Engineered Interfaces of Artificial Perovskite Oxide Super lattices via Nanosheet Deposition Process

Combining different materials into desired superlattice structures can,produce new electronic states at the interface and the opportunity to create artificial materials with novel properties. Here we introduce a new, rather unexpected, and yet simple way to such a superlattice assembly of perovskite oxides in the Dion - Jacobson phase, a model system of layered perovskites, high-quality bicolor perovskite superlattices (LaNb2O7)(nL)(Ca2Nb3O10)(nC) are successfully fabricated by a layer by layer assembly using two different perovskite nanosheets (LaNb2O7 and Ca2Nb3O10) as a building block. The artificially fabricated (LaNb2O7/Ca2Nb3O10) superlattices are structuraly unique. which is not feasible to create in the bulk form. By such an artificial structuring. We found that (LaNb2O7 and Ca2Nb3O10) superlattices possess a new form of interface coupling, which gives rise to ferroelectricity.