Distinct Multiple Fermionic States In A Single Topological Metal

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.

Publication Date

12-1-2018

Publication Title

Nature Communications

Volume

9

Issue

1

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1038/s41467-018-05233-1

Socpus ID

85050990912 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85050990912

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