High Chern numbers in a perovskite-derived dice lattice (LaXO₃)₃/(LaAlO₃)₃(111) with X = Ti, Mn and Co.

ABSTRACT: The dice lattice, containing a stack of three triangular lattices, has been proposed to exhibit nontrivial flat bands with nonzero Chern numbers, but unlike the honeycomb lattice it is much less studied. By employing density-functional theory (DFT) calculations with an on-site Coulomb repulsion term, we explore systematically the electronic and topological properties of (LaXO₃)₃/(LaAlO₃)₃(111) superlattices with X = Ti, Mn and Co, where a LaAlO₃ trilayer spacer confines the LaXO₃ (LXO) dice lattice. In the absence of spin-orbit coupling (SOC) with symmetry constrained to P3, the ferromagnetic (FM) phase of the LXO(111) trilayers exhibits a half-metallic band structure with multiple Dirac crossings and coupled electron-hole p

SUBMITTER: Koksal O 

PROVIDER: S-EPMC10313702 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature