Multiple Dirac cones at the surface of the topological metal LaBi

Jayita Nayak, Shu-Chun Wu, Nitesh Kumar, Chandra Shekhar, Sanjay Singh, Jörg Fink, Emile E. D. Rienks, Gerhard H. Fecher, Stuart S. P. Parkin, Binghai Yan () and Claudia Felser ()
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Jayita Nayak: Max Planck Institute for Chemical Physics of Solids
Shu-Chun Wu: Max Planck Institute for Chemical Physics of Solids
Nitesh Kumar: Max Planck Institute for Chemical Physics of Solids
Chandra Shekhar: Max Planck Institute for Chemical Physics of Solids
Sanjay Singh: Max Planck Institute for Chemical Physics of Solids
Jörg Fink: Max Planck Institute for Chemical Physics of Solids
Emile E. D. Rienks: Leibniz Institut für Festkörper- und Werkstoffforschung IFW Dresden
Gerhard H. Fecher: Max Planck Institute for Chemical Physics of Solids
Stuart S. P. Parkin: Max Planck Institute for Microstructure Physics
Binghai Yan: Max Planck Institute for Chemical Physics of Solids
Claudia Felser: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2017, vol. 8, issue 1, 1-5

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms13942

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