Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands
arXiv:2307.15828 · doi:10.1021/acs.nanolett.3c01961
Abstract
Systems with flat bands are ideal for studying strongly correlated electronic states and related phenomena. Among them, kagome-structured metals such as CoSn have been recognized as promising candidates due to the proximity between the flat bands and the Fermi level. A key next step will be to realize epitaxial kagome thin films with flat bands to enable tuning of the flat bands across the Fermi level via electrostatic gating or strain. Here we report the band structures of epitaxial CoSn thin films grown directly on insulating substrates. Flat bands are observed using synchrotron-based angle-resolved photoemission spectroscopy (ARPES). The band structure is consistent with density functional theory (DFT) calculations, and the transport properties are quantitatively explained by the band structure and semiclassical transport theory. Our work paves the way to realize flat band-induced phenomena through fine-tuning of flat bands in kagome materials.
arXiv comment30 pages, 12 figures
References in corpus (13)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Tuning superconductivity in twisted bilayer graphene
- Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
- Nearly-flat bands with nontrivial topology
- Topological insulator on the kagome lattice
- Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
- Topological flat bands in frustrated kagome lattice CoSn
- Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
- Topological states on the breathing kagome lattice
- Fantastic flat bands and where to find them: The CoSn-type compounds
- Electrically Tunable Flat Bands and Magnetism in Twisted Bilayer Graphene
- Tuning the flat bands of the kagome metal CoSn with Fe, In, or Ni doping
- Flat-Band Itinerant Antiferromagnetism in the Kagome Metal CoSn1-xInx