论文标题
基于MO的过渡金属二核苷中的声子介导的激子捕获
Phonon-mediated exciton capture in Mo-based transition metal dichalcogenides
论文作者
论文摘要
局部激子在过渡金属二分法的单层的光学响应中起着至关重要的作用，并且可以用作量子信息技术的单个光子源。尽管对这种局部激子的光学特性进行了深入的研究，但在很大程度上尚未探索到局部电位的超快捕获过程中的超快捕获过程。我们通过声音和光学声子对激子捕获进行量子动力学计算，以表明有效捕获发生在超快的时间尺度上。低温极限中的极性形成会导致更高的能量激子，然后可以有效地捕获。我们证明声音和光学声子的相互作用导致能量选择规则有效地扩大。我们的研究提供了对载体从二维材料捕获到零维电位的深入了解。
Localized excitons play a vital role in the optical response of monolayers of transition metal dichalcogenides and can be exploited as single photon sources for quantum information technology. While the optical properties of such localized excitons are vastly studied, the ultrafast capture process of delocalized excitons into localized potentials is largely unexplored. We perform quantum kinetic calculations of exciton capture via acoustic and optical phonons showing that efficient capture takes place on an ultrafast time scale. The polaron formation in the low-temperature limit leads to higher-energy excitons which can then be efficiently trapped. We demonstrate that the interplay of acoustic and optical phonons leads to an efficient broadening of energy-selection rules. Our studies provide a deep understanding of the carrier trapping from two-dimensional materials into zero-dimensional potentials.
