论文标题
过渡金属二核苷中自旋和动量黑暗激子的亮度
Brightening of spin- and momentum-dark excitons in transition metal dichalcogenides
论文作者
论文摘要
单层过渡金属二分法（TMDS）一直是当前研究的重点，以及其他研究的出色激子景观，包括明亮和深色的激发态状态。尽管黑暗激子在光谱中并不直接可见，但它们对激子动力学产生了很大的影响，因此，他们的理解对于潜在的基于TMD的应用至关重要。在这里，我们通过与声子和平面磁场的相互作用研究深色激子的亮亮机制。我们在WS $ _2 $，WSE $ _2 $和MOS $ _2 $中显示了动量和自旋黑暗激子的清晰签名，而Mose $ _2 $的光发光仅由明亮的激子确定。特别是，我们揭示了在Mos $ _2 $中旋转的状态亮度{and}动量向下的状态的机制。我们的结果与最近的实验非常吻合，并有助于更好地了解TMD中的激子景观。
Monolayer transition metal dichalcogenides (TMDs) have been in focus of current research, among others due to their remarkable exciton landscape consisting of bright and dark excitonic states. Although dark excitons are not directly visible in optical spectra, they have a large impact on exciton dynamics and hence their understanding is crucial for potential TMD-based applications. Here, we study brightening mechanisms of dark excitons via interaction with phonons and in-plane magnetic fields. We show clear signatures of momentum- and spin-dark excitons in WS$_2$, WSe$_2$ and MoS$_2$, while the photoluminescence of MoSe$_2$ is only determined by the bright exciton. In particular, we reveal the mechanism behind the brightening of states that are both spin- \textit{and} momentum-dark in MoS$_2$. Our results are in good agreement with recent experiments and contribute to a better microscopic understanding of the exciton landscape in TMDs.
