論文

査読有り
2012年5月29日

Interface metallic states between a topological insulator and a ferromagnetic insulator

Physical Review B - Condensed Matter and Materials Physics
  • Tetsuro Habe
  • ,
  • Yasuhiro Asano

85
19
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.85.195325

We study electronic structures at an interface between a topological insulator and a ferromagnetic insulator by using a three-dimensional two-band model. In usual ferromagnetic insulators, the exchange potential is much larger than the bulk gap size in the topological insulators and electronic structures are asymmetric with respect to the Fermi level. In such situation, we show that unusual metallic states appear under the magnetic moment pointing the perpendicular direction to the junction plane, which cannot be described by the two-dimensional effective model around the Dirac point. When the magnetic moment is in the parallel direction to the plane, the number of Dirac cones becomes even integers. The conclusions obtained in analytical calculations are confirmed by numerical simulations on tight-binding lattice. © 2012 American Physical Society.

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.85.195325

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