Shubnikov-de Haas oscillations from topological surface states of metallic Bi2 Se2.1 Te0.9

Keshav Shrestha, Vera Marinova, Bernd Lorenz, Paul C.W. Chu

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31 Citations (Scopus)

Abstract

We have studied the quantum oscillations in the conductivity of metallic, p-type Bi2Se2.1Te0.9. The dependence of the oscillations on the angle of the magnetic field with the surface as well as the Berry phase determined from the Landau level fan plot indicate that the observed oscillations arise from surface carriers with a characteristic Dirac dispersion. Several quantities characterizing the surface conduction are calculated employing the Lifshitz-Kosevich theory. The low value of the Fermi energy with respect to the Dirac point is consistent with the metallic character of the bulk hole carriers. We conclude that, due to the peculiar shape of the valence band, the Shubnikov-de Haas oscillations of the bulk carriers are shifted to higher magnetic fields, which allows for the detection of the quantum oscillations from the topological surface states at a lower field.

Original languageEnglish
Article number241111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number24
DOIs
Publication statusPublished - 2014 Dec 24

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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