Diverse electronic topography in a distorted kagome metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>LaTi</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Bi</mml:mi> <mml:mn>4</mml:mn> </mml:msu

Recent reports on a family of kagome metals of the form $Ln{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{4}$ ($Ln=\mathrm{Lanthanide}$) 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 ${\mathrm{LaTi}}_{3}{\mathrm{Bi}}_{4}$. 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 $Ln{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{4}$ ($Ln=$ lanthanide) family.

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Publication Details

Journal
Physical Review Materials
Published
2025-11-17
DOI
https://doi.org/10.1103/yxk5-jy5b
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
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Diverse electronic topography in a distorted kagome metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>LaTi</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Bi</mml:mi> <mml:mn>4</mml:mn> </mml:msu

Barun Ghosh, Mazharul Islam Mondal, Arun Bansil, David Mandrus et al.
Physical Review Materials
Topological Materials and Phenomena
article

Diverse electronic topography in a distorted kagome metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>LaTi</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Bi</mml:mi> <mml:mn>4</mml:mn> </mml:msu

Barun Ghosh, Mazharul Islam Mondal, Arun Bansil, David Mandrus, Anup Pradhan Sakhya, Jonathan D. Denlinger, Matthew Matzelle, Milo Sprague, Madhab Neupane, Brenden R. Ortiz, Nabil Atlam, Arun K. Kumay
article en

Abstract

Recent reports on a family of kagome metals of the form $Ln{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{4}$ ($Ln=\mathrm{Lanthanide}$) 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 ${\mathrm{LaTi}}_{3}{\mathrm{Bi}}_{4}$. 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 $Ln{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{4}$ ($Ln=$ lanthanide) family.

Physical Review MaterialsVol. 9(11)
University of Central Florida (US), Oak Ridge National Laboratory (US), Lawrence Berkeley National Laboratory (US), University of Tennessee at Knoxville (US), S.N. Bose National Centre for Basic Sciences (IN), Universidad del Noreste (MX)
Openalex Percentile: Top 76%
Topological Materials and Phenomena
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