Multiphonon Raman Scattering in Transition Metal Dichalcogenide Double Layers,Physica Status Solidi-Rapid Research Letters

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Multiphonon Raman Scattering in Transition Metal Dichalcogenide Double Layers
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-01-03 , DOI: 10.1002/pssr.201900517
Zi-Wu Wang ₁ , Jia-Pei Deng ₁ , Yao Xiao ₁ , Zhi-Qing Li ₁

Affiliation

Herein, multiphonon Raman scattering assisted by the interlayer excitons in double transition metal chalcogenide (TMD) layers based on the Huang–Rhys's model is studied. The processes of multiple longitudinal optical (LO) phonons Raman scattering are presented due to the strong exciton–LO phonon coupling. It is found that the Raman scattering intensity and orders of LO phonon overtones depend on the obtained value of Huang–Rhys factor, which can be tuned obviously by the strength of exciton–LO phonon coupling and interlayer distance between two TMD layers. Meanwhile, temperature dependence of scattering intensities for different orders of LO phonon overtones in the multiphonon processes is discussed. The theoretical results provide significant insight not only for the analysis of multiphonon Raman spectroscopy in experiments, but also for the modulation of optical properties in a series of TMD double layers and Van der Waals heterostructures.

中文翻译：

过渡金属双硫属化物双层中的多声子拉曼散射。

在此，基于黄-里斯模型，研究了双过渡金属硫属化物（TMD）层中层间激子辅助的多声子拉曼散射。由于强激子与LO声子的强耦合，提出了多个纵向光学（LO）声子拉曼散射的过程。研究发现，LO声子泛音的拉曼散射强度和阶数取决于所得的Huang–Rhys因子值，该值可以通过激子与LO声子耦合的强度以及两个TMD层之间的层间距离进行明显调整。同时，讨论了多声子过程中LO声子泛音不同阶次的散射强度与温度的关系。理论结果不仅为实验中的多声子拉曼光谱分析提供了重要的见识，

更新日期：2020-01-03

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