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
A stable three-dimensional topological Dirac semimetal Cd3As2.
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Large transverse Hall-like signal in topological Dirac semimetal Cd3As2
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References

SHOWING 1-10 OF 49 REFERENCES
Discovery of a Three-Dimensional Topological Dirac Semimetal, Na3Bi
TLDR
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
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.
TLDR
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
TLDR
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.
TLDR
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
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
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
...
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2
3
4
5
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