric conductivity and magnetoacoustic susceptibility are both proportional to the quantized valley Chern number and independent of the quasiparticle lifetime. The linear and nonlinear components of the longitudinal and transverse topological currents can be tuned by adjusting the polarization and propagation directions of the surface acoustic wave. The static magnetization generated by a circularly polarized acoustic wave scales linearly with the acoustic frequency as well as the strain-induced charge density. Our results unveil a quantized nonlinear topological acoustoelectric response of gapped Dirac materials, like hBN and transition-metal dichalcogenide, paving the way toward room-temperature acoustoelectric devices due to their large band gaps.
6 pages, 2 figures in main text, and 7 pages, 5 figures, 2 tables in supplement
References in corpus (20)
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Valley filter and valley valve in graphene
- Dirac materials
- Detecting Topological Currents in Graphene Superlattices
- Periodically rippled graphene: growth and spatially resolved electronic structure
- Edge states in Graphene: from gapped flat band to gapless chiral modes
- Nonlinear Hall Effects
- Origin of band gaps in graphene on hexagonal boron nitride
- Symmetry-based approach to electron-phonon interactions in graphene
- Gauge field induced by ripples in graphene
- Graphene Nanobubbles as Valley Filters and Beamsplitters
- Orbital magnetic moments of phonons
- Electronic structure of graphene hexagonal flake subjected to triaxial stress
- Valley Acoustoelectric Effect
- Acoustically Induced Giant Synthetic Hall Voltages in Graphene
- General nonlinear Hall current in magnetic insulators beyond the quantum anomalous Hall effect
- Axial Magnetoelectric Effect in Dirac semimetals
- Acoustoelectric effect in two-dimensional Dirac materials exposed to Rayleigh surface acoustic waves
- Phonon Inverse Faraday effect from electron-phonon coupling
- Acousto-magnonic spin Hall effect in honeycomb antiferromagnets