Phonon wind and drag of excitons in monolayer semiconductors

Abstract

We study theoretically the non-equilibrium exciton transport in monolayer transition metal dichalcogenides. We consider the situation where excitons interact with non-equilibrium phonons, e.g., under the conditions of localized excitation where a ``hot spot'' in formed. We develop the theory of the exciton drag by the phonons and analyze in detail the regimes of diffusive propagation of phonons and ballistic propagation of phonons where the phonon wind is formed. We demonstrate that a halo-like spatial distribution of excitons akin observed in [Phys. Rev. Lett. 120, 207401 (2018)] can be formed as a result of the exciton drag by non-equilibrium phonons or Seebeck effect.

13 pages, 5 figures

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• Phonon Transport in Single-Layer Transition Metal Dichalcogenides: a First-Principles Study
• Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
• Phonon Sidebands in Transition Metal Dichalcogenides
• Exciton propagation and halo formation in two-dimensional materials
• Dimensional crossover of acoustic phonon lifetime in $2H$-MoSe${}_2$

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