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Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2
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Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2
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Journal Article
Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2
2014
Overview
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
ms
−1
is observed in our samples, where the mobility is known up to 40,000 cm
2
V
−1
s
−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.
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 Cd
3
As
2
system.
Publisher
Nature Publishing Group UK,Nature Publishing Group
