将两种二维材料按一定扭转角度堆垛到一起可形成具有新颖性质的二维范德华异质结，简称二维异质结。二维异质结不仅被用来调控二维材料的物理性质，而且被广泛应用于各种高效光电器件。界面相互作用、莫氏图样对物性的调控、晶格振动的局域性或扩展性以及电子能带结构的光学探测等物理问题是二维异质结科学研究中的一系列关键问题。本项目拟利用拉曼散射技术在多波长激发、低温和常温以及超高光谱分辨等条件下，研究二维莫氏图样超晶格势场对二维异质结拉曼模式的影响机制，通过高频声子模的达维多夫劈裂来研究界面相互作用对二维异质结子系统拉曼模式的影响，通过共振拉曼散射系统研究异质结的晶格动力学及其声子振动模的局域或扩展特性以及研究二维异质结子系统的双共振拉曼散射本质。本项目对全面深入理解二维异质结的晶格振动模式和电子能带结构与其子系统的关联性，推动二维异质结在光电子器件中的应用有重要意义。

Two two-dimensional (2D) materials can be stacked together by a specific twist angle to form a 2D van der Waals heterostructures (vdWHs) with novel properties. 2D vdWHs are not only used to manipulate the physical properties of 2D materials, but also widely exist in various photonic and electronic devices. Interfacial interaction, manipulating physical properties by Moiré pattern, localization or extension of lattice vibration, optically probing electronic band structure are several key problems of scientific researches in 2D vdWHs. This project intends to study Raman spectroscopy of 2D vdWHs under experimental conditions of multiple wavelength excitations, different temperatures and high spectral resolution measurement to investigate the mechanism of Raman modes modulated by the 2D superlattice potential field of Moiré pattern, to study interfacial interaction of 2D vdWHs through the Davydov splitting of the high frequency phonon modes, to reveal the lattice dynamics of 2D vdWHs by resonance Raman scattering along with the localization-like or extension-like characteristics of atomic displacement of phonon vibration modes, and to investigate the intrinsic natures of double resonance Raman scattering in 2D vdWHs. The project is helpful to comprehensively understand the correlation between 2D vdWHs and 2D subsystem on the lattice vibration modes and the electronic band structures as well as to promote the application of 2D vdWHs in optoelectronic devices.