Journal article
Multiple Dirac cones at the surface of the topological metal LaBi
Nature Communications, Vol.8, 13942
Jan/2017
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.
Details
- Title
- Multiple Dirac cones at the surface of the topological metal LaBi
- Creators
- Jayita Nayak (null)Shu-Chun Wu (null)Nitesh Kumar (null)Chandra Shekhar (null)Sanjay Singh (null)Joerg Fink (null)Emile E. D. Rienks (null)Gerhard H. Fecher (null)Stuart S. P. Parkin (null)Binghai Yan (null) - The Weizmann Institute of ScienceClaudia Felser (null)
- Resource Type
- Journal article
- Publication Details
- Nature Communications, Vol.8, 13942; Jan/2017
- Number of pages
- 5
- Language
- English
- DOI
- https://doi.org/10.1038/ncomms13942
- Grant note
- ERC [291472]_ALMAME_DELIMITER_
- Scientific Unit
- The Weizmann Institute of Science
- Record Identifier
- 993266131503596
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