Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2
By M. Neupane, Su-Yang Xu, R. Sankar, N. Alidoust, G. Bian, Chang Liu, I. Belopolski, Tay-Rong Chang, H. Jeng, Hsin Lin and 3 more. Nature Communications, 2013
728 citations recorded by the source corpus.
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. Topological Dirac semimetals constitute a promising platform for the study of quantum Hall phenomena and Weyl fermion transport. Using high-resolution angle-resolved photoemission spectroscopy, Neupane et al. identify the topological bulk Dirac semimetal phase in a Cd3As2system.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/2caa216b428c5d68b9fcadca023d1e103d6c0265
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Citations in the corpus
- Observation of Topological Nodal Fermion Semimetal Phase in ZrSiS (2016, background): “[6] M.”
- Angle-resolved photoemission studies of quantum materials (2020, neutral): “Dirac semimetals were first observed by ARPES in Na3Bi (Liu et al., 2014d) and Cd3As2 (Borisenko et al., 2014; Liu et al., 2014c; Neupane et al., 2014), with the salient features summarized in Fig.”
- Inhomogeneous Weyl and Dirac Semimetals: Transport in Axial Magnetic Fields and Fermi Arc Surface States from Pseudo-Landau Levels (2016, background): “[60] Madhab Neupane, Su-Yang Xu, Raman Sankar, Nasser Alidoust, Guang Bian, Chang Liu, Ilya Belopolski, TayRong Chang, Horng-Tay Jeng, Hsin Lin, Arun Bansil, Fangcheng Chou, and M.”