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Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry

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  • Anil Murani

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Alik Kasumov

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay
    Institute of Microelectronics Technology and High Purity Materials, RAS)

  • Shamashis Sengupta

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Yu A. Kasumov

    (Institute of Microelectronics Technology and High Purity Materials, RAS)

  • V. T. Volkov

    (Institute of Microelectronics Technology and High Purity Materials, RAS)

  • I. I. Khodos

    (Institute of Microelectronics Technology and High Purity Materials, RAS)

  • F. Brisset

    (Institut de Chimie Moléculaire et des Matériaux d'Orsay, Univ. Paris-Sud, Université Paris-Saclay)

  • Raphaëlle Delagrange

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Alexei Chepelianskii

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Richard Deblock

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Hélène Bouchiat

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

  • Sophie Guéron

    (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay)

Abstract

The protection against backscattering provided by topology is a striking property. In two-dimensional insulators, a consequence of this topological protection is the ballistic nature of the one-dimensional helical edge states. One demonstration of ballisticity is the quantized Hall conductance. Here we provide another demonstration of ballistic transport, in the way the edge states carry a supercurrent. The system we have investigated is a micrometre-long monocrystalline bismuth nanowire with topological surfaces, that we connect to two superconducting electrodes. We have measured the relation between the Josephson current flowing through the nanowire and the superconducting phase difference at its ends, the current–phase relation. The sharp sawtooth-shaped phase-modulated current–phase relation we find demonstrates that transport occurs selectively along two ballistic edges of the nanowire. In addition, we show that a magnetic field induces 0–π transitions and ϕ0-junction behaviour, providing a way to manipulate the phase of the supercurrent-carrying edge states and generate spin supercurrents.

Suggested Citation

  • Anil Murani & Alik Kasumov & Shamashis Sengupta & Yu A. Kasumov & V. T. Volkov & I. I. Khodos & F. Brisset & Raphaëlle Delagrange & Alexei Chepelianskii & Richard Deblock & Hélène Bouchiat & Sophie Gu, 2017. "Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15941
    DOI: 10.1038/ncomms15941
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    Cited by:

    1. Chun-Guang Chu & Jing-Jing Chen & An-Qi Wang & Zhen-Bing Tan & Cai-Zhen Li & Chuan Li & Alexander Brinkman & Peng-Zhan Xiang & Na Li & Zhen-Cun Pan & Hai-Zhou Lu & Dapeng Yu & Zhi-Min Liao, 2023. "Broad and colossal edge supercurrent in Dirac semimetal Cd3As2 Josephson junctions," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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