论文标题
山谷 - 磁通量共鸣
Valley-magnetophonon resonance for interlayer excitons
论文作者
论文摘要
由Mose $ _2 $和WSE $ _2 $单层组成的杂词可以托管具有吸引人的特性的光学明亮的层间式激子，例如超级寿命，以及由于Valley极化引起的光发光的明显圆形极化，可以通过循环极化的激发或应用磁场诱导。在这里，我们报告了观察到由Invervalley Hole散射促进的局部层间激子的固有山谷 - 磁通共振。它导致H型和R型堆叠构型在相同的24.2 Tesla的光致发光偏振度的共振增加，尽管它们具有截然不同的激子能量分裂。作为孔间隔散射的微观机制，我们用摩西$ _2 $的手性ta散射在激发态状态下，由远程电子孔交换相互作用混合在一起。
Heterobilayers consisting of MoSe$_2$ and WSe$_2$ monolayers can host optically bright interlayer excitons with intriguing properties such as ultralong lifetimes and pronounced circular polarization of their photoluminescence due to valley polarization, which can be induced by circularly polarized excitation or applied magnetic fields. Here, we report on the observation of an intrinsic valley-magnetophonon resonance for localized interlayer excitons promoted by invervalley hole scattering. It leads to a resonant increase of the photoluminescence polarization degree at the same field of 24.2 Tesla for H-type and R-type stacking configurations despite their vastly different excitonic energy splittings. As a microscopic mechanism of the hole intervalley scattering we identify the scattering with chiral TA phonons of MoSe$_2$ between excitonic states mixed by the long-range electron hole exchange interaction.
