Asymmetric mass acquisition in LaBi - a new topological semimetal candidate

Abstract

We use our high resolution He-lamp based, tunable laser-based ARPES measurements and density functional theory calculations to study the electronic properties of LaBi, a binary system that was proposed to be a member of a new family of topological semimetals. Both bulk and surface bands are present in the spectra. The dispersion of the surface state is highly unusual. It resembles a Dirac cone, but upon closer inspection we can clearly detect an energy gap. The bottom band follows roughly a parabolic dispersion. The dispersion of the top band remains very linear, "V" shape like, with the tip approaching very closely to the extrapolated location of Dirac point. Such asymmetric mass acquisition is highly unusual and opens a possibility of a new topological phenomena that has yet to be understood.

14 pages 4 figures

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Cited by in corpus (36)

• Multiple Dirac cones at the surface of the topological metal LaBi
• Symmetry Demanded Topological Nodal-line Materials
• Presence of Exotic Electronic Surface States in LaBi and LaSb
• Evidence of topological insulator state in the semimetal LaBi
• 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
• Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet
• Large magnetoresistance in type-II Weyl semimetal WP${}_2$
• Electronic structure of RSb (R = Y, Ce, Gd, Dy, Ho, Tm, Lu) studied by angle-resolved photoemission spectroscopy
• Separation of Electron and Hole Dynamics in the Semimetal LaSb
• Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs
• Fermi surface topology and signature of surface Dirac nodes in LaBi
• Tuning the electronic and the crystalline structure of LaBi by pressure
• Tunable Electronic Structure and Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell
• Unusual magnetotransport in holmium monoantimonide
• Extremely Large Magnetoresistance and Electronic Structure of TmSb
• 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
• First-Principles Study of Strain Effect on Thermoelectric Properties of LaP and LaAs
• Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb
• Observation of gapped state in rare-earth monopnictide HoSb
• Complex electronic structure evolution of NdSb across the magnetic transition
• Directional effects of antiferromagnetic ordering on the electronic structure in NdSb
• Evidence of non-trivial Berry phase and Kondo physics in SmBi
• Magnetic field induced strong valley polarization in the three dimensional topological semimetal LaBi
• Antiferromagnetic topological insulator with selectively gapped Dirac cones
• Behavior of gapped and ungapped Dirac cones in an antiferromagnetic topological metal, SmBi
• LaN Structural and Topological Transitions Driven by Temperature and Pressure
• Unconventional Surface State Pairs in a High-Symmetry Lattice with Anti-ferromagnetic Band-folding
• Unexpected changes in the band structure within AFM1 state of CeBi
• First-principles study on the electron-phonon coupling and magnetoresistance of LaBi under pressure
• Comparative study of the compensated semi-metals LaBi and LuBi : A first-principles approach
• Non-trivial topology in rare-earth monopnictides from dimensionality reduction
• Symmetry-enforced Fermi degeneracy in topological semimetal RhSb${}_3$
• Ultrasonic investigation of the Kondo semimetal CeBi