报告题目:Topological Vortex Domains vs. Pseudo-Vortex domains

报  告  人:Sang-Wook Cheong,Rutgers Center for Emergent Materials Rutgers, the State University of New Jersey, USA

报告时间:2019-01-10 16:00

报告地点:理科楼郑裕彤讲堂

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 configurations of these domains/domain walls with 2D-vector vorticity can have non-trivial topology, and these topological vortex domains are rather universal, unless long-range interaction such as ferroelastic coupling or dipolar coupling dominates. We have also found vortex-like domain configurations, which have vorticity in energy diagram, but not in real space, and are called pseudo-vortex domains. We will discuss the difference between these two types of domain configurations in a number of quantum materials, especially with coexisting multiple orders of charge/spin/lattice degrees of freedom.