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Diverse electronic topography in a distorted kagome metal LaTi3Bi4

Anup Pradhan Sakhya1,*, Brenden R. Ortiz2,*, Nabil Atlam3,4,*, Matthew Matzelle3,4,*, Barun Ghosh3,4,5, Milo Sprague1, Mazharul Islam Mondal1, Iftakhar Bin Elius1, Nathan Valadez1 et al.

Arun K. Kumay1, David G. Mandrus6,7,8, Jonathan D. Denlinger9, Arun Bansil3,4, and Madhab Neupane1,†

  • *These authors contributed equally to this work.
  • †Contact author: madhab.neupane@ucf.edu

Phys. Rev. Materials 9, L111201 – Published 17 November, 2025

DOI: https://doi.org/10.1103/yxk5-jy5b

Abstract

Recent reports on a family of kagome metals of the form LnTi3Bi4 (Ln=Lanthanide) have stoked interest due to the combination of highly anisotropic magnetism and a rich electronic structure. The electronic structure near the Fermi level is proposed to exhibit Dirac points and van Hove singularities (VHSs). In this manuscript, we use angle-resolved photoemission spectroscopy measurements in combination with density functional theory calculations to investigate the electronic structure of an interesting kagome metal LaTi3Bi4. Our results reveal multiple VHSs with one VHS located in the vicinity of the Fermi level. We clearly observe two flat bands, which originate from the destructive interference of wave functions within the Ti kagome motif. These flat bands and VHSs originate from Ti d orbitals and are very responsive to the polarization of the incident beam. We notice a significant anisotropy in the electronic structure, resulting from the breaking of sixfold rotational symmetry in this material. Our findings demonstrate this member of Ti based kagome materials as a promising platform to explore novel emerging phenomena in the wider LnTi3Bi4 (Ln= lanthanide) family.

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