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  Multiple Dirac cones at the surface of the topological metal LaBi

Nayak, J., Wu, S., Kumar, N., Shekhar, C., Singh, S., Fink, J., et al. (2017). Multiple Dirac cones at the surface of the topological metal LaBi. Nature Communications, 8: 13942. doi:10.1038/ncomms13942.

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https://doi.org/10.1038/ncomms13942 (Publisher version)
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 Creators:
Nayak, J.1, Author
Wu, S.1, Author
Kumar, N.1, Author
Shekhar, C.1, Author
Singh, S.1, Author
Fink, J.1, Author
Rienks, E. E. D.1, Author
Fecher, G. H.1, Author
Parkin, Stuart S. P.2, Author              
Yan, B.1, Author
Felser, C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              

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 Abstract: 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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 Dates: 2017-01-09
 Publication Status: Published online
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 Identifiers: BibTex Citekey: P13159
DOI: 10.1038/ncomms13942
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 8 Sequence Number: 13942 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723