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  • Title: Evidence of topological surface state in three-dimensional Dirac semimetal Cd3As2.
    Author: Yi H, Wang Z, Chen C, Shi Y, Feng Y, Liang A, Xie Z, He S, He J, Peng Y, Liu X, Liu Y, Zhao L, Liu G, Dong X, Zhang J, Nakatake M, Arita M, Shimada K, Namatame H, Taniguchi M, Xu Z, Chen C, Dai X, Fang Z, Zhou XJ.
    Journal: Sci Rep; 2014 Aug 20; 4():6106. PubMed ID: 25139455.
    Abstract:
    The three-dimensional topological semimetals represent a new quantum state of matter. Distinct from the surface state in the topological insulators that exhibits linear dispersion in two-dimensional momentum plane, the three-dimensional semimetals host bulk band dispersions linearly along all directions. In addition to the gapless points in the bulk, the three-dimensional Weyl/Dirac semimetals are also characterized by "topologically protected" surface state with Fermi arcs on their surface. While Cd3As2 is proposed to be a viable candidate of a Dirac semimetal, more investigations are necessary to pin down its nature. In particular, the topological surface state, the hallmark of the three-dimensional semimetal, has not been observed in Cd3As2. Here we report the electronic structure of Cd3As2 investigated by angle-resolved photoemission measurements on the (112) crystal surface and detailed band structure calculations. The measured Fermi surface and band structure show a good agreement with the band structure calculations with two bulk Dirac-like bands approaching the Fermi level and forming Dirac points near the Brillouin zone center. Moreover, the topological surface state with a linear dispersion approaching the Fermi level is identified for the first time. These results provide experimental indications on the nature of topologically non-trivial three-dimensional Dirac cones in Cd3As2.
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