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Observation of multiple flat bands and Van Hove singularities in the distorted kagome metal NdTi3Bi4

Mazharul Islam Mondal1,*, Anup Pradhan Sakhya1,*, Milo Sprague1, Brenden R. Ortiz2, Matthew Matzelle3,4, Arun K. Kumay1, Avike Seal1, Barun Ghosh3,4,5, Arun Bansil3,4 et al.

Madhab Neupane1,†

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

Phys. Rev. B 112, L121104 – Published 10 September, 2025

DOI: https://doi.org/10.1103/mhj5-ws5v

Abstract

Kagome materials have attracted enormous research interest recently owing to their diverse topological phases and manifestation of electronic correlation. Here, we present the electronic structure of a distorted ferromagnetic kagome metal, NdTi3Bi4, exhibiting a transition temperature of 9 K. Our investigation employs a combination of angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations. We discover the presence of two “flat” bands which are found to originate from the kagome structure formed by Ti atoms with a major contribution from Ti dxy and Ti dx2−y2 orbitals. We also observed multiple Van Hove singularities (VHSs) in its electronic structure, with one VHS lying near the Fermi level. The ARPES data reveal the existence of Dirac cone at the K¯ point, a finding which is corroborated by our DFT calculations. These findings present a detailed electronic structure capable of hosting correlation-driven phenomenon in this novel ferromagnetic kagome metal.

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