Observation of flat band, Dirac nodal lines and topological surface states in Kagome superconductor CsTi₃Bi₅.

ABSTRACT: Kagome lattices of various transition metals are versatile platforms for achieving anomalous Hall effects, unconventional charge-density wave orders and quantum spin liquid phenomena due to the strong correlations, spin-orbit coupling and/or magnetic interactions involved in such a lattice. Here, we use laser-based angle-resolved photoemission spectroscopy in combination with density functional theory calculations to investigate the electronic structure of the newly discovered kagome superconductor CsTi₃Bi₅, which is isostructural to the AV₃Sb₅ (A = K, Rb or Cs) kagome superconductor family and possesses a two-dimensional kagome network of titanium. We directly observe a striking flat band derived from the local destructive interference of Bloch

SUBMITTER: Yang J 

PROVIDER: S-EPMC10333313 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature