报告题目(Title):Multifunctional Quantum States in Kagome Lattices
报告人(Speaker):赵俊衡(Jun-Hyung Cho)
报告时间(Time):2023年4月21日上午10:00-11:00
报告地点(Venue):实训楼307
报告摘要(Abstract):The two-dimensional kagome lattice consisting of corner-sharing triangles possesses unique electronic structures characterized by flat bands, Dirac cones, and van Hove singularities, thereby providing a novel platform to investigate various topological and correlated phenomena. Recently, a new family of nonmagnetic layered kagome metals AV3Sb5(A = K, Rb, and Cs) has attracted enormous attention due to its intriguing electronic properties of nontrivial topological states, chiral charge density wave, and superconductivity. In this talk, I will present our first-principles density-functional theory studies for three different kinds of kagome systems: i.e., ferromagnetic Fe3Sn2, antiferromagnetic FeSn, and nonmagnetic CsV3Sb5. Our findings demonstrate the presence of a flatband ferromagnetism in Fe3Sn2arising from the highly degenerate and dispersionless manifold state of electrons and the symmetry-protected Dirac fermions in the antiferromagnetic FeSn. I also discuss the origin of the charge density wave, the superconducting pairing mechanism, and the pairing symmetry of superconductivity in CsV3Sb5.
报告人简介:赵俊衡(Jun-Hyung Cho)教授现为韩国汉阳大学教授,1994年在浦项科技大学获物理学博士学位。毕业后分别在德国马普学会Frit-Haber研究所、美国再生能源国际实验室、美国橡树岭国家实验室、美国田纳西大学、中国科学技术大学等多个国际著名科研机构从事研究工作。2013年受聘河南省特聘讲座教授。赵俊衡教授曾获汉阳大学突出贡献教授奖,韩国纳米突出贡献研究奖,韩国光量子中心突出研究奖等。主要通过理论计算从事材料表面生长、金属绝缘相变、高温超导、拓扑半金属等方面的研究工作,发表在国际一流物理期刊上有150余篇,其中在Physical Review Letters、J Am Chem Soc、Naon Letter等顶尖期刊上发表近30余篇。
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理学院
2023年4月17日