原子级厚度的二维材料具有独特的光电和力学等性质，在光子学、谷电子学、能量存储和转换等众多方面具有重要的应用前景，其丰富的电子态为人们通过外场调控其性质提供了机遇。应变作为一种重要的外场调控方式，能够有效地改变结构和电子结构，产生新的电子和光学性质。因此，应变对二维材料结构、电子和声子等行为的作用机制就成为人们非常关心和急需解决的关键问题。本项目拟采用高压技术施加压缩应变，结合红外显微谱学技术，研究压力做用下二维材料的结构和电子结构演化，以及半导体-金属相变。针对高压实验受限的样品空间、以及二维材料原子级厚度和有限样品尺寸带来的测量挑战，我们发挥同步辐射光源的高亮度优势，通过研制覆盖远红外-近红外的宽波段高压同步辐射红外谱学测量装置，发展二维材料高压同步辐射红外谱学方法，原位研究其压力作用下的电子结构和声子行为，为探索压力导致的新性质和新现象，深入理解其压力调控机制提供重要的物理依据。

Two-dimensional atomic crystals have novel optical, electronic and mechanical properties, which make them have application prospect on opto-electronics, valley electronics energy conversion and storage. The richness of electronic states in two-dimensional atomic crystals provides an opportunity to modify and control their property by applying external field. Strain as an important external field, can modify the structure and electronic structure effectively, and emerge new electronic and optical properties. Therefore, the mechanism of structure change, electron and phonon behaviors under strain becomes very important problem and urgent to be solved. In this proposal, we will apply compressive strain on the two-dimensional atomic crystals by utilizing high pressure technique. By combing infrared spectroscopy technique, the pressure induced crystal structure and electronic structure change, as well as semiconductor-metal transition are plan to be studied. Aim at the challenge from confined space of high pressure cell，atomic thickness of two-dimensional crystals and limited sample size, we will take advantage of the high brightness of synchrotron infrared source to develop high pressure synchrotron infrared spectroscopy device which covers the wavelength from far infrared to near infrared. Through applying high pressure synchrotron infrared spectroscopy to two-dimensional atomic crystals, the electronic structure and phonon behavior under pressure will be in-situ studied. The results will provide important physics evidence for exploring new property and new phenomenon of two-dimensional materials under pressure, and deeply understanding the manipulating mechanism of pressure.