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  • Title: Distinct multiple fermionic states in a single topological metal.
    Author: Hosen MM, Dimitri K, Nandy AK, Aperis A, Sankar R, Dhakal G, Maldonado P, Kabir F, Sims C, Chou F, Kaczorowski D, Durakiewicz T, Oppeneer PM, Neupane M.
    Journal: Nat Commun; 2018 Aug 01; 9(1):3002. PubMed ID: 30068909.
    Abstract:
    Among the quantum materials that have recently gained interest are the topological insulators, wherein symmetry-protected surface states cross in reciprocal space, and the Dirac nodal-line semimetals, where bulk bands touch along a line in k-space. However, the existence of multiple fermion phases in a single material has not been verified yet. Using angle-resolved photoemission spectroscopy (ARPES) and first-principles electronic structure calculations, we systematically study the metallic material Hf2Te2P and discover properties, which are unique in a single topological quantum material. We experimentally observe weak topological insulator surface states and our calculations suggest additional strong topological insulator surface states. Our first-principles calculations reveal a one-dimensional Dirac crossing-the surface Dirac-node arc-along a high-symmetry direction which is confirmed by our ARPES measurements. This novel state originates from the surface bands of a weak topological insulator and is therefore distinct from the well-known Fermi arcs in semimetals.
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