Imaging and Spectroscopy of Advanced Nanomaterials using Electron Microscopy

该计划旨在研究先进材料中原子排列与声子/电子特性之间的相关性，这些材料具有开发热控制/管理，光电子学和量子计算新技术的潜力。主席计划将特别关注纳米结构特征（缺陷和界面）对声子和电子特性的影响。拟议的研究计划包括两个主要目标：i）发现原子排列在纳米材料声子性质中的作用，以更好地理解晶格振动在声子驱动现象中所起的作用。所考虑的材料将包括氧化物界面、热导体、电子材料和量子材料。ii）发现缺陷态和应变在扭曲二维材料和量子材料等新型材料的电子结构中的作用。这项工作将专注于解决在充分研究的材料中未回答的问题，并探索新的未知领域的双电子学和量子材料。这项研究将使用扫描透射电子显微镜，配备像差校正器，单色器和光谱仪，允许埃分辨率成像和亚10 meV光谱。光谱学研究将在真实的和倒易空间中以前所未有的空间和能量分辨率进行，同时保持样品在不同的温度下（150 - 1300 K）。该计划的新奇和独创性在于，它将带来对纳米级传热的更深入的理解，并确定纳米级器件中跨界面传热的光谱响应。此外，还将确定原子级缺陷的光谱振动响应和部分态密度，并将理解缺陷/应变与其电子性质的相关性。这些知识将有助于调整光电性能和解释光电器件的严格实验数据，使人们能够更广泛地了解量子材料的特性。有了这些新知识，研究人员将能够了解新材料的基本特性。（例如热导体、半导体、超导体）和材料的结构-性质关系，这将导致实际应用，如在加拿大工业中开发高效的固态晶体管、太阳能电池板和红外探测器。

This program aims to study the correlation between atomic arrangement and phonon/electronic properties in advanced materials that exhibit potential for the development of novel technologies for heat control/management, optoelectronics, and quantum computing. The Chair program will particularly focus on the effects of nanoscale structural features (defects and interfaces) on phonon and electronic properties. The proposed research program includes two main objectives: i) To discover the role of the atomic arrangement in the phonon properties of nanomaterials to better understand the role played by lattice vibrations in phonon-driven phenomena. The materials considered will include oxide interfaces, thermal conductor, electronic materials, and quantum materials. ii) To discover the role of defect states and strain in the electronic structure of novel materials such as twisted 2D materials and quantum materials. This work will focus on addressing unanswered questions in well-studied materials and explore new uncharted territories of twistronics and quantum materials.The research will use a scanning transmission electron microscope equipped with an aberration corrector, monochromator, and spectrometer allowing angstrom-resolution imaging and sub-10meV spectroscopy. Spectroscopy studies will be performed in real and reciprocal spaces at an unprecedented spatial and energy resolution, while keeping the specimen at different temperatures (150 - 1300 K).The novelty and originality of this program is that it will bring a deeper understanding of nanoscale heat transfer and identify the spectral response of heat transfer across interfaces in nanoscale devices. Furthermore, the spectral vibrational response and partial density of states of atom-scale defects will be also determined and the correlation of defects/strain with their electronic properties will be understood. This knowledge will be beneficial for tuning optoelectronic properties and interpret rigorously experimental data for optoelectronics devices, enabling a broader understanding of quantum material properties.With this new knowledge, researchers will be able to understand the very fundamental characteristics of new materials (e.g. thermal conductors, semiconductors, superconductors) and the structure-property relationship of materials, which will lead to practical applications as development of efficient solid-state transistors, solar panels, and infrared detectors in the Canadian industry.