Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se

Zhi Ren; A. A. Taskin; Satoshi Sasaki; Kouji Segawa; Yoichi Ando

doi:10.1103/PhysRevB.82.241306

Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se

Materials Science 2015-05-20 v1

Authors: Zhi Ren , A. A. Taskin , Satoshi Sasaki , Kouji Segawa , Yoichi Ando

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Abstract

Topological insulators are predicted to present novel surface transport phenomena, but their experimental studies have been hindered by a metallic bulk conduction that overwhelms the surface transport. We show that a new topological insulator, Bi2Te2Se, presents a high resistivity exceeding 1 Ohm-cm and a variable-range hopping behavior, and yet presents Shubnikov-de Haas oscillations coming from the surface Dirac fermions. Furthermore, we have been able to clarify both the bulk and surface transport channels, establishing a comprehensive understanding of the transport in this material. Our results demonstrate that Bi2Te2Se is the best material to date for studying the surface quantum transport in a topological insulator.

Keywords

topological insulator Bi2Te2Se surface quantum oscillations Shubnikov-de Haas effect bulk resistivity variable-range hopping

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@article{arxiv.1011.2846,
  title  = {Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se},
  author = {Zhi Ren and A. A. Taskin and Satoshi Sasaki and Kouji Segawa and Yoichi Ando},
  journal= {arXiv preprint arXiv:1011.2846},
  year   = {2015}
}

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4 pages, 3 figures

Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se

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