报告1题目：Can we generate and transfer chirality?
报告人：Alessandro Stroppa 教授
时间：2023年9月10日(周日)，上午9点
地点：田家炳楼平星报告厅
邀请人：董帅 教授
报告人简介：
Alessandro Stroppa is a Research Director of the CNR-SPIN Institute (Italy) and deputy director of the research unit in L’Aquila (Italy). He received his PhD in Theoretical Condensed Matter Physics from University of Trieste (Italy) in 2006. After 2009, he joined the CNR in Italy where he became permanent staff in 2012. His current research areas deal with solid-state physics and material science. He has published about 138 peer-reviewed papers (h-index=43, Total citations 6744) in theoretical condensed matter in collaboration with experimentalists. In 2017, 5 of his papers were Highly Cited (Source: Web of Science). He is on the World’s top 2% scientists lists published by Stanford University since 2019.
报告摘要：
Chirality is an important structural property: right-handed and left-handed chiral materials have identical chemical composition and connectivity, but they are related by mirror transformation, forming a couple of enantiomers. Chiral materials show unique features: the intrinsic non-centrosymmetry leads to optical rotation, circular dichroism (CD), second-harmonic generation (SHG), piezoelectricity, pyroelectricity, ferroelectricity, and topological quantum properties. In this talk, I will discuss the intriguing interplay between chirality and physical properties in innovative materials, ranging from twisted bilayers (non-magnetic as well magnetic) to chiral hybrid organic-inorganic perovskites.
报告2题目：二维材料面外铁电的第一性原理研究
报告人：任伟 教授
时间：2023年9月10日(周日)，上午10点
地点：田家炳楼平星报告厅
邀请人：董帅 教授
报告人简介：
任伟，上海大学教授，钱伟长学院副院长、量子与分子结构国际中心执行主任。于 2006 年在香港大学获得博士学位，随后在香港科技大学做博士后。曾在美国阿肯色大学担任研究助理教授，2012 年加入上海大学物理系。主要从事计算凝聚态物理和量子材料科学研究，在Nature、Science、PRL、PRB等著名期刊上发表论文200余篇。
报告摘要：
报告将基于第一性原理计算，围绕一些二维（2D）材料，如双层VS2、双层六方氮化硼（h-BN）、层状半导体β-ZrI2中的平面外铁电极化展开。主要结论：（1）双层 VS2 中的铁谷可以将铁电性和反铁磁性耦合在一起，从而实现对磁性的电控制；（2）β-ZrI2 中铁电性的微观起源归因于三层中电子电荷的不对称移动； (3) 在双层 h-BN 的铁电态中，负纵向压电效应和平面外负泊松比可以共存。以上研究结果将为进一步开发基于滑移电子学的铁电性提供重要启示。