ARPES Investigation of the Electronic Structure in MBE-Grown Fe₃Sn₂ Kagome Lattice

In a two-dimensional (2D) Kagome lattice, ideal Kagome bands, including Dirac cones Van Hove Singularities (VHSs), and flat bands, are highly anticipated for their potential to explore novel physical phenomena. However, in existing Kagome materials, complex 3D and multi-order electron hoppings often modify or obscure these ideal bands. The Kagome ferromagnet Fe₃Sn₂, known to host massive Dirac fermions with a spin-orbit coupling-induced band gap, features dimerized adjacent Kagome layers with ABC stacking. While this material is predicted to exhibit double Dirac cones and a flat band, the flat band has not yet been experimentally realized, and the nature of the double Dirac cones remains unclear. In this study, we used state-of-the-art Angle-Resolved Photoemission Spectroscopy (ARPES) on Fe₃Sn₂ thin film grown via Molecular Beam Epitaxy (MBE) to investigate the impact of 3D electron hopping on the electronic structure, aiming to better understand the kagome bands behavior and possibility for spin reorientation induced band gap emergence.