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Tunable Dirac cone in the topological insulator Bi2-xSbxTe3-ySey

Author

Listed:
  • T. Arakane

    (WPI Research Center, Advanced Institute for Materials Research, Tohoku University)

  • T. Sato

    (Tohoku University)

  • S. Souma

    (WPI Research Center, Advanced Institute for Materials Research, Tohoku University)

  • K. Kosaka

    (Tohoku University)

  • K. Nakayama

    (Tohoku University)

  • M. Komatsu

    (Tohoku University)

  • T. Takahashi

    (WPI Research Center, Advanced Institute for Materials Research, Tohoku University
    Tohoku University)

  • Zhi Ren

    (Institute of Scientific and Industrial Research, Osaka University, Ibaraki)

  • Kouji Segawa

    (Institute of Scientific and Industrial Research, Osaka University, Ibaraki)

  • Yoichi Ando

    (Institute of Scientific and Industrial Research, Osaka University, Ibaraki)

Abstract

The three-dimensional topological insulator is a quantum state of matter characterized by an insulating bulk state and gapless Dirac cone surface states. Device applications of topological insulators require a highly insulating bulk and tunable Dirac carriers, which has so far been difficult to achieve. Here we demonstrate that Bi2-xSbxTe3-ySey is a system that simultaneously satisfies both of these requirements. For a series of compositions presenting bulk-insulating transport behaviour, angle-resolved photoemission spectroscopy reveals that the chemical potential is always located in the bulk band gap, whereas the Dirac cone dispersion changes systematically so that the Dirac point moves up in energy with increasing x, leading to a sign change of the Dirac carriers at x~0.9. Such a tunable Dirac cone opens a promising pathway to the development of novel devices based on topological insulators.

Suggested Citation

  • T. Arakane & T. Sato & S. Souma & K. Kosaka & K. Nakayama & M. Komatsu & T. Takahashi & Zhi Ren & Kouji Segawa & Yoichi Ando, 2012. "Tunable Dirac cone in the topological insulator Bi2-xSbxTe3-ySey," Nature Communications, Nature, vol. 3(1), pages 1-5, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1639
    DOI: 10.1038/ncomms1639
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    Cited by:

    1. Gang Shi & Fan Gao & Zhilin Li & Rencong Zhang & Igor Gornyi & Dmitri Gutman & Yongqing Li, 2023. "Quantum corrections to the magnetoconductivity of surface states in three-dimensional topological insulators," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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