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學術活動
南方大學劉啟航副教授講座通知
發布人:王燚??發布時間:2019-08-25?? 瀏覽次數:10

應物理學院李偉奇副教授邀請澳门赌博网APP下载,南方科技大學劉奇航研究員將于827日對物理學院進行訪問,訪問期間將舉行學術報告并進行交流澳门赌博网APP下载,歡迎各位感興趣的師生參加。

題目:磁性拓撲絕緣體的反常量子霍爾效應

時間827日上午10:00

地點:理學樓308

摘要As one of paradigmatic phenomena in condensed matter physics, the quantum anomalous Hall effect (QAHE) in stoichiometricChern insulators has drawn great interest for years. Recently, MnBi2Te4 thin films manifests the QAH effect at a record high temperature of 4.5 K in the forced ferromagnetic state above 10 Tesla. By realizing a bulk MnBi4Te7 with alternating [MnBi2Te4]and [Bi2Te3] layers, we suggest that it is a Z2 antiferromagnetic topological insulator with a small out-of-plane saturation field of ~ 0.2 Tesla. Using model Hamiltonian analysis and first-principle calculations, we then establish a topological phase diagram and map on it with different two-dimensional configurations, which is taken from the recently-grown magnetic topological insulators MnBi4Te7 and MnBi6Te10. These configurations manifest various topological phases, including quantum spin Hall effect with and without time-reversal symmetry, as well as QAHE. We then provide design principles to trigger QAHE by tuning experimentally accessible knobs, such as slab thickness and magnetization. Our work reveals that superlattice-like magnetic topological insulators with tunable exchange interaction serve as an ideal platform to realize the long-sought QAHE in pristine compounds.

報告人簡介:劉奇航,南方科技大學物理系副教授澳门赌博网APP下载,中組部2018年“國家特聘青年專家”入選者,主要從事以密度泛函理論為主的凝聚態理論研究,聚焦真實材料澳门赌博网APP下载。研究興趣包括理解材料中新奇的電學,磁學,光學,缺陷,自旋極化澳门赌博网APP下载,拓撲等性質及它們的耦合澳门赌博网APP下载,以及功能導向的新型材料設計及預測。劉奇航博士以第一作者或通訊作者身份已發表包括Nature. Physics、Nature. Communications、Physical.Review. X、Physical. Review. Letters澳门赌博网APP下载、Nano Letters澳门赌博网APP下载、Advanced. Functional. Materials.等多篇學術論文澳门赌博网APP下载澳门赌博网APP下载;署名作者共計已發表學術論文40余篇,Google Scholar統計引用超過2900次;擔任Physical. Review. Letters、Nano Letters、Advanced. Materials等期刊審稿人澳门赌博网APP下载。


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