SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Topological Insulators (joint session MA/TT)
MA 10.6: Vortrag
Montag, 27. März 2023, 16:30–16:45, HSZ 403
Magnetic dilution effect and topological phase transitions in antiferromagnet Mn1−xPbxBi2Te4 — •Yueh-Ting Yao1, Tiema Qian2, Tay-Rong Chang1,3,4, and Ni Ni2 — 1Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — 2Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA — 3Center for Quantum Frontiers of Research and Technology (QFort), Tainan 701, Taiwan — 4Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan
The interplay between magnetism and topology have taken the central stage of modern condensed matter physics in the past three years. The fine control of magnetism and topology in a magnetic topological insulator is crucial for realizing various novel magnetic topological phases, such as axion insulator, magnetic Weyl semimetals, etc. In this work, we investigate the evolution of magnetism and band topology in Mn1−xPbxBi2Te4 via angle resolved photoemission spectroscopy (ARPES), first-principles calculations, and electronic transports. We present the comprehensive phase diagram by controlling Pb content and magnetism in this alloy system. Moreover, we provide the first topological crystalline insulator with non-trivial glide mirror Chern number in MnBi2Te4-family materials, which is protected by non-symmorphic symmetry arise from antiferromagnetic (AFM) configuration. Our work provides a fruitful platform with continuously tunable magnetism and topology for investigating emergent phenomena and pave a way towards potential new applications of nanoelectronics.