Micro-Raman and Photoluminescence Spectrometer

在这个提议中，请求资助一个共聚焦显微拉曼光致发光光谱仪。该系统将用于晶体和混合量子和纳米材料的综合研究，特别是二维（2D）材料。一个主要的焦点是表征晶体质量和界面性质的二维材料和相关的范德华（vdW）异质堆和杂化结构。这些结构主要是通过微机械剥离和vdW组装制备的。要研究的材料包括半导体过渡金属二硫族化合物（TMDC）、石墨烯、六方氮化硼、二维膜中基于缺陷的量子发射体、磁性和多铁性二维材料、具有晶体相变的二维极性金属、部分嵌入场效应电路的扭曲homo-和异质层，以及混合结构，例如，Mie-Voids与具有强激子光物质相互作用的二维材料结合。重点研究了扭曲双层结构的实验实现和Mott-Hubbard模拟器的研究。自从世界范围内对二维材料的深入研究开始以来，所谓的声子指纹，即利用拉曼光谱实验可获得的声子指纹，已被证明是获取二维材料和相关异质和杂化结构性质的非常重要的工具。声子模式对材料类型和晶体结构、层数、应变、缺陷、载流子密度、温度、层间耦合以及在扭曲层的情况下对两层之间的角度敏感。所提出的共聚焦微拉曼显微镜用于研究和表征这些特性的非破坏性和衍射有限的横向分辨率和高通量使用非谐振拉曼光谱。微拉曼光谱和微光致发光光谱相结合是一种非常有效的方法，可以全面评估结晶固体的质量和均匀性，特别是二维结构和vdW组件。全面和容易地使用这种方法对生成的结构的质量有直接的影响。分析方法的灵敏度以及每次可以分析的样品数量限制了可以制备的结构的质量和数量。因此，可以生产的高质量样品的数量受到表征的吞吐量的限制。所要求的微拉曼和光致发光系统将使这种高质量和高通量的分析，即使是用户谁没有经验的光学设置没有广泛的培训期访问。

In this proposal, the funding of a confocal micro-Raman and photoluminescence spectrometer is requested. This system will be used for the comprehensive investigation of crystalline and hybrid quantum and nanomaterials, in particular two-dimensional (2D) materials. A major focus is on the characterization of the crystal quality and the interfacial properties of 2D materials and related van der Waals (vdW) heterostacks and hybrid structures. Those structures are mostly prepared by micromechanical exfoliation and vdW assembly. Examples of the materials to be studied include semiconducting transition metal dichalcogenides (TMDC), graphene, hexagonal boron nitride, defect-based quantum emitters in 2D membranes, magnetic and multiferroic 2D materials, 2D polar metals with crystal phase transitions, twisted homo- and heterobilayers partially embedded in field-effect circuits, as well as hybrid structures consisting, for example, of Mie-Voids combined with 2D materials with strong excitonic light-matter interaction. A special focus is on the investigation of twisted bilayers for the experimental realization and study of Mott-Hubbard simulators. Since the start of intensive worldwide research on 2D materials, the so-called phonon fingerprint, which is experimentally accessible using Raman spectroscopy, has proven to be a very important tool to access the properties of 2D materials and related hetero- and hybrid structures. The phonon modes are sensitive to type of material and crystal structure, number of layers, strains, defects, charge carrier density, temperature, interlayer coupling, and in the case of twisted layers also to the angle between two layers. The proposed confocal µ-Raman microscope is used to study and characterize those properties non-destructively and with diffraction-limited lateral resolution with high throughput using non-resonant Raman spectroscopy. The combined micro-Raman and Micro-photoluminescence spectroscopy is established as a very powerful method to comprehensively assess the quality and homogeneity of crystalline solids and in particular of 2D structures and vdW assemblies. Comprehensive and easy access to this methodology has a direct effect on the quality of the generated structures. The sensitivity of the analytical methods as wells as the number of samples that can be analyzed per time limits the quality and the quantity of structures that can be prepared. The number of high-quality samples that can be produced is therefore limited by the throughput of the characterization. The requested mirco-Raman and photoluminescence system will make this high-quality and high throughput analysis accessible even to users who are not experienced in optical setups without an extensive training period.