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Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2

Author

Listed:
  • Madhab Neupane

    (Joseph Henry Laboratory, Princeton University)

  • Su-Yang Xu

    (Joseph Henry Laboratory, Princeton University)

  • Raman Sankar

    (Center for Condensed Matter Sciences, National Taiwan University)

  • Nasser Alidoust

    (Joseph Henry Laboratory, Princeton University)

  • Guang Bian

    (Joseph Henry Laboratory, Princeton University)

  • Chang Liu

    (Joseph Henry Laboratory, Princeton University)

  • Ilya Belopolski

    (Joseph Henry Laboratory, Princeton University)

  • Tay-Rong Chang

    (National Tsing Hua University)

  • Horng-Tay Jeng

    (National Tsing Hua University
    Institute of Physics, Academia Sinica)

  • Hsin Lin

    (Graphene Research Centre, National University of Singapore)

  • Arun Bansil

    (Northeastern University)

  • Fangcheng Chou

    (Center for Condensed Matter Sciences, National Taiwan University)

  • M. Zahid Hasan

    (Joseph Henry Laboratory, Princeton University
    Princeton Center for Complex Materials, Princeton University)

Abstract

Symmetry-broken three-dimensional (3D) topological Dirac semimetal systems with strong spin-orbit coupling can host many exotic Hall-like phenomena and Weyl fermion quantum transport. Here, using high-resolution angle-resolved photoemission spectroscopy, we performed systematic electronic structure studies on Cd3As2, which has been predicted to be the parent material, from which many unusual topological phases can be derived. We observe a highly linear bulk band crossing to form a 3D dispersive Dirac cone projected at the Brillouin zone centre by studying the (001)-cleaved surface. Remarkably, an unusually high in-plane Fermi velocity up to 1.5 × 106 ms−1 is observed in our samples, where the mobility is known up to 40,000 cm2 V−1s−1, suggesting that Cd3As2 can be a promising candidate as an anisotropic-hypercone (three-dimensional) high spin-orbit analogue of 3D graphene. Our discovery of the Dirac-like bulk topological semimetal phase in Cd3As2 opens the door for exploring higher dimensional spin-orbit Dirac physics in a real material.

Suggested Citation

  • Madhab Neupane & Su-Yang Xu & Raman Sankar & Nasser Alidoust & Guang Bian & Chang Liu & Ilya Belopolski & Tay-Rong Chang & Horng-Tay Jeng & Hsin Lin & Arun Bansil & Fangcheng Chou & M. Zahid Hasan, 2014. "Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4786
    DOI: 10.1038/ncomms4786
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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.
    2. Cong Li & Jianfeng Zhang & Yang Wang & Hongxiong Liu & Qinda Guo & Emile Rienks & Wanyu Chen & Francois Bertran & Huancheng Yang & Dibya Phuyal & Hanna Fedderwitz & Balasubramanian Thiagarajan & Macie, 2023. "Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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