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Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3

Author

Listed:
  • Marco Bianchi

    (Interdisciplinary Nanoscience Center, Aarhus University)

  • Dandan Guan

    (Interdisciplinary Nanoscience Center, Aarhus University
    Zhejiang University)

  • Shining Bao

    (Zhejiang University)

  • Jianli Mi

    (Center for Materials Crystallography, Interdisciplinary Nanoscience Center, Aarhus University)

  • Bo Brummerstedt Iversen

    (Center for Materials Crystallography, Interdisciplinary Nanoscience Center, Aarhus University)

  • Philip D.C. King

    (School of Physics and Astronomy, University of St Andrews)

  • Philip Hofmann

    (Interdisciplinary Nanoscience Center, Aarhus University)

Abstract

The surface of a topological insulator plays host to an odd number of linearly-dispersing Dirac fermions, protected against back-scattering by time-reversal symmetry. Such characteristics make these materials attractive not only for studying a range of fundamental phenomena in both condensed matter and particle physics, but also for applications ranging from spintronics to quantum computation. Here, we show that the single Dirac cone comprising the topological state of the prototypical topological insulator Bi2Se3 can co-exist with a two-dimensional electron gas (2DEG), a cornerstone of conventional electronics. Creation of the 2DEG is tied to a surface band-bending effect, which should be general for narrow-gap topological insulators. This leads to the unique situation where a topological and a non-topological, easily tunable and potentially superconducting, metallic state are confined to the same region of space.

Suggested Citation

  • Marco Bianchi & Dandan Guan & Shining Bao & Jianli Mi & Bo Brummerstedt Iversen & Philip D.C. King & Philip Hofmann, 2010. "Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3," Nature Communications, Nature, vol. 1(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1131
    DOI: 10.1038/ncomms1131
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    Cited by:

    1. M. Michiardi & F. Boschini & H.-H. Kung & M. X. Na & S. K. Y. Dufresne & A. Currie & G. Levy & S. Zhdanovich & A. K. Mills & D. J. Jones & J. L. Mi & B. B. Iversen & Ph. Hofmann & A. Damascelli, 2022. "Optical manipulation of Rashba-split 2-dimensional electron gas," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Eva Arianna Aurelia Pogna & Leonardo Viti & Antonio Politano & Massimo Brambilla & Gaetano Scamarcio & Miriam Serena Vitiello, 2021. "Mapping propagation of collective modes in Bi2Se3 and Bi2Te2.2Se0.8 topological insulators by near-field terahertz nanoscopy," Nature Communications, Nature, vol. 12(1), pages 1-11, December.

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