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Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators

Author

Listed:
  • Yang Xu

    (Purdue University
    Birck Nanotechnology Center, Purdue University)

  • Ireneusz Miotkowski

    (Purdue University)

  • Yong P. Chen

    (Purdue University
    Birck Nanotechnology Center, Purdue University
    School of Electrical and Computer Engineering, Purdue University)

Abstract

Topological insulators are a novel class of quantum matter with a gapped insulating bulk, yet gapless spin-helical Dirac fermion conducting surface states. Here, we report local and non-local electrical and magneto transport measurements in dual-gated BiSbTeSe2 thin film topological insulator devices, with conduction dominated by the spatially separated top and bottom surfaces, each hosting a single species of Dirac fermions with independent gate control over the carrier type and density. We observe many intriguing quantum transport phenomena in such a fully tunable two-species topological Dirac gas, including a zero-magnetic-field minimum conductivity close to twice the conductance quantum at the double Dirac point, a series of ambipolar two-component half-integer Dirac quantum Hall states and an electron-hole total filling factor zero state (with a zero-Hall plateau), exhibiting dissipationless (chiral) and dissipative (non-chiral) edge conduction, respectively. Such a system paves the way to explore rich physics, ranging from topological magnetoelectric effects to exciton condensation.

Suggested Citation

  • Yang Xu & Ireneusz Miotkowski & Yong P. Chen, 2016. "Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11434
    DOI: 10.1038/ncomms11434
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    Cited by:

    1. Abdulhakim Bake & Qi Zhang & Cong Son Ho & Grace L. Causer & Weiyao Zhao & Zengji Yue & Alexander Nguyen & Golrokh Akhgar & Julie Karel & David Mitchell & Zeljko Pastuovic & Roger Lewis & Jared H. Col, 2023. "Top-down patterning of topological surface and edge states using a focused ion beam," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Jiaqi Cai & Dmitry Ovchinnikov & Zaiyao Fei & Minhao He & Tiancheng Song & Zhong Lin & Chong Wang & David Cobden & Jiun-Haw Chu & Yong-Tao Cui & Cui-Zu Chang & Di Xiao & Jiaqiang Yan & Xiaodong Xu, 2022. "Electric control of a canted-antiferromagnetic Chern insulator," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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