Resonant Raman Scattering of Surface Phonon Polaritons Mediated by Excitons in WSe2 Films,ACS Photonics

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Resonant Raman Scattering of Surface Phonon Polaritons Mediated by Excitons in WSe2 Films
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-10 , DOI: 10.1021/acsphotonics.4c00349
Lanqing Zhou _{1,

2} , Konstantin Wirth ₃ , Minh N. Bui _{1,

2} , Renu Rani _{1,

2} , Detlev Grützmacher _{1,

2} , Thomas Taubner ₃ , Beata E. Kardynał _{1,

2}

Affiliation

Surface phonon polaritons propagating along interfaces of polar dielectrics coexist with excitons in many van der Waals heterostructures, so understanding their mutual interactions is of great interest. Here, we investigate the contribution of type I surface phonon polariton (SPhP) of hBN to the low-temperature resonant-Raman spectra of hBN/WSe₂ heterostructures. When the laser energy is such that the scattered photons have energy close to that of the WSe₂ excitons, the resonantly enhanced Raman signal enables the characterization of even one monolayer-thick hBN. We are able to explain the signal using transfer matrix method simulations of SPhP dispersions, provided that we assume the Raman scattering to be momentum nonconserving, as could be the case if localized WSe₂ exciton states participated in the process. However, we cannot exclude the contribution of the TO and ZO phonons to the measured signal. We further show that resonant Raman scattering from SiO₂ SPhP can also be mediated by WSe₂.

中文翻译：

WSe2 薄膜中激子介导的表面声子极化子的共振拉曼散射

沿极性电介质界面传播的表面声子极化激元与许多范德华异质结构中的激子共存，因此了解它们的相互作用非常有意义。在这里，我们研究了hBN的I型表面声子极化子（SPhP）对hBN/WSe ₂异质结构的低温共振拉曼光谱的贡献。当激光能量使得散射光子的能量接近WSe ₂激子的能量时，共振增强的拉曼信号甚至能够表征单层厚的六方氮化硼。我们能够使用 SPhP 色散的传递矩阵方法模拟来解释信号，前提是我们假设拉曼散射是动量不守恒的，如果局域 WSe ₂激子态参与该过程，则可能是这种情况。然而，我们不能排除 TO 和 ZO 声子对测量信号的贡献。我们进一步表明，SiO ₂ SPhP 的共振拉曼散射也可以由 WSe ₂介导。

更新日期：2024-08-10

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