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Giant Dzyaloshinskii-Moriya interactions and topological Kerr effects in 2D magnets via element mutation

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报告题目   Giant Dzyaloshinskii-Moriya interactions and topological Kerr effects in 2D magnets via element mutation
报告人   张顺洪 特任研究员
报告人单位   中国科学技术大学微尺度国家研究中心
报告时间   2022-05-30 15:00:00
报告地点   公海安卓版6600物质科研B楼B0902会议室
主办单位   公海安卓版6600、国际功能材料量子设计中心(ICQD)
报告介绍

Abstract:

  Realization of long-range magnetic order in two-dimensional (2D) van der Waals magnets facilitates exploitation of exotic emergent magnetic properties in reduced dimensionality. Here we report our recent progresses surrounding rich topological properties of 2D magnets via element mutation. Starting with the parental 2D ferromagnet CrI3, we first show that proper mutation of Cr with neighboring transition metal elements lead to new stable 2D ferromagnets CrMnI6 and CrVI6, which exhibit nontrivial band topology upon optimal band-filling. Next we reveal giant Dzyaloshinskii-Moriya (DM) interactions in these magnets, which stem from the in-plane inversion symmetry breaking and can give rise to intriguing topological excitations. In particular, for monolayered CrMnI6, we predict the existence of strong anisotropic biquadratic exchange in addition to the giant DM interaction, which in turn give rise to bimeronic excitations that exhibit magnon-driven ratchet dynamics. For the newly predicted and synthesized CrVI6, we reveal striking bump features in the hysteresis loop of the Kerr rotation angles, and the resultant topological Kerr effect (TKE) can be exploited as a magneto-optical fingerprint of skyrmionic excitations detected in a non-invasive manner.

 

报告人简介:

  张顺洪博士,中国科学技术大学国际功能材料量子设计中心特任研究员,2016年获得北京大学工学院博士学位,2016-2018年在清华大学高等研究院开展博士后研究工作(获得首批“博新计划”资助),2018年加入中国科学技术大学,主要从事低维材料、拓扑电子材料及量子磁性材料的模拟研究,曾在PNAS、JACS、Adv. Funct. Mater.、Nano Lett.、PRB/Mater/Research等学术期刊发表论文40余篇。近期主要开展量子磁性材料中复杂磁相互作用及低能拓扑磁激发等物性研究。

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