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Multiple Dirac cones at the surface of the topological metal LaBi

The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties, including an extremely large and anisotropic magnetoresistance. Experimental evidence for topological surface states is still missing although band inversions have been postulated to induce a topological phase in LaBi. In...

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Autores principales: Nayak, Jayita, Wu, Shu-Chun, Kumar, Nitesh, Shekhar, Chandra, Singh, Sanjay, Fink, Jörg, Rienks, Emile E. D., Fecher, Gerhard H., Parkin, Stuart S. P., Yan, Binghai, Felser, Claudia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5227739/
https://www.ncbi.nlm.nih.gov/pubmed/28067241
http://dx.doi.org/10.1038/ncomms13942
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author Nayak, Jayita
Wu, Shu-Chun
Kumar, Nitesh
Shekhar, Chandra
Singh, Sanjay
Fink, Jörg
Rienks, Emile E. D.
Fecher, Gerhard H.
Parkin, Stuart S. P.
Yan, Binghai
Felser, Claudia
author_facet Nayak, Jayita
Wu, Shu-Chun
Kumar, Nitesh
Shekhar, Chandra
Singh, Sanjay
Fink, Jörg
Rienks, Emile E. D.
Fecher, Gerhard H.
Parkin, Stuart S. P.
Yan, Binghai
Felser, Claudia
author_sort Nayak, Jayita
collection PubMed
description The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties, including an extremely large and anisotropic magnetoresistance. Experimental evidence for topological surface states is still missing although band inversions have been postulated to induce a topological phase in LaBi. In this work, we have revealed the existence of surface states of LaBi through the observation of three Dirac cones: two coexist at the corners and one appears at the centre of the Brillouin zone, by employing angle-resolved photoemission spectroscopy in conjunction with ab initio calculations. The odd number of surface Dirac cones is a direct consequence of the odd number of band inversions in the bulk band structure, thereby proving that LaBi is a topological, compensated semimetal, which is equivalent to a time-reversal invariant topological insulator. Our findings provide insight into the topological surface states of LaBi's semi-metallicity and related magneto-transport properties.
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spelling pubmed-52277392017-02-01 Multiple Dirac cones at the surface of the topological metal LaBi Nayak, Jayita Wu, Shu-Chun Kumar, Nitesh Shekhar, Chandra Singh, Sanjay Fink, Jörg Rienks, Emile E. D. Fecher, Gerhard H. Parkin, Stuart S. P. Yan, Binghai Felser, Claudia Nat Commun Article The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties, including an extremely large and anisotropic magnetoresistance. Experimental evidence for topological surface states is still missing although band inversions have been postulated to induce a topological phase in LaBi. In this work, we have revealed the existence of surface states of LaBi through the observation of three Dirac cones: two coexist at the corners and one appears at the centre of the Brillouin zone, by employing angle-resolved photoemission spectroscopy in conjunction with ab initio calculations. The odd number of surface Dirac cones is a direct consequence of the odd number of band inversions in the bulk band structure, thereby proving that LaBi is a topological, compensated semimetal, which is equivalent to a time-reversal invariant topological insulator. Our findings provide insight into the topological surface states of LaBi's semi-metallicity and related magneto-transport properties. Nature Publishing Group 2017-01-09 /pmc/articles/PMC5227739/ /pubmed/28067241 http://dx.doi.org/10.1038/ncomms13942 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Nayak, Jayita
Wu, Shu-Chun
Kumar, Nitesh
Shekhar, Chandra
Singh, Sanjay
Fink, Jörg
Rienks, Emile E. D.
Fecher, Gerhard H.
Parkin, Stuart S. P.
Yan, Binghai
Felser, Claudia
Multiple Dirac cones at the surface of the topological metal LaBi
title Multiple Dirac cones at the surface of the topological metal LaBi
title_full Multiple Dirac cones at the surface of the topological metal LaBi
title_fullStr Multiple Dirac cones at the surface of the topological metal LaBi
title_full_unstemmed Multiple Dirac cones at the surface of the topological metal LaBi
title_short Multiple Dirac cones at the surface of the topological metal LaBi
title_sort multiple dirac cones at the surface of the topological metal labi
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5227739/
https://www.ncbi.nlm.nih.gov/pubmed/28067241
http://dx.doi.org/10.1038/ncomms13942
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