WS$_2$ 单层中带电激子的自平衡发光动力学
Self-balancing luminescence kinetics of charged excitons in WS$_2$ monolayer
- Ioffe Institute（约费研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究揭示WS$_2$单层中激子、双激子及带电态形成相互作用的整体，暗三重子长寿命贡献增强发光，自洽速率方程模型成功复现温度依赖动力学。
AI中文摘要：
二维钨基过渡金属二硫化物展现出丰富的发射光谱，其中包含激子、双激子、中性及带电态的不同谱线，这些谱线通常被视为独立实体。在此，我们展示了对 WS$_2$ 单层发射动力学的研究，证明这些态共同形成一个相互作用的整体，其布居与耗尽随温度相互协调。暗三重子对亮三重子做出长寿命贡献，时间尺度为 200-300 皮秒，而来自暗态的补充促进了带电双激子的强烈发光。所开发的自洽速率方程模型很好地再现了动力学的温度依赖性，为控制此类材料中的激子态开辟了道路。
英文摘要：
Two-dimensional tungsten-based transition metal dichalcogenides exhibit a rich emission spectrum with distinct lines of exciton and biexciton states, neutral and charged, which are typically considered as independent entities. Here, we present a study of the emission kinetics of a WS$_2$ monolayer, demonstrating that these states together form a single interacting ensemble, with their population and depletion mutually coordinated with temperature. Dark trions make a long-lived contribution to the bright trion on a time scale of 200-300 picoseconds, and replenishment from dark states promotes intense luminescence of charged biexcitons. The developed self-consistent rate equation model reproduces the temperature dependence of the kinetics well, opening the way to controlling exciton states in such materials.
