Valley Hall Transport of Photon-Dressed Quasiparticles in 2D Dirac Semiconductors

Abstract

We present a theory of the photovoltaic valley-dependent Hall effect in a two-dimensional Dirac semiconductor subject to an intense near-resonant electromagnetic field. Our theory captures and elucidates the influence of both the field-induced resonant interband transitions and the nonequilibrium carrier kinetics on the resulting valley Hall transport in terms of photon-dressed quasiparticles. The non-perturbative renormalization effect of the pump field manifests itself in the dynamics of the photon-dressed quasiparticles, with a quasienergy spectrum characterized by {dynamical gaps ${\delta }_{\eta }$ ($\eta$ is the valley index)} that strongly depend on field amplitude and polarization. Nonequilibrium carrier distribution functions are determined by the pump field frequency $\omega$ as well as the ratio of intraband relaxation time $\tau$ and interband recombination time ${\tau }_{\mathrm{rec}}$. We obtain analytic results in three regimes, when (I) all relaxation processes are negligible, (II) $\tau \ll {\tau }_{\mathrm{rec}}$, and (III) $\tau \gg {\tau }_{\mathrm{rec}}$, and display corresponding asymptotic dependences on ${\delta }_{\eta }$ and $\omega$. We then apply our theory to two-dimensional transition-metal dichalcogenides, and find a strong enhancement of valley-dependent Hall conductivity as the pump field frequency approaches the transition energies between the pair of spin-resolved conduction and valence bands at the two valleys.

6 pages, 4 figures

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Cited by in corpus (16)

• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Valley Acoustoelectric Effect
• Photo-Induced Anomalous Hall Effect in Two-Dimensional Transition-Metal Dichalcogenides
• Acoustoelectric effect in two-dimensional Dirac materials exposed to Rayleigh surface acoustic waves
• Nonlinear circular valley photogalvanic effect
• Photogalvanic Effect in 2D Dichalcogenides Under Double Illumination
• Nonequilibrium Theory of Photoinduced Valley Hall Effect
• Photogalvanic currents in dynamically gapped Dirac materials
• Photoinduced Anomalous Supercurrent Hall Effect
• Electron diffusion induced valley Hall effect and nonlinear galvanodiffusive transport in hexagonal 2D Dirac monolayer materials
• Optical valleytronics of impurity states in two-dimensional Dirac materials
• Role of Coulomb interaction in the valley photogalvanic effect
• Renormalization of the valley Hall conductivity due to interparticle interaction
• Electric and spin-valley currents induced by structured light in 2D Dirac materials
• Impurity-band optical transitions in two-dimensional Dirac materials under strain-induced synthetic magnetic field
• Spectral maximum in the terahertz photoconductance of a quantum point contact