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Optical dispersion of valley-hybridised coherent excitons with momentum-dependent valley polarisation in monolayer semiconductor
2D Materials ( IF 5.5 ) Pub Date : 2020-10-23 , DOI: 10.1088/2053-1583/abb5eb
Lorenz Maximilian Schneider 1 , Shanece S Esdaille 2 , Daniel A Rhodes 2 , Katayun Barmak 3 , James C Hone 2 , Arash Rahimi-Iman 1
Affiliation  

2D excitons in transition-metal dichalcogenides (TMDCs) offer interesting effects related to the valley pseudo-spin degree of freedom and long-range exchange interactions, as well as the coupling with light states. Several theoretical predictions have claimed that the neutral exciton of TMDCs splits into a transversal and longitudinal exciton branch, with the longitudinal one, which is the upper branch, exhibiting an extraordinary strong dispersion in the meV range within the light cone. Historically, this was linked for semiconductor quantum wells to strong far-field optical dipole coupling, or strong electronic long-range exchange interactions. Recently, experiments utilizing Fourier-space spectroscopy have shown that the exciton (exciton–polariton) dispersion can indeed be measured for high-quality hexagonal-BN-encapsulated WSe 2 monolayer samples and can confirm the energy scale. Here, the exciton fine-structure’s pseudo-spin and the valley polarisation are investi...

中文翻译:

单层半导体中谷类杂化相干激子与动量相关的谷类极化的光学色散

过渡金属二硫属化合物(TMDC)中的2D激子提供了与谷拟自旋自由度和远距离交换相互作用以及与光态的耦合有关的有趣效应。一些理论预测声称,TMDC的中性激子分为横向和纵向激子分支,而纵向的激子分支为上部分支,在光锥内的meV范围内表现出非凡的强分散性。从历史上看,这与半导体量子阱与强大的远​​场光学偶极耦合或强大的电子远程交换相互作用有关。最近,利用傅立叶空间光谱法进行的实验表明,对于高品质六角形BN封装的WSe 2单层样品,激子(激子-极化子)色散确实可以测量,并且可以确认能级。在这里,研究了激子精细结构的伪自旋和谷极化。
更新日期:2020-10-30
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