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Multiple Dirac cones at the surface of the topological metal LaBi
Open accessAbstract
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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Metadata
- Authors
- Nayak, J., Wu, S.-C., Kumar, N., Shekhar, C., Singh, S., Fink, J., Rienks, E. E. D., Fecher, G. H., Parkin, S. S. P., Yan, B., & Felser, C.
- Venue
- Nature Communications
- Published
- 2017-01-09
- Volume
- 8
- Issue
- 1
- Pages
- 13942-13942
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2420913016
- Cited by
- 1,049
- References
- 31
- FWCI
- 65.95
- Type
- journal article
- Language
- en
- Open access
- gold
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- Nayak, J., Wu, S.-C., Kumar, N., Shekhar, C., Singh, S., Fink, J., Rienks, E. E. D., Fecher, G. H., Parkin, S. S. P., Yan, B., & Felser, C. (2017). Multiple Dirac cones at the surface of the topological metal LaBi. Nature Communications. https://doi.org/10.1038/ncomms13942
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