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Mass acquisition of Dirac fermions in magnetically doped topological insulator Sb2Te3 films

Journal Article


Abstract


  • We report on the mass acquisition of Dirac fermions by doping Cr into the topmost quintuple layer

    or into the bulk of Sb2Te3 topological insulator films. By careful investigation of the scanning tunneling

    microscopy/spectroscopy on the films, we find that the Landau level spectrum keeps a good quality even at a high

    Cr-doping level, enabling a demonstration of deviation of the zeroth Landau level, induced by the acquisition of

    a mass term in the surface states in the presence of surface or bulk magnetic doping. The magnitude of the mass

    term in the surface states increases with increasing Cr-doping level. Our observation suggests Cr-doped Sb2Te3

    is a promising candidate for the realization of the proposed magnetoelectric effects.

UOW Authors


  •   Jiang, Yeping (external author)
  •   Song, Canli (external author)
  •   Li, Zhi
  •   Chen, Mu (external author)
  •   Greene, Richard L. (external author)
  •   He, Ke (external author)
  •   Wang, Lili (external author)
  •   Chen, Xi (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2015

Citation


  • Jiang, Y., Song, C., Li, Z., Chen, M., Greene, R. L., He, K., Wang, L., Chen, X., Ma, X. & Xue, Q. (2015). Mass acquisition of Dirac fermions in magnetically doped topological insulator Sb2Te3 films. Physical Review B: Condensed Matter and Materials Physics, 92 195418-1-195418-9.

Scopus Eid


  • 2-s2.0-84949639113

Start Page


  • 195418-1

End Page


  • 195418-9

Volume


  • 92

Abstract


  • We report on the mass acquisition of Dirac fermions by doping Cr into the topmost quintuple layer

    or into the bulk of Sb2Te3 topological insulator films. By careful investigation of the scanning tunneling

    microscopy/spectroscopy on the films, we find that the Landau level spectrum keeps a good quality even at a high

    Cr-doping level, enabling a demonstration of deviation of the zeroth Landau level, induced by the acquisition of

    a mass term in the surface states in the presence of surface or bulk magnetic doping. The magnitude of the mass

    term in the surface states increases with increasing Cr-doping level. Our observation suggests Cr-doped Sb2Te3

    is a promising candidate for the realization of the proposed magnetoelectric effects.

UOW Authors


  •   Jiang, Yeping (external author)
  •   Song, Canli (external author)
  •   Li, Zhi
  •   Chen, Mu (external author)
  •   Greene, Richard L. (external author)
  •   He, Ke (external author)
  •   Wang, Lili (external author)
  •   Chen, Xi (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2015

Citation


  • Jiang, Y., Song, C., Li, Z., Chen, M., Greene, R. L., He, K., Wang, L., Chen, X., Ma, X. & Xue, Q. (2015). Mass acquisition of Dirac fermions in magnetically doped topological insulator Sb2Te3 films. Physical Review B: Condensed Matter and Materials Physics, 92 195418-1-195418-9.

Scopus Eid


  • 2-s2.0-84949639113

Start Page


  • 195418-1

End Page


  • 195418-9

Volume


  • 92