Two-dimensional ferroelectric crystals

Within the framework of the Landau–Ginzburg theory, the kinetics of polarization switching of ferroelectric crystals and the transition from domain switching to homogeneous switching in nanoscale monocrystalline films are considered. It is shown that, within the framework of the chosen theory, homogeneous (domain-free) 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 calculations based on first principles.