Two-Dimensional Ferroelectric Crystals

The polarization switching kinetics of ferroelectric crystals and the transition from the domain to uniform switching in single-crystal nanofilms have been considered within the Landau–Ginzburg theory. It is shown that, within the chosen theory, the uniform (domainless) switching can be described only for two-dimensional ferroelectrics. Experimental results for two-dimensional films of ferroelectric polymer and barium titanate are presented. For ultrathin polymer films, these results are also confirmed by ab initio calculations.