论文标题
通过涡流梁形成单层过渡金属二分法中的深色激子：光学选择规则
Formation of dark excitons in monolayer transition metal dichalcogenides by a vortex beam: optical selection rules
论文作者
论文摘要
单层过渡金属二进制基因源具有紧密结合的激子，即使在室温下，也可以主导其光电子反应。光束通常用于研究这些材料的极化 - 通常称为光的旋转角动量 - 为令人兴奋的激发激动人心的状态提供了机制。但是，光束还可以通过创建相位前部的螺旋结构来携带轨道角动量。在这项工作中，我们考虑了一个拉格雷 - 高斯束，除了旋转角动量外，还具有轨道角动量，以在单层过渡金属二核苷中产生激子。我们得出了使用对称参数来控制允许过渡到各种激子系列的光学选择规则。我们的对称考虑因素表明，我们可以使用这些高阶光学梁创建深色激子，开辟了新的途径，以创建长寿的深色激子，并有可能利用它们在量子信息处理和存储中。
Monolayer transition metal dichalcogenides host tightly-bound excitons, which dominate their optoelectronic response even at room temperatures. Light beams are often used to study these materials with the polarization - often termed as the spin angular momentum of the light - providing the mechanism for exciting excitonic states. Light beams, however, can also carry an orbital angular momentum by creating helical structures of their phase front. In this work, we consider a Laguerre-Gaussian beam possessing an orbital angular momentum in addition to the spin angular momentum to create excitons in monolayer transition metal dichalcogenides. We derive optical selection rules that govern the allowed transitions to various exciton series using symmetry arguments. Our symmetry considerations show that we can create dark excitons using these high-order optical beams opening up new avenues for creating long-lived dark excitons with the potential of exploiting them in quantum information processing and storage.
