报告题目：Reticular Frameworks: Insights into Topological States and Beyond
报告人：倪小娟
主持人（邀请人）：蒋青、王同辉
报告时间：2025年06月19日 15:00-17:00
报告地点：机械材料馆209
主办单位：汽车材料教育部重点实验室，18禁-成人18禁-18禁視頻
摘要：
The design and manipulation of the chemical characteristics of covalent organic frameworks (COFs) and metal-organic frameworks (MOFs), collectively known as reticular frameworks, offers a new avenue for developing functional materials, particularly in the context of topological properties. In this presentation, I will first introduce an effective framework for precise band engineering in two-dimensional (2D) polymer networks, which uncovers the fundamental relationships among the electronic structures of COFs, the symmetries of their 2D lattices, and the frontier molecular orbitals of their building units. Based on this approach, I will discuss the realization of a topological Dirac semimetal phase in a 2D phthalocyanine-based COF composed solely of light elements, where the application of external strain induces a topological phase transition from an insulator to a Dirac semimetal through band inversion. I will then focus on heterotriangulene-based COFs, demonstrating how variations in heteroatoms and linker units can enable the prediction of higher-order topological insulator phase. Additionally, I will provide a brief overview of my theoretical investigations into noncollinear magnetic and altermagnetic properties in MOFs. Overall, this presentation will highlight how these studies advance our understanding of reticular frameworks and demonstrate the potential of molecular design for exploring topological and magnetic properties beyond conventional inorganic materials.
报告人简介：
Xiaojuan Ni is currently a Research Scientist in the Department of Chemistry and Biochemistry at The University of Arizona, working with Professor Jean-Luc Brédas. Dr. Ni completed her Ph.D. in Materials Science and Engineering at the University of Utah with the mentorship of Professor Feng Liu, where her dissertation was recognized with both university-level and international awards. Her research interests lie at the intersection of condensed matter physics and materials chemistry, with a specific emphasis on understanding the fundamental relationship between materials properties and their underlying structures. She utilizes advanced computational methods to understand and predict novel states arising from the interplay of charge, spin, and lattice degrees of freedom, as well as from external stimuli in materials used for electronic, spintronics, and energy applications.
