Radiative lifetime and dynamics of trions in few-layered ReS2
Radiative lifetime and dynamics of trions in few-layered ReS2
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DOI：
10.1063/5.0059198
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发表时间：
2021-09
影响因子：
4
通讯作者：
Xiaofan Wang;K. Shinokita;K. Matsuda
中科院分区：
文献类型：
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作者：
Xiaofan Wang;K. Shinokita;K. Matsuda
具有各向异性电学和光学性质的少层ReS2在二维（2D）材料研究领域引起了广泛关注。最近，在几层ReS2中实验观察到由两个电子和一个具有大结合能的空穴的束缚态组成的稳定带电激子（trion）。然而，稳定三重体的动力学仍不清楚。我们通过温度依赖性光致发光光谱和唯象速率方程分析研究了激发态动力学，包括三层 (3L)-ReS2 中负三重粒子的辐射寿命。 Trion的衍生辐射寿命随着温度的升高而线性增加，在150 K的高温下达到几纳秒；这一观察结果表明，实验观察到的 3L-ReS2 中的负三重子处于光学允许状态。我们的结果为二维材料中激子态的物理提供了重要的见解。
Few-layered ReS2 with anisotropic electrical and optical properties has attracted much attention in the research field of two-dimensional (2D) materials. Recently, a stable charged exciton (trion) composed of bound states of two electrons and a hole with large binding energy has been experimentally observed in a few-layered ReS2. However, the dynamics of stable trions remain unclear. We studied the excited-state dynamics, including the radiative lifetime of the negative trion in three layer (3L)-ReS2 via temperature-dependent photoluminescence spectroscopy and phenomenological rate-equation analysis. The derived radiative lifetime of the trion increases linearly with increasing temperature, reaching a few nanoseconds at a high temperature of 150 K; this observation implies that the experimentally observed negative trion in 3L-ReS2 lies in the optically allowed state. Our results provide significant insights into the physics of excitonic states in 2D materials.