Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation

Shinichiro Mouri; Yuhei Miyauchi; Minglin Toh; Weijie Zhao; Goki Eda; Kazunari Matsuda

doi:10.1103/PhysRevB.90.155449

Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation

Mesoscale and Nanoscale Physics 2014-11-05 v1

Authors: Shinichiro Mouri , Yuhei Miyauchi , Minglin Toh , Weijie Zhao , Goki Eda , Kazunari Matsuda

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Abstract

We studied multi-exciton dynamics in monolayer WSe2 using nonlinear photoluminescence (PL) spectroscopy and Monte Carlo simulations. We observed strong nonlinear saturation behavior of exciton PL with increasing excitation power density, and long-distance exciton diffusion reaching several micrometers. We demonstrated that the diffusion-assisted exciton-exciton annihilation model accounts for the observed nonlinear PL behavior. The long-distance exciton diffusion and subsequent efficient exciton-exciton annihilation process determined the unusual multi-exciton dynamics in atomically thin layered transition metal dichalcogenides.

Keywords

nonlinear photoluminescence WSe2 monolayer exciton-exciton annihilation exciton diffusion multi-exciton dynamics Monte Carlo simulations transition metal dichalcogenides

Cite

@article{arxiv.1405.5781,
  title  = {Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation},
  author = {Shinichiro Mouri and Yuhei Miyauchi and Minglin Toh and Weijie Zhao and Goki Eda and Kazunari Matsuda},
  journal= {arXiv preprint arXiv:1405.5781},
  year   = {2014}
}

Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation

Abstract

Keywords

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