Distinct multiple fermionic states in a single topological metal

M. Mofazzel Hosen, Klauss Dimitri, Ashis K. Nandy (), Alex Aperis (), Raman Sankar, Gyanendra Dhakal, Pablo Maldonado, Firoza Kabir, Christopher Sims, Fangcheng Chou, Dariusz Kaczorowski, Tomasz Durakiewicz, Peter M. Oppeneer and Madhab Neupane ()
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M. Mofazzel Hosen: University of Central Florida
Klauss Dimitri: University of Central Florida
Ashis K. Nandy: Uppsala University
Alex Aperis: Uppsala University
Raman Sankar: National Taiwan University, Taipei 10617, Taiwan Institute of Physics, Academia Sinica
Gyanendra Dhakal: University of Central Florida
Pablo Maldonado: Uppsala University
Firoza Kabir: University of Central Florida
Christopher Sims: University of Central Florida
Fangcheng Chou: National Taiwan University, Taipei 10617, Taiwan Institute of Physics, Academia Sinica
Dariusz Kaczorowski: Polish Academy of Sciences
Tomasz Durakiewicz: Los Alamos National Laboratory
Peter M. Oppeneer: Uppsala University
Madhab Neupane: University of Central Florida

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-05233-1

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