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Quantized surface transport in topological Dirac semimetal films

Author

Listed:
  • Shinichi Nishihaya

    (University of Tokyo)

  • Masaki Uchida

    (University of Tokyo
    Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST))

  • Yusuke Nakazawa

    (University of Tokyo)

  • Ryosuke Kurihara

    (University of Tokyo)

  • Kazuto Akiba

    (University of Tokyo)

  • Markus Kriener

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Atsushi Miyake

    (University of Tokyo)

  • Yasujiro Taguchi

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Masashi Tokunaga

    (University of Tokyo)

  • Masashi Kawasaki

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Unconventional surface states protected by non-trivial bulk orders are sources of various exotic quantum transport in topological materials. One prominent example is the unique magnetic orbit, so-called Weyl orbit, in topological semimetals where two spatially separated surface Fermi-arcs are interconnected across the bulk. The recent observation of quantum Hall states in Dirac semimetal Cd3As2 bulks have drawn attention to the novel quantization phenomena possibly evolving from the Weyl orbit. Here we report surface quantum oscillation and its evolution into quantum Hall states in Cd3As2 thin film samples, where bulk dimensionality, Fermi energy, and band topology are systematically controlled. We reveal essential involvement of bulk states in the quantized surface transport and the resultant quantum Hall degeneracy depending on the bulk occupation. Our demonstration of surface transport controlled in film samples also paves a way for engineering Fermi-arc-mediated transport in topological semimetals.

Suggested Citation

  • Shinichi Nishihaya & Masaki Uchida & Yusuke Nakazawa & Ryosuke Kurihara & Kazuto Akiba & Markus Kriener & Atsushi Miyake & Yasujiro Taguchi & Masashi Tokunaga & Masashi Kawasaki, 2019. "Quantized surface transport in topological Dirac semimetal films," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10499-0
    DOI: 10.1038/s41467-019-10499-0
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