Experimental observation of node-line-like surface states in LaBi

Abstract

In a Dirac nodal line semimetal, the bulk conduction and valence bands touch at extended lines in the Brillouin zone. To date, most of the theoretically predicted and experimentally discovered nodal lines derive from the bulk bands of two- and three-dimensional materials. Here, based on combined angle-resolved photoemission spectroscopy measurements and first-principles calculations, we report the discovery of node-line-like surface states on the (001) surface of LaBi. These bands derive from the topological surface states of LaBi and bridge the band gap opened by spin-orbit coupling and band inversion. Our first-principles calculations reveal that these "nodal lines" have a tiny gap, which is beyond typical experimental resolution. These results may provide important information to understand the extraordinary physical properties of LaBi, such as the extremely large magnetoresistance and resistivity plateau.

6 pages, 4 figures

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• Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
• Topological semimetals and topological insulators in rare earth monopnictides
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• Topological nodal lines and hybrid Weyl nodes in YCoC${}_2$
• Observation of gapped state in rare-earth monopnictide HoSb
• Complex electronic structure evolution of NdSb across the magnetic transition
• Behavior of gapped and ungapped Dirac cones in an antiferromagnetic topological metal, SmBi
• LaN Structural and Topological Transitions Driven by Temperature and Pressure
• Band engineering of a magnetic thin film rare earth monopnictide
• Structural, electronic and topological properties of 3D TmBi compound
• Temperature-dependent Fermi surface probed by Shubnikov-de Haas oscillations in topological semimetal candidates DyBi and HoBi
• Spin-orbital order and excitons in magnetoresistive HoBi