Coexistence of bulk and surface states probed by Shubnikov–de Haas oscillations in Bi2Se3 with high charge-carrier density

E. K. de Vries, S. Pezzini, M. J. Meijer, N. Koirala, M. Salehi, J. Moon, S. Oh, S. Wiedmann, and T. Banerjee
Phys. Rev. B 96, 045433 – Published 27 July 2017
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Abstract

Topological insulators are ideally represented as having an insulating bulk with topologically protected, spin-textured surface states. However, it is increasingly becoming clear that these surface transport channels can be accompanied by a finite conducting bulk, as well as additional topologically trivial surface states. To investigate these parallel conduction transport channels, we studied Shubnikov–de Haas oscillations in Bi2Se3 thin films, in high magnetic fields up to 30 T so as to access channels with a lower mobility. We identify a clear Zeeman-split bulk contribution to the oscillations from a comparison between the charge-carrier densities extracted from the magnetoresistance and the oscillations. Furthermore, our analyses indicate the presence of a two-dimensional state and signatures of additional states the origin of which cannot be conclusively determined. Our findings underpin the necessity of theoretical studies on the origin of and the interplay between these parallel conduction channels for a careful analysis of the material's performance.

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  • Received 7 March 2017

DOI:https://doi.org/10.1103/PhysRevB.96.045433

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

E. K. de Vries1,*, S. Pezzini2, M. J. Meijer2, N. Koirala3, M. Salehi4, J. Moon3, S. Oh3, S. Wiedmann2, and T. Banerjee1,†

  • 1University of Groningen, Zernike Institute for Advanced Materials, 9747 AG Groningen, The Netherlands
  • 2High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
  • 3Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 4Department of Materials Science and Engineering, Rutgers University, Piscataway, New Jersey 08854, USA

  • *eric.de.vries@rug.nl
  • t.banerjee@rug.nl

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Issue

Vol. 96, Iss. 4 — 15 July 2017

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