Observation of a three-dimensional topological dirac semimetal phase in high-mobility cd3 as2

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

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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 Cd 3 As 2, 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 × 10 6 â €‰ms â ̂'1 is observed in our samples, where the mobility is known up to 40,000â €‰cm 2 â €‰V â ̂'1 s â ̂'1, suggesting that Cd 3 As 2 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 Cd 3 As 2 opens the door for exploring higher dimensional spin-orbit Dirac physics in a real material.

Original languageEnglish (US)
Article number3786
JournalNature communications
Volume5
DOIs
StatePublished - May 7 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Neupane, M., Xu, S. Y., Sankar, R., Alidoust, N., Bian, G., Liu, C., Belopolski, I., Chang, T. R., Jeng, H. T., Lin, H., Bansil, A., Chou, F., & Hasan, M. Z. (2014). Observation of a three-dimensional topological dirac semimetal phase in high-mobility cd3 as2. Nature communications, 5, [3786]. https://doi.org/10.1038/ncomms4786