Experimental realization of a three-dimensional Dirac semimetal.

By Sergey V. Borisenko, Q. Gibson, Danil V. Evtushinsky, Volodymyr B. Zabolotnyy, Bernd Büchner, R. Cava. Physical Review Letters, 2013

844 citations recorded by the source corpus.

We report the direct observation of the three-dimensional (3D) Dirac semimetal phase in cadmium arsenide (Cd(3)As(2)) by means of angle-resolved photoemission spectroscopy. We identify two momentum regions where electronic states that strongly disperse in all directions form narrow conelike structures, and thus prove the existence of the long sought 3D Dirac points. This electronic structure naturally explains why Cd(3)As(2) has one of the highest known bulk electron mobilities. This realization of a 3D Dirac semimetal in Cd(3)As(2) not only opens a direct path to a wide spectrum of applications, but also offers a robust platform for engineering topologically nontrivial phases including Weyl semimetals and quantum spin Hall systems.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d6d9eaedf9da9ca50bbfed327e1e77e00cce3e63

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Citations in the corpus

Experimental discovery of Weyl semimetal TaAs (2015, background): “A Dirac semimetal possesses such four-fold degenerate Dirac nodes at the Fermi level (EF) and has been realized recently (10-16).”
Anisotropic Fermi Surface and Quantum Limit Transport in High Mobility Three-Dimensional Dirac Semimetal Cd 3 As 2 (2014, background): “Motivated by theoretical predications [1,2], to date, Na3Bi [3] and Cd3As2 [4,5,10,21] have been identified to be 3D topological Dirac semimetals by angle-resolved photoemission spectroscopy (ARPES).”
Topological node-line semimetal in three-dimensional graphene networks (2014, neutral): “[22–27] On the other hand, comparing with other proposals for Dirac semimetals, the 3D Dirac point here is topologically stable and does not require the protection from any crystalline symmetry.”
The physics of quantum materials (2017, background): “…withapointlikeFermisurfaceiftheFermienergypassesonly throughDiracpoints)werediscoveredjustafewyearsago 83–85 , and the search for additional examples continues; of course, Dirac quasiparticles famously arise in superconductors near nodes of the gap…”
Classification of stable three-dimensional Dirac semimetals with nontrivial topology (2014, methodology): “However, as the equation (12) is violated if [Cn, P]1⁄4 0 is fulfilled, we obtain {Cn, P}1⁄4 0, which immediately leads to the equation (13).”
Nodal-link semimetals (2017, background): “[18] Sergey Borisenko, Quinn Gibson, Danil Evtushinsky, Volodymyr Zabolotnyy, Bernd Büchner, and Robert J.”
Dirac materials (2014, methodology): “For example, lowering the crystal symmetry from C4v down to C4 in Cd3As2 breaks inversion symmetry and splits the Dirac point into two separate Weyl points [111].”