Nano-optical Visualization of Interlayer Interactions in WSe2/WS2 Heterostructures,The Journal of Physical Chemistry Letters

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Nano-optical Visualization of Interlayer Interactions in WSe2/WS2 Heterostructures
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-06-21 , DOI: 10.1021/acs.jpclett.2c01250
Alvaro Rodriguez ₁ , Andrey Krayev ₂ , Matěj Velický ₁ , Otakar Frank ₁ , Patrick Z El-Khoury ₃

Affiliation

The interplay between excitons and phonons governs the optical and electronic properties of transition metal dichalcogenides (TMDs). Even though a number of linear and nonlinear optical-, electron-, and photoelectron-based approaches have been developed and/or adopted to characterize excitons and phonons in single/few-layer TMDs and their heterostructures, no existing method is capable of directly probing ultralow-frequency and interlayer phonons on the nanoscale. To this end, we developed ultralow-frequency tip-enhanced Raman spectroscopy, which allows spectrally and spatially resolved chemical and structural nanoimaging of WSe₂/WS₂ heterostructures. In this work, we apply this method to analyze phonons in nanobubbles that are sustained in these heterobilayers. Our method is capable of directly probing interlayer (de)coupling using our novel structurally sensitive nano-optical probe and the interplay between excitons and interlayer/intralayer phonons through correlation analysis of the recorded spectral images.

中文翻译：

WSe2/WS2异质结构中层间相互作用的纳米光学可视化

激子和声子之间的相互作用决定了过渡金属二硫化物 (TMD) 的光学和电子特性。尽管已经开发和/或采用了许多基于线性和非线性光学、电子和光电子的方法来表征单层/几层 TMD 及其异质结构中的激子和声子，但没有现有方法能够直接探测纳米尺度的超低频和层间声子。为此，我们开发了超低频尖端增强拉曼光谱，它可以对 WSe ₂ /WS _{2进行光谱和空间分辨的化学和结构纳米成像}异质结构。在这项工作中，我们应用这种方法来分析在这些异质双层中持续存在的纳米气泡中的声子。我们的方法能够使用我们新颖的结构敏感纳米光学探针直接探测层间（去）耦合，并通过记录的光谱图像的相关性分析，激子和层间/层内声子之间的相互作用。

更新日期：2022-06-21

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