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

研究成果: Article同行評審

31 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號241111
期刊Physical Review B - Condensed Matter and Materials Physics
90
發行號24
DOIs
出版狀態Published - 2014 12月 24

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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