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. By employing angle-resolved photoemission spectroscopy (ARPES) in conjunction with $abinitio$ calculations, 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 center of the Brillouin zone. 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 semi-metal, 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.

18 pages including the supplementary information, 4+4 figures

References in corpus (8)

• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Compensated semimetal LaSb with unsaturated magnetoresistance
• Magnetotransport of single crystalline YSb
• Topological semimetals and topological insulators in rare earth monopnictides
• Asymmetric mass acquisition in LaBi - a new topological semimetal candidate
• Observation of Dirac-Like Semi-Metallic Phase in NdSb
• A new form of (unexpected) Dirac fermions in the strongly-correlated cerium monopnictides

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