报告题目:
Routes to quantum anomalous Hall effect from magnetic topological insulatorsMnBi2Te4/(Bi2Te3)n
报告人:刘奇航 副教授
邀请人:王琳 教授
报告时间:11月2日(星期一)10:00
报告地点:科技创新大楼C501
摘要
The rising of topological materialsMnBi2Te4/(Bi2Te3)nwith built-in magnetization provides a great platform for the realization of both Chern-insulator and axion-insulator phases, manifesting integer and half-integer quantum anomalous Hall (QAH) effects, respectively [1-3]. Using both model Hamiltonian and first-principles calculations, we demonstrate that rich 2D and 3D topological phase diagrams can be established with the mapping ofMnBi2Te4/(Bi2Te3)nsystems. For the 2D topological phases, we provide design principles to trigger integer QAH states by tuning experimentally accessible knobs, such as slab thickness and magnetization [2]. In the second part of the talk, some experimental progresses and theoretical insights on the issue of the surface gaps inMnBi2Te4/(Bi2Te3)nare discussed (if time permits) [3-6].
References
[1] C. Hu et al.Nat. Commun.11, 97 (2020).
[2] H. Sun et al.Phys. Rev. Lett.123, 096401 (2019).
[3] Y. Hao et al.Phys. Rev. X9, 041038 (2019).
[4] X. Wu et al.Phys. Rev. X10, 031013 (2020).
[5] X. Ma et al. arXiv:2004.09123 (2020).
[6] R. Lu et al. arXiv:2009.04140 (2020).
个人简介
刘奇航,南方科技大学副教授,本科及博士均毕业于北京大学物理学院,曾任美国西北大学博士后、美国科罗拉多大学博尔德分校助理研究员;主要从事以密度泛函理论为主的凝聚态理论研究,研究兴趣包括理解材料中新奇的电学,磁学,光学,缺陷,自旋极化,拓扑等物性,以及功能导向的新型材料设计及预测。工作期间以主要作者身份已发表包括Nat. Phys.、Nat. Commun.、Phys. Rev. X、Phys, Rev. Lett.、Nano Lett.、JACS等多篇学术论文;署名作者共计已发表学术论文60余篇,Google Scholar统计引用超过3700次;2018年入选“国家特聘青年专家”。