题目一：Structure of Hydrides under High Pressure: Chalcogens and Alkali Metals

报告人：Prof. Jaeyong Kim Hanyang University

报告时间：2026年1月14日（周三）上午9:00

报告摘要：After the initial surge of interest in high-temperature superconductivity in metal hydrides, scientific attention to this field has recently been renewed following reports of above–room-temperature superconductivity in LaSc₂. Toward addressing this grand challenge, we first investigate the structural evolution of alkali metals and chalcogen elements under high pressure using diamond anvil cell (DAC) techniques. In this talk, I will present recent results on the crystal structures and transport properties of various elements under high pressure and discuss possible future directions for advancing this research. In particular, the unusual increase in electrical resistance observed in chalcogen elements, including Se and Te, prior to the onset of superconductivity will be highlighted and discussed.

个人简介：Jaeyong Kim教授现任韩国汉阳大学物理系教授。长期从事极端条件下量子材料的合成、结构表征及物性研究，在高压材料物理、氢存储材料、金属薄膜表征以及能量存储相关材料研究领域具有重要国际影响力。其研究工作聚焦于高压条件下量子材料的结构与电子性质演化、气体分子在金属氧化物表面的反应与结构、复杂材料中的氢吸附与动力学过程，以及准晶材料在氢存储中的应用等方向。Kim教授在同步辐射与高压实验技术方面具有丰富经验，长期推动高压科学在材料与能源研究中的交叉发展。其学术成果广泛发表，在国际高压物理与材料研究领域享有较高学术声誉。

题目二：Optical observation of flat-band charge dynamics in kagome metal CsCr₆Sb₆

报告人：Prof. Soonjae Moon Hanyang University

报告时间：2026年1月14日（周三）上午10:00

报告摘要：Flat band, where the kinetic energy of the electrons is suppressed, is a fertile ground to investigate the exotic phenomena originating from strong electronic correlations. While Kagome lattice is expected to host flat bands, it has been challenging to explore the correlation-induced novel phenomena because the flat bands are located distant from the Fermi level in most Kagome metals. In this presentation, we will discuss optical response of a Kagome metal CsCr6Sb6 which has a flat band at the Fermi level. Our optical data reveal bad metallic characters of the charge dynamics which deviate significantly from that of Fermi-liquid metals. The temperature evolution of the optical spectral weight reveals the crucial role of the Coulomb and Hund interactions for the anomalous charge dynamics. Our results demonstrate that the flat band offers a promising playground for investigating the rich physics arising from strong electronic correlations and interplay of charge, spin, lattice degrees of freedom.

个人简介：Soonjae Moon教授现任韩国汉阳大学物理系教授。研究方向主要集中于量子材料的光学性质研究，尤其关注强关联体系、拓扑量子材料及自旋轨道耦合体系中的低能激发行为。Moon教授长期利用红外与光谱学实验手段研究电荷密度波、拓扑磁振子以及关联电子体系中的能带演化与相变机制，在过渡金属氧化物、kagome金属及自旋轨道耦合材料等体系中取得了一系列重要研究成果。相关工作发表在Physical Review Letters、Physical Review B等国际知名期刊，多次受邀在国际学术会议作报告。

报告地点：超硬实验综合楼5楼A514会议室