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

@article{Neupane2014ObservationOA,
title={Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2.},
author={Madhab Neupane and Su-Yang Xu and Raman Sankar and Nasser Alidoust and Guang Bian and Chang Liu and Ilya Belopolski and Tay-Rong Chang and Horng-Tay Jeng and Hsin Lin and Arun Bansil and F. C. Chou and M Zahid Hasan},
journal={Nature communications},
year={2014},
volume={5},
pages={
3786
}
}
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… Expand

#### Figures and Topics from this paper

A stable three-dimensional topological Dirac semimetal Cd3As2.
By performing angle-resolved photoemission spectroscopy, a pair of 3D Dirac fermions in Cd3As2 are directly observed, proving that it is a model 3D TDS and by in situ doping it is able to tune its Fermi energy, making it a flexible platform for exploring exotic physical phenomena. Expand
Evidence of Topological Surface State in Three-Dimensional Dirac Semimetal Cd3As2
• H. Yi, +23 authors X. Zhou
• Physics, Medicine
• Scientific reports
• 2014
The electronic structure of Cd3As2 is investigated by angle-resolved photoemission measurements on the crystal surface and detailed band structure calculations and the topological surface state with a linear dispersion approaching the Fermi level is identified for the first time. Expand
Large transverse Hall-like signal in topological Dirac semimetal Cd3As2
From magneto-transport measurements in high quality single crystals of Cd3As2, a small effective mass m* ≈ 0.05 me is determined from the Shubnikov-de Haas (SdH) oscillations, suggesting a possible lifting of the double degeneracy in accord with the helical spin texture at outer and inner Fermi surfaces with opposite chirality predicted by ab initio calculations. Expand
Observation of superconductivity induced by a point contact on 3D Dirac semimetal Cd3As2 crystals.
• He Wang, +7 authors Jian Wang
• Physics, Medicine
• Nature materials
• 2016
These findings may indicate that Cd3As2 crystals under certain conditions could be topological superconductors, which are predicted to support Majorana zero modes or gapless Majorana edge/surface modes in the boundary depending on the dimensionality of the material. Expand
Magneto-optical conductivity study in three-dimensional Dirac semimetals of ZrTe5
Abstract The three-dimensional (3D) Dirac semimetal material of ZrTe5 provides a possible platform for studying 3D Dirac fermions. It can realize both the point-node semimetal phase and line-nodeExpand
Electronic Transport and quantum oscillation of Topological Semimetals
• Materials Science, Physics
• 2019
Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and manyExpand
Weyl semimetal phase in the non-centrosymmetric compound TaAs
Experiments show that TaAs is a three-dimensional topological Weyl semimetal. Three-dimensional (3D) topologicalWeyl semimetals (TWSs) represent a state of quantum matter with unusual electronicExpand
Evolution of Weyl orbit and quantum Hall effect in Dirac semimetal Cd3As2
The evolution of Shubnikov-de Haas oscillations in Dirac semimetal Cd3As2 nanoplates along with a quantum Hall state possibly arising from such Weyl orbit is reported, indicating the dominant role of surface transport. Expand
Two-Carrier Transport Induced Hall Anomaly and Large Tunable Magnetoresistance in Dirac Semimetal Cd3As2 Nanoplates.
The temperature and gate voltage-dependent magnetotransport properties of Cd3As2 nanoplates with Fermi level near the Dirac point are reported and the Hall anomaly demonstrates the two-carrier transport accompanied by a transition from n-type to p-type conduction with decreasing temperature. Expand
Elemental topological Dirac semimetal {\alpha}-Sn with high quantum mobility
• Physics
• 2021
-Sn with a diamond-type crystal structure provides an ideal avenue to investigate novel topological properties owing to its rich diagram of topological phases and simple elemental materialExpand

#### References

SHOWING 1-10 OF 49 REFERENCES
Discovery of a Three-Dimensional Topological Dirac Semimetal, Na3Bi
Na3Bi is established as a model system for 3D TDSs, which can serve as an ideal platform for the systematic study of quantum phase transitions between rich topological quantum states, and the robustness of 3D Dirac fermions in Na3Bi against in situ surface doping is demonstrated. Expand
Three-dimensional Dirac semimetal and quantum transport in Cd3As2
• Physics
• 2013
Based on the first-principles calculations, we recover the silent topological nature of Cd3As2, a well known semiconductor with high carrier mobility. We find that it is a symmetry-protectedExpand
Experimental realization of a three-dimensional Dirac semimetal.
• Physics, Medicine
• Physical review letters
• 2014
The direct observation of the three-dimensional (3D) Dirac semimetal phase in cadmium arsenide by means of angle-resolved photoemission spectroscopy is reported, and it is proved the existence of the long sought 3D Dirac points. Expand
Observation of a bulk 3D Dirac multiplet, Lifshitz transition, and nestled spin states in Na3Bi
Symmetry or topology protected Dirac fermion states in two and three dimensions constitute novel quantum systems that exhibit exotic physical phenomena. However, none of the studied spin-orbitExpand
Dirac semimetal and topological phase transitions in A 3 Bi ( A = Na , K, Rb)
Three-dimensional (3D) Dirac point, where two Weyl points overlap in momentum space, is usually unstable and hard to realize. Here we show, based on the first-principles calculations and effectiveExpand
Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3
• Y. L. Chen, +11 authors Z. Shen
• Chemistry, Medicine
• Science
• 2009
The results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface, and points to promising potential for high-temperature spintronics applications. Expand
Surface electronic structure of the topological Kondo-insulator candidate correlated electron system SmB6.
The authors' observed in-gap Fermi surface oddness tied with the Kramers' point topology, their coexistence with the two-dimensional transport anomaly in the Kondo hybridization regime, as well as their robustness against thermal recycling, collectively provide strong evidence for protected surface metallicity with a Fermani surface whose topology is consistent with the theoretically predicted topological FermI surface. Expand
Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates
• Physics
• 2011
We investigate novel phases that emerge from the interplay of electron correlations and strong spin-orbit interactions. We focus on describing the topological semimetal, a three-dimensional phase ofExpand
Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
Recent experiments and theories have suggested that strong spin–orbit coupling effects in certain band insulators can give rise to a new phase of quantum matter, the so-called topological insulator,Expand
Three-Dimensional Topological Insulators
• Physics
• 2010
Topological insulators in three dimensions are nonmagnetic insulators that possess metallic surface states (SSs) as a consequence of the nontrivial topology of electronic wavefunctions in the bulk ofExpand