2022/05/05(Thu)
11:00 -12:30
五樓第一會議室 5F, 1st Meeting Room
視訊演講 Video Seminar [ Meeting Link / ID: 2519 274 0919 / Password: 123456 ]
Title
Electronic structures of magnetic topological materials
Speaker
張泰榕副教授 (國立成功大學物理學系) Associate Prof. Tay-Rong Chang (Department of Physics, National Cheng Kung Univerity)Abstract
In the past decade, the correlation between symmetry and topology have taken the central stage of modern physics. It has attracted intensive research interests in condensed matter physics and materials science since the discovery of various topological materials such as quantum spin Hall insulators, 3D topological insulators, and inversion-symmetry breaking Weyl semimetals. Despite tremendous progress, the majority of known topological materials are nonmagnetic while the novel magnetic topological materials have remains elusive. In the last few years, the focus has shifted from nonmagnetic phase to magnetic topological material. In this talk, I will introduce our recent prediction on a first intrinsic ferromagnetic axion insulator MnBi8Te13 [1] and the antisite effects in magnetic topological phase transitions [2] via first-principles calculations. If time permits, I will select a few magnetic topological systems to introduce, for example, kagome magnets RMn6Sn6 (R = Tb,Gd) [3,4], the gapless surface states protected by multi topological invariant numbers in EuSn2P2 [5,6], and high temperature anomalous Hall effect in BST/EuIG heterostructure [7].
[1] Chaowei Hu et al., Science advances 6, eaba4275 (2020).
[2] Chaowei Hu et al., Phys. Rev. B 104, 054422 (2021).
[3] Zi-Jia Cheng et al., arXiv:2203.10648 (2022).
[4] J.X.Yin et al., Nature 583, 533 (2020).
[5] Gian Marco Pierantozzi et al., PNAS 119, e2116575119 (2022).
[6] Xin Gui et al., ACS central science 5, 900 (2019).
[7] Wei-Jhih Zou et al., ACS Nano 16, 2369 (2022).
Language
演講語言 (Language): in English