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Aharonov–Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire

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  • Sungjae Cho

    (University of Illinois
    Present address: Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea)

  • Brian Dellabetta

    (University of Illinois)

  • Ruidan Zhong

    (Brookhaven National Laboratory)

  • John Schneeloch

    (Brookhaven National Laboratory)

  • Tiansheng Liu

    (Brookhaven National Laboratory)

  • Genda Gu

    (Brookhaven National Laboratory)

  • Matthew J. Gilbert

    (University of Illinois)

  • Nadya Mason

    (University of Illinois)

Abstract

Aharonov–Bohm oscillations effectively demonstrate coherent, ballistic transport in mesoscopic rings and tubes. In three-dimensional topological insulator nanowires, they can be used to not only characterize surface states but also to test predictions of unique topological behaviour. Here we report measurements of Aharonov–Bohm oscillations in (Bi1.33Sb0.67)Se3 that demonstrate salient features of topological nanowires. By fabricating quasi-ballistic three-dimensional topological insulator nanowire devices that are gate-tunable through the Dirac point, we are able to observe alternations of conductance maxima and minima with gate voltage. Near the Dirac point, we observe conductance minima for zero magnetic flux through the nanowire and corresponding maxima (having magnitudes of almost a conductance quantum) at magnetic flux equal to half a flux quantum; this is consistent with the presence of a low-energy topological mode. The observation of this mode is a necessary step towards utilizing topological properties at the nanoscale in post-CMOS applications.

Suggested Citation

  • Sungjae Cho & Brian Dellabetta & Ruidan Zhong & John Schneeloch & Tiansheng Liu & Genda Gu & Matthew J. Gilbert & Nadya Mason, 2015. "Aharonov–Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire," Nature Communications, Nature, vol. 6(1), pages 1-5, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8634
    DOI: 10.1038/ncomms8634
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