Nonlinear photoluminescence in atomically thin layered ${\mathrm{WSe}}_{2}$ arising from diffusion-assisted exciton-exciton annihilation

Nonlinear photoluminescence in atomically thin layered ${WSe}_{2}$ arising from diffusion-assisted exciton-exciton annihilation

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

Phys. Rev. B 90, 155449 – Published 28 October 2014

Abstract

We studied multiexciton dynamics in monolayer ${WSe}_{2}$ 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 (EEA) model accounts for the observed nonlinear PL behavior. The long-distance exciton diffusion and subsequent efficient EEA process determined the unusual multiexciton dynamics in atomically thin layered transition metal dichalcogenides.

Received 13 June 2014
Revised 22 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.155449

Authors & Affiliations

Shinichiro Mouri^1,*, Yuhei Miyauchi^1,2,3, Minglin Toh⁴, Weijie Zhao^5,7, Goki Eda^5,6,7, and Kazunari Matsuda^1,†

¹Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
²Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
³Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
⁴School of Materials Science and Engineering, Nanyang Technological University, N4.1 Nanyang Avenue, Singapore 639798, Singapore
⁵Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
⁶Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
⁷Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore

^*iguchan@iae.kyoto-u.ac.jp
^†matsuda@iae.kyoto-u.ac.jp

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Vol. 90, Iss. 15 — 15 October 2014

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Physical Review B

covering condensed matter and materials physics

Nonlinear photoluminescence in atomically thin layered ${WSe}_{2}$ arising from diffusion-assisted exciton-exciton annihilation

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

Phys. Rev. B 90, 155449 – Published 28 October 2014

Abstract

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Physical Review B

covering condensed matter and materials physics

Nonlinear photoluminescence in atomically thin layered WSe2 arising from diffusion-assisted exciton-exciton annihilation

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

Phys. Rev. B 90, 155449 – Published 28 October 2014

Abstract

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Nonlinear photoluminescence in atomically thin layered ${WSe}_{2}$ arising from diffusion-assisted exciton-exciton annihilation