主持人:钟定永 教授
报告简介: In the first part of this talk, I will present the synthesis of four-, six- and eight-membered tetraphenylethylene (TPE)-based macrocycles on Ag(111) via on-surface Ullmann coupling reactions. Their unique chemical and physical properties, such as intrinsic inner cavities and aromaticity/antiaromaticity make these systems appealing building blocks for functional supramolecular materials. The as-synthesized macrocycles are spontaneously segregated on the surface and self-assemble as large-area two-dimensional mono-component supramolecular crystals. Combined in-situ characterized by scanning tunneling spectroscopic and computational analysis evidence that the macrocycles undergo structural and orbital symmetry breaking due to extended conjugation in the macrocycles. In the second part, I will show that TPE-based oligomers containing open-shell radicals represent a unique platform for exploring the quantum critical point in Kondo systems. The competition of inter-radical antiferromagnetic coupling and the Kondo screening leads to Kondo chains, which offers opportunities to realize artificial heavy fermion systems using organic radicals.
报告人简介:林念,香港科技大学物理系教授。1991年毕业于同济大学,1997年获得香港科技大学博士学位。之后于1997年11月至1999年10月瑞典Linkoping大学做博士后。1999年11月至2007年7月在德国马普研究所做课题组组长。2007年8月至2014年6月在香港科技大学物理系任副教授,博士生导师, 2014年7月至今在香港科技大学物理系任教授,博士生导师。主要研究方向是二维金属有机量子材料的合成与表征、单分子电荷传输与能量转换。