Imaging and Spectroscopy of Advanced Nanomaterials using Electron Microscopy

该项目旨在研究先进材料中原子排列与声子/电子特性之间的关系，这些材料在热控制/管理、光电子学和量子计算等新技术的发展方面具有潜力。主席计划将特别关注纳米级结构特征（缺陷和界面）对声子和电子特性的影响。提出的研究计划包括两个主要目标：1)发现原子排列在纳米材料声子特性中的作用，以更好地理解晶格振动在声子驱动现象中的作用。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。这项工作将集中在解决未解决的问题，充分研究材料和探索新的未知领域的双电子学和量子材料。该研究将使用配备像差校正器、单色仪和光谱仪的扫描透射电子显微镜，可实现埃分辨率成像和亚10mev光谱。光谱研究将以前所未有的空间和能量分辨率在实空间和互易空间中进行，同时将样品保持在不同的温度下（150 - 1300 K）。该计划的新颖性和独创性在于，它将带来对纳米尺度传热的更深层次的理解，并确定纳米尺度器件中跨界面传热的光谱响应。此外，还将确定原子尺度缺陷的谱振动响应和态的偏密度，并了解缺陷/应变与其电子性质的相关性。这些知识将有助于调整光电子特性和解释光电子器件的严格实验数据，从而更广泛地理解量子材料的特性。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，这将导致加拿大工业中高效固态晶体管、太阳能电池板和红外探测器的实际应用。

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.