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Title: Distinct multiple fermionic states in a single topological metal

Journal Article · · Nature Communications

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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)\
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1484667
Report Number(s):
LA-UR-18-28780
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (4)

Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe journal September 2018
Strong and Weak 3D Topological Insulators Probed by Surface Science Methods text January 2020
Strong and Weak 3D Topological Insulators Probed by Surface Science Methods journal May 2020
Observation of multiple Dirac states in a magnetic topological material EuMg2Bi2 preprint January 2019

Figures / Tables (5)


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