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Quantum anomalous Hall (QAH) phases in magnetic topological insulators arecharacterized by the scattering-free chiral edge currents protected by theirnontrivial bulk band topology. To fully explore these intriguing phenomena andapplication of topological insulators, high temperature material realization ofQAH phases is crucial. In this paper, based on extensive first-principlesdensity functional theory calculations, we predict that perovskite bilayers(LaXO$_3$)$_{2}$ (X = Pd, Pt) imbedded in the (111)(LaXO$_3$)$_{2}$/(LaAlO$_3$)$_{10}$ superlattices are high Curie temperatureferromagnets that host both QAH and Dirac semimetal phases, depending on thebiaxial strain and onsite electron correlation. In particular, both thedirection (the sign of Chern number) and spin-polarization of the chiral edgecurrents are tunable by either onsite electron correlation or biaxial in-planestrain. Furthermore, the nontrivial band gap can be enhanced up to 92 meV inthe LaPdO$_3$ bilayer by the compressive in-plane strain, and can go up to aslarge as 242 meV when the Pd atoms are replaced by the heavier Pt atoms.Finally, the microscopic mechanisms of the ferromagnetic coupling and otherinteresting properties of the bilayers are uncovered by analyzing theirunderlying electronic band structures.

Strain and onsite-correlation tunable quantum anomalous Hall phases in ferromagnetic (111) LaXO$_3$ bilayers (X$=$Pd, Pt)