Distinct multiple fermionic states in a single topological metal
Among the quantum materials that have recently gained interest are the topological insulators, wherein symmetryprotected surface states cross in reciprocal space, and the Dirac nodalline semimetals, where bulk bands touch along a line in kspace. However, the existence of multiple fermion phases in a single material has not been verified yet. Using angleresolved photoemission spectroscopy (ARPES) and firstprinciples 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 firstprinciples calculations reveal a onedimensional Dirac crossing—the surface Diracnode arc—along a highsymmetry 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 wellknown Fermi arcs in semimetals.
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 Univ. of Central Florida, Orlando, FL (United States)
 Uppsala Univ. (Sweden)
 National Taiwan Univ., Taipei (Taiwan)
 Polish Academy of Sciences (PAS), Wroclaw (Poland)
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Report Number(s):
 LAUR1828780
Journal ID: ISSN 20411723
 Grant/Contract Number:
 89233218CNA000001
 Type:
 Accepted Manuscript
 Journal Name:
 Nature Communications
 Additional Journal Information:
 Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 20411723
 Publisher:
 Nature Publishing Group
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)\
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
 OSTI Identifier:
 1484667
Hosen, M. Mofazzel, Dimitri, Klauss, Nandy, Ashis K., Aperis, Alex, Sankar, Raman, Dhakal, Gyanendra, Maldonado, Pablo, Kabir, Firoza, Sims, Christopher, Chou, Fangcheng, Kaczorowski, Dariusz, Durakiewicz, Tomasz, Oppeneer, Peter M., and Neupane, Madhab. Distinct multiple fermionic states in a single topological metal. United States: N. p.,
Web. doi:10.1038/s41467018052331.
Hosen, M. Mofazzel, Dimitri, Klauss, Nandy, Ashis K., Aperis, Alex, Sankar, Raman, Dhakal, Gyanendra, Maldonado, Pablo, Kabir, Firoza, Sims, Christopher, Chou, Fangcheng, Kaczorowski, Dariusz, Durakiewicz, Tomasz, Oppeneer, Peter M., & Neupane, Madhab. Distinct multiple fermionic states in a single topological metal. United States. doi:10.1038/s41467018052331.
Hosen, M. Mofazzel, Dimitri, Klauss, Nandy, Ashis K., Aperis, Alex, Sankar, Raman, Dhakal, Gyanendra, Maldonado, Pablo, Kabir, Firoza, Sims, Christopher, Chou, Fangcheng, Kaczorowski, Dariusz, Durakiewicz, Tomasz, Oppeneer, Peter M., and Neupane, Madhab. 2018.
"Distinct multiple fermionic states in a single topological metal". United States.
doi:10.1038/s41467018052331. https://www.osti.gov/servlets/purl/1484667.
@article{osti_1484667,
title = {Distinct multiple fermionic states in a single topological metal},
author = {Hosen, M. Mofazzel and Dimitri, Klauss and Nandy, Ashis K. and Aperis, Alex and Sankar, Raman and Dhakal, Gyanendra and Maldonado, Pablo and Kabir, Firoza and Sims, Christopher and Chou, Fangcheng and Kaczorowski, Dariusz and Durakiewicz, Tomasz and Oppeneer, Peter M. and Neupane, Madhab},
abstractNote = {Among the quantum materials that have recently gained interest are the topological insulators, wherein symmetryprotected surface states cross in reciprocal space, and the Dirac nodalline semimetals, where bulk bands touch along a line in kspace. However, the existence of multiple fermion phases in a single material has not been verified yet. Using angleresolved photoemission spectroscopy (ARPES) and firstprinciples 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 firstprinciples calculations reveal a onedimensional Dirac crossing—the surface Diracnode arc—along a highsymmetry 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 wellknown Fermi arcs in semimetals.},
doi = {10.1038/s41467018052331},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {8}
}
Works referenced in this record:
Generalized Gradient Approximation Made Simple
journal, October 1996
journal, October 1996
 Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
 Physical Review Letters, Vol. 77, Issue 18, p. 38653868
Projector augmentedwave method
journal, December 1994
journal, December 1994
 Bl�chl, P. E.
 Physical Review B, Vol. 50, Issue 24, p. 1795317979
Efficiency of abinitio total energy calculations for metals and semiconductors using a planewave basis set
journal, July 1996
journal, July 1996
 Kresse, G.; Furthm�ller, J.
 Computational Materials Science, Vol. 6, Issue 1, p. 1550
Colloquium: Topological insulators
journal, November 2010
journal, November 2010
 Hasan, M. Z.; Kane, C. L.
 Reviews of Modern Physics, Vol. 82, Issue 4, p. 30453067
Efficient iterative schemes for ab initio totalenergy calculations using a planewave basis set
journal, October 1996
journal, October 1996
 Kresse, G.; Furthm�ller, J.
 Physical Review B, Vol. 54, Issue 16, p. 1116911186
From ultrasoft pseudopotentials to the projector augmentedwave method
journal, January 1999
journal, January 1999
 Kresse, G.; Joubert, D.
 Physical Review B, Vol. 59, Issue 3, p. 17581775
Observation of a largegap topologicalinsulator class with a single Dirac cone on the surface
journal, May 2009
journal, May 2009
 Xia, Y.; Qian, D.; Hsieh, D.
 Nature Physics, Vol. 5, Issue 6, p. 398402