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.
| Original language | English |
|---|---|
| Article number | L111201 |
| Journal | Physical Review Materials |
| Volume | 9 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2025 |
Funding
M.N. acknowledges support from the Air Force Office of Scientific Research MURI (Grant No. FA9550-20-1-0322) and the US Department of Energy (DOE), Office of Science, Basic Energy Sciences Grant No. DE-SC0024304. Work performed by B.R.O. (crystal growth, bulk measurements) was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. D.G.M. acknowledges support from AFOSR MURI (Novel Light-Matter Interactions in Topologically Non-Trivial Weyl Semimetal Structures and Systems), Grant No. FA9550-20-1-0322. The work at Northeastern University was supported by the Air Force Office of Scientific Research under Award No. FA9550-20-1-0322, and it benefited from the computational resources of Northeastern University's Advanced Scientific Computation Center (ASCC) and the Discovery Cluster. The work at S. N. Bose National Centre for Basic Sciences (SNBNCBS) was supported by Prime Minister Early Career Research Grant (PM-ECRG) from Anusandhan National Research Foundation (ANRF), file number ANRF/ECRG/2024/003677/PMS, and also benefited from the PARAM-Rudra computational facility at SNBNCBS. We thank Makoto Hashimoto and Donghui Lu for the beamline assistance at SSRL end station 5-2. The use of Stanford Synchrotron Radiation Lightsource (SSRL) in SLAC National Accelerator Laboratory is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. This research used resources of the Advanced Light Source, a U.S. Department of Energy Office of Science User Facility, under Contract No. DE-AC02-05CH11231.