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首页> 外文会议>Conference on Lasers and Electro-Optics Europe;European Quantum Electronics Conference >Optical spectroscopy of valley dynamics and interlayer excitons in transition-metal dichalcogenide monolayers and heterostructures
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Optical spectroscopy of valley dynamics and interlayer excitons in transition-metal dichalcogenide monolayers and heterostructures

机译：过渡金属二卤化硅单层和异质结构中谷底动力学和层间激子的光谱学

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Summary form only given. Monolayer transition-metal dichalcogenides (TMDs) have recently emerged as fascinating novel materials. Like graphene, they can easily be exfoliated from bulk crystals. Unlike graphene, they have a large and direct band gap, making them attractive for potential applications in electronics or optoelectronics. They may also allow for novel device functionalities, as the spin and valley pseudospin degrees of freedom are directly coupled and stabilized by a large spin splitting in the conduction and valence bands. The optical properties of these two-dimensional crystals are dominated by tightly bound electron-hole pairs (excitons) and more complex quasiparticles such as charged excitons (trions) and biexcitons.Combining different TMDs into heterostructures leads to a staggered band alignment, resulting in rapid charge separation and the formation of interlayer excitons. In these heterostructures, the relative crystallographic orientation of adjacent layers (twist angle) offers a new degree of freedom that can influence the interlayer coupling.Here, we report recent results on exciton valley dynamics in WS2 monolayers [1] and on the transition energy of interlayer excitons in WSe2-MoS2 heterostructures.
机译：仅提供摘要表格。最近，单层过渡金属二卤化物（TMD）成为了令人着迷的新颖材料。像石墨烯一样，它们很容易从块状晶体中脱落。与石墨烯不同，它们具有较大的直接带隙，因此使其对于电子或光电子的潜在应用具有吸引力。它们还可以允许新颖的器件功能，因为自旋和谷假自旋自由度通过导带和价带中的大自旋分裂直接耦合并稳定。这些二维晶体的光学特性主要由紧密结合的电子-空穴对（激子）和更复杂的准粒子（如带电激子（三子）和双激子）决定，将不同的TMD结合成异质结构会导致交错排列，导致快速带隙排列电荷分离和层间激子的形成。在这些异质结构中，相邻层的相对晶体学取向（扭转角）提供了可以影响层间耦合的新自由度。在这里，我们报道了有关WS2单层中激子谷动力学[1]和跃迁能的最新结果。 WSe2-MoS2异质结构中的层间激子。

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