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Seminars

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  • Title:Topological material: Intrinsic ferromagnetic axion insulator
  • Start Date/Time:2020-11-24 / 13:30
  • End Date/Time :2020-11-24 / 15:10
    • Speaker:Prof. Tay-Rong Chang (NCKU)
    • Place:R019, Phys. Building
    • Host:Prof. Po-Yao Chang (NTHU)
    • 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 this work, we predict the existence of an intrinsic ferromagnetic axion state in the new magnetic topological material MnBi8Te13 for the first time [1]. Our finding provides a superior material realization to explore zero-field QAH effect, quantized topological magnetoelectric effect, and associated phenomena.

      [1] Chaowei Hu et al., Realization of an intrinsic ferromagnetic topological state in MnBi8Te13, Science Advances 6, eaba4275 (2020).


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