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  • Letter
  • Open Access

Magnetic coupled electronic landscape in bilayer-distorted titanium-based kagome metals

Yong Hu1,2,*,†, Congcong Le3,*, Long Chen4,5,*, Hanbin Deng6, Ying Zhou4,5, Nicholas C. Plumb2, Milan Radovic2, Ronny Thomale7,8, Andreas P. Schnyder9 et al.

Jia-Xin Yin6, Gang Wang4, Xianxin Wu10,‡, and Ming Shi2,11,12,13,§

  • *These authors contributed equally to this work.
  • †Contact author: yonghphysics@gmail.com
  • ‡Contact author: xxwu@itp.ac.cn
  • §Contact author: shi20001231@zju.edu.cn
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Phys. Rev. B 110, L121114 – Published 19 September, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.L121114

Abstract

Quantum materials whose atoms are arranged on a lattice of corner-sharing triangles, i.e., the kagome lattice, have recently emerged as a captivating platform for investigating exotic correlated and topological electronic phenomena. Here, we combine ultralow temperature angle-resolved photoemission spectroscopy (ARPES) with scanning tunneling microscopy and density functional theory calculations to reveal the fascinating electronic structure of the bilayer-distorted kagome material LnTi3Bi4, where Ln stands for Nd and Yb. Distinct from other kagome materials, LnTi3Bi4 exhibits twofold, rather than sixfold, symmetries, stemming from the distorted kagome lattice, which leads to a unique electronic structure. Combining experiment and theory we map out the electronic structure and discover double flat bands as well as multiple Van Hove singularities (VHSs), with one VHS exhibiting higher-order characteristics near the Fermi level. Notably, in the magnetic version NdTi3Bi4, the ultralow base temperature ARPES measurements unveil an unconventional band splitting in the band dispersions which is induced by the ferromagnetic ordering. These findings reveal the potential of bilayer-distorted kagome metals LnTi3Bi4 as a promising platform for exploring novel emergent phases of matter at the intersection of strong correlation and magnetism.

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Phys. Rev. B 110, L121114– Published 19 September, 2024
  • Received 8 January 2024
  • Revised 24 August 2024
  • Accepted 28 August 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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