12月17日学术报告:Topological Vortex Domains in Quantum Materials

时间:2018-12-06浏览:148

学术报告:Topological Vortex Domains  in Quantum Materials

报告人:     Sang-Wook Cheong 教授(美国罗格斯大学)

时间:  1217日(周一),下午2:00

地点:   田家炳楼南203

邀请人:董帅。欢迎参加!

 

报告人简介:国际著名材料物理学家,罗格斯大学 Board of Governors教授, Henry Rutgers教授,量子材料合成中心创始主任、罗格斯新兴材料中心创始主任。美国物理学会会士、美国物理学会James C. McGroddy奖获得者,韩国Ho-am奖获得者。曾任PRL部门副主编,现任Npj Quant. Mater.主编。本科毕业于韩国首尔大学、博士毕业于加州大学洛杉矶分校。曾在洛斯阿拉莫斯国家实验室、贝尔实验室从事研究工作。在牛津大学、东京大学等多所国际知名大学任访问教授。发表论文700余篇,其中Nature/Science 10篇,PRL130余篇,引用46500余次,其中6篇单篇引用过1000次,H指数1022003WoS全球高被引物理学家第13名。

 

报告摘要:Engineering of domains and domain boundaries is quintessential for technological exploitation of numerous functional materials. However, it has only recently realized that the configuration of these domains/domain boundaries can have non-trivial topology. We will discuss a new topological classification scheme of domain/domain boundary configurations with Ising-type or two-dimensional order parameters: Zm×Zn domains (m directional variants and n translational antiphases) and Zl vortices (where l number of domains and that of domain boundaries merge). This classification, with the concept of topological protection and topological charge conservation, has been applied to a wide range of materials such as improper ferroelectric R(Mn,Fe)O3, antipolar In(Mn,Ga)O3, hybrid improper ferroelectric (Ca,Sr)3Ti2O7, chiral (and ferromagnetic) Fe1/3TaS2, magnetic-superconducting Sr2VO3FeAs, magnetic a-Fe2O3, and CDW systems such as 2H-TaSe2. We will also discuss the emergent physical properties of domain boundaries, distinct from those of domains. The presented topological consideration provides a basis in understanding the formation, kinetics, manipulation and property optimization of domains/domain boundaries in quantum materials.
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