论文标题
使用光学涡流梁研究山谷松弛的稳态方法
A steady state approach for studying valley relaxation using optical vortex beam
论文作者
论文摘要
单层过渡金属二分法中的自旋谷耦合产生了山谷极化和相干效应，受到了由激子 - phonon，Ickiton-Phonon引起的间隔散射的限制，激子IMBRINE和电子孔交换相互作用（EHEI）。我们通过使用高阶光学涡流束的光子分布来控制质量动量（COM）的激动子中心（COM）来探索一种调整EHEI的方法。因此，我们已经观察到激子依赖性山谷去极化和反矫正性，这使我们能够测量与稳态测量中与山谷动力学相关的时间表。我们探测山谷动力学的稳态技术可以打开一个新的范式，以探索二维系统中激子的物理。
Spin-valley coupling in monolayer transition metal dichalcogenides gives rise to valley polarization and coherence effect, limited by intervalley scattering caused by exciton-phonon, exciton-impurity, and electron-hole exchange interaction (EHEI). We explore an approach to tune the EHEI by controlling excitons center of mass momentum (COM) utilizing the photon distribution of higher-order optical vortex beam. By virtue of this, we have observed excitons COM-dependent valley depolarization and decoherence which gives us the ability to measure the timescale associated with valley dynamics in the steady-state measurement. Our steady-state technique to probe the valley dynamics can open up a new paradigm to explore the physics of excitons in two-dimensional systems.
