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Optimizing Bi2xSbxTe3ySey solid solutions to approach the intrinsic topological insulator regime

Zhi Ren, A. A. Taskin, Satoshi Sasaki, Kouji Segawa, and Yoichi Ando
Phys. Rev. B 84, 165311 – Published 6 October 2011
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Abstract

To optimize the bulk-insulating behavior in the topological insulator materials having a tetradymite structure, we have synthesized and have characterized single-crystal samples of Bi2xSbxTe3ySey solid solution at various compositions. We have elucidated that there are a series of intrinsic compositions where the acceptors and donors compensate each other and present a maximal bulk-insulating behavior. At such compositions, the resistivity can become as large as several Ω cm at low temperatures, and one can infer the role of the surface-transport channel in the nonlinear Hall effect. In particular, the composition of Bi1.5Sb0.5Te1.7Se1.3 achieves the lowest bulk carrier density and appears to be best suited for surface-transport studies.

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  • Received 14 June 2011

DOI:https://doi.org/10.1103/PhysRevB.84.165311

©2011 American Physical Society

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Optimizing Topological Insulators

Published 6 October 2011

Tweaking the bulk properties of a topological insulator reveals the behavior of its surface states.

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Authors & Affiliations

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

  • Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan

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Issue

Vol. 84, Iss. 16 — 15 October 2011

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