title: Multiple Dirac cones at the surface of the topological metal LaBi.
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.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Jayita
authors.initials: J
authors.lastname: Nayak
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Shu-Chun
authors.initials: SC
authors.lastname: Wu
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Nitesh
authors.initials: N
authors.lastname: Kumar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Chandra
authors.initials: C
authors.lastname: Shekhar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Singh
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.|Leibniz Institut für Festkörper- und Werkstoffforschung IFW Dresden, D-01171 Dresden, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Fink
authors.affiliation: Leibniz Institut für Festkörper- und Werkstoffforschung IFW Dresden, D-01171 Dresden, Germany.|Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16, 01062 Dresden, Germany.
authors.forename: Emile E D
authors.initials: EE
authors.lastname: Rienks
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Gerhard H
authors.initials: GH
authors.lastname: Fecher
authors.affiliation: Max Planck Institute for Microstructure Physics, Weinberg 2, D-01620 Halle (Saale), Germany.
authors.forename: Stuart S P
authors.initials: SS
authors.lastname: Parkin
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.|Max Planck Institute for Physics of Complex Systems, Nöthnitzer Str. 38, D-01187 Dresden, Germany.
authors.forename: Binghai
authors.identifier: 0000-0003-2164-5839
authors.initials: B
authors.lastname: Yan
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser