Evidence of topological insulator state in the semimetal LaBi

Abstract

By employing angle-resolved photoemission spectroscopy combined with first-principles calculations, we performed a systematic investigation on the electronic structure of LaBi, which exhibits extremely large magnetoresistance (XMR), and is theoretically predicted to possess band anticrossing with nontrivial topological properties. Here, the observations of the Fermi-surface topology and band dispersions are similar to previous studies on LaSb [Phys. Rev. Lett. 117, 127204 (2016)], a topologically trivial XMR semimetal, except the existence of a band inversion along the $\Gamma$-$X$ direction, with one massless and one gapped Dirac-like surface state at the $X$ and $\Gamma$ points, respectively. The odd number of massless Dirac cones suggests that LaBi is analogous to the time-reversal $Z_2$ nontrivial topological insulator. These findings open up a new series for exploring novel topological states and investigating their evolution from the perspective of topological phase transition within the family of rare-earth monopnictides.

arXiv comment6 pages, 4 figures

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• Experimental determination of the topological phase diagram in Cerium monopnictides
• Three-dimensional band structure of LaSb and CeSb:Absence of band inversion
• Magnetoresistance in YBi and LuBi semimetals due to nearly perfect carrier compensation
• Tunable Electronic Structure and Topological Properties of $LnPn$ ($Ln$=Ce, Pr, Gd, Sm, Yb; $Pn$=Sb, Bi)
• Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs
• Fermi surface topology and signature of surface Dirac nodes in LaBi
• Tunable Electronic Structure and Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell
• Pressure-induced topological phase transition in LaSb: First-principles study
• Unusual magnetotransport in holmium monoantimonide
• Observation of Open-Orbit Fermi Surface Topology in Extremely Large Magnetoresistance Semimetal MoAs${}_2$
• Extremely Large Magnetoresistance and Electronic Structure of TmSb
• Hybrid functional calculations of electronic structure and carrier densities in rare-earth monopnictides
• Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb
• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Experimental observation of node-line-like surface states in LaBi
• Interplay of Magnetism and Transport in HoBi
• Possible Experimental Realization of a Basic Z2 Topological Semimetal
• Observation of gapped state in rare-earth monopnictide HoSb
• Bulk band inversion and surface Dirac cones in LaSb and LaBi : Prediction of a new topological heterostructure
• Complex electronic structure evolution of NdSb across the magnetic transition
• Directional effects of antiferromagnetic ordering on the electronic structure in NdSb
• Trivial to nontrivial topology transition in rare-earth pnictides with epitaxial strain
• Behavior of gapped and ungapped Dirac cones in an antiferromagnetic topological metal, SmBi
• Antiferromagnetic topological insulator with selectively gapped Dirac cones
• First principles investigation of topological phase in XMR material TmSb under hydrostatic pressure
• LaN Structural and Topological Transitions Driven by Temperature and Pressure
• Band engineering of a magnetic thin film rare earth monopnictide
• Temperature-dependent Fermi surface probed by Shubnikov-de Haas oscillations in topological semimetal candidates DyBi and HoBi
• Unexpected changes in the band structure within AFM1 state of CeBi
• Chiral phonons in binary compounds $A$Bi ($A$ = K, Rb, Cs) with P2${}_1$/c structure
• Comparative study of the compensated semi-metals LaBi and LuBi : A first-principles approach
• SrPd, a candidate material with extremely large magnetoresistance
• First-principles study on the electron-phonon coupling and magnetoresistance of LaBi under pressure
• Direct evidence of electron-hole compensation for XMR in topologically trivial YBi
• Non-trivial topology in rare-earth monopnictides from dimensionality reduction
• Long-range magnetic order induced surface state in GdBi and DyBi
• Signatures of non-trivial band topology in LaAs/LaBi heterostructure
• Symmetry-enforced Fermi degeneracy in topological semimetal RhSb${}_3$
• Spin-orbital order and excitons in magnetoresistive HoBi
• Magnetization and magneto-transport measurements on CeBi single crystals