激子
光致发光
消灭
材料科学
光谱学
饱和(图论)
凝聚态物理
扩散
物理
量子力学
光电子学
数学
组合数学
作者
Shinichiro Mouri,Yuhei Miyauchi,Minglin Toh,Weijie Zhao,Goki Eda,Kazunari Matsuda
出处
期刊:Physical Review B
[American Physical Society]
日期:2014-10-28
卷期号:90 (15)
被引量:195
标识
DOI:10.1103/physrevb.90.155449
摘要
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.
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