Quantum anomalous Hall effect at the interface between magnetic and topological crystalline insulators

ORAL

Abstract

By employing tight-binding and first-principles calculations, we investigate the possible appearance of the quantum anomalous Hall (QAH) effect at the interface between topological crystalline insulators (SnTe, SnSe) and magnetic insulators (EuO, EuS, EuSe). For a surface Dirac cone associated with a band inversion in the bulk, a mass gap acquisition via an effective Zeeman field is a subject of broad interest because of the potential for exotic thin-film states such as the QAH and axionic phases. A number of studies have demonstrated the appearance of such states by using diverse interfacial and magnetic-element-doped systems in agreement with predictions. Although achieving a large mass gap is critical for further investigations and room temperature devices, the microscopic mechanisms determining the size of the mass gap have not been clearly addressed. In this study, we enumerate several combinations of topological crystalline insulators and magnetic insulators in a search for an optimal electronic structure, where a large mass gap is isolated inside a bulk insulating gap. The underlying mechanisms and their dependence on factors such as magnetization orientation will be discussed.

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Presenters

  • Jinwoong Kim

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ-08854, USA, Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, New Jersey

Authors

  • Jinwoong Kim

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ-08854, USA, Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, New Jersey

  • David Vanderbilt

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ-08854, USA, Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, New Jersey, Rutgers University, USA, Rutgers Univ, Physics and Astronomy, Rutgers University, Piscataway, NJ, United States, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA