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凝態理論seminar

Evolution of band topology with antisite defects in the Sb-doped MnBi4Te7

演講者 : 廉上葦 博士生 (成功大學物理系)
演講時間 : 2021 / 11 / 17 16:20
理學教學新大樓物理系 5F 36567會議室
Magnetic topological materials attract worldwide attention because the interplay between band topology and magnetism may lead to novel topological quantum phenomena, such as quantum anomalous Hall effect and quantized magnetoelectric effect. Here we propose a tunable magnetic and topological state in Sb doping a newly discovered intrinsic antiferromagnetic (AFM) topological insulator (TI) MnBi4Te7. Our first-principles calculation shows that the topological ground state transfer from AFM TI to ferromagnetic axion insulator in the low doping region, and then exhibit a type-I ferrimagnetic Weyl semimetal that resulted from strong antisite disorder in the high doping region. Our calculation demonstrates that the doping series provides a fruitful platform with continuously tunable magnetism and topology for investigating emergent phenomena.