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Journal Article

Multiple Dirac cones at the surface of the topological metal LaBi


Parkin,  Stuart S. P.       
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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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.

Cite as: https://hdl.handle.net/21.11116/0000-0009-75D0-8
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.