讲座主题：Quasi-atom Physics and Chemistry

专家姓名：苗茂生

工作单位：美国加州州立大学

讲座时间：2024年04月18日13:30-15:30

讲座地点：腾讯会议404-152-188

主办单位：烟台大学物理与电子信息学院

内容摘要：

Even though quantum mechanics methods such as DFT can reproduce and predict most of the structures and properties of solid-state compounds, they do not provide a complete framework of concepts that can understand the mechanism of all phenomena. The systematic deviations from current bond theory and structural rules indicate that some key features and concepts of solid-state have been missing. Our recent work suggests that the presence of quasi-atoms is a very general phenomenon that happens in many metals under both zero and finite pressures. In this framework, many metals, especially the alkali and alkaline earth metals and early transition metals, should be viewed as chemical compounds consisting of both metal atoms and quasi-atoms. This is not a simple shift of perspective because it leads to the explanations of many puzzles, such as the structure preference of elemental metals at ambient conditions and under high pressure, and the formation of high-pressure electrides, superconducting superhydrides, intermetallic compounds, and two-dimensional and quasi-one-dimensional materials.

主讲人介绍：

Dr. Maosheng Miao obtained his Ph.D. in physical chemistry at Jilin University in China. He worked at many places as a postdoc and research scientist, including the University of Antwerp, Case Western Reserve University, Washington State University, and the University of California Santa Barbara. Since 2015, he works in the Department of Chemistry and Biochemistry at California State University Northridge. He has more than 20 years of working experience and background in first principles calculations of the atomic and electronic structures of materials and solid-state chemistry. He has worked in many areas of computational materials science, ranging from semiconductor defects, surfaces and interfaces, functional oxides, solid-state lighting materials, two-dimensional materials, and high-pressure physics and chemistry.