Multiple Dirac cones at the surface of the topological metal LaBi
Nayak J, Wu SC, Kumar N, Shekhar C, Singh S, Fink J, Rienks EED, Fecher GH, Parkin SSP, Yan B, Felser C (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 8
Article Number: 13942
DOI: 10.1038/ncomms13942
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.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics
Germany (DE)
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics
Germany (DE)
How to cite
APA:
Nayak, J., Wu, S.-C., Kumar, N., Shekhar, C., Singh, S., Fink, J.,... Felser, C. (2017). Multiple Dirac cones at the surface of the topological metal LaBi. Nature Communications, 8. https://doi.org/10.1038/ncomms13942
MLA:
Nayak, Jayita, et al. "Multiple Dirac cones at the surface of the topological metal LaBi." Nature Communications 8 (2017).
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