Two-dimensional ferroelectrics and homogeneous switching. On the 75th anniversary of the Landau—Ginzburg theory of ferroelectricity
V.M. Fridkinb aInstitute of Mathematical Problems of Biology, Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Prof. Vitkevich str. 1, Pushchino, Moscow Region, 142290, Russian Federation bFederal Scientific Research Center "Crystallography and Photonics", Russian Academy of Sciences, Leninskii prosp 59, Moscow, 119333, Russian Federation
Within the framework of the Landau—Ginzburg (LG) theory, the kinetics of polarization switching in ferroelectric crystals and the transition from domain switching to homogeneous switching in nanosized single-crystal films are considered. It is shown that homogeneous (nondomain) switching can be described in LG theory terms only for two-dimensional ferroelectrics. A review of the experimental results for two-dimensional films of a ferroelectric polymer and barium titanate is given. For ultrathin polymer films, these results are also confirmed by first principles calculations.
Keywords: ferroelectricity, Landau—Ginzburg—Devonshire theory, domains, two-dimensional ferroelectrics, homogeneous switching PACS:77.55.−g, 77.80.Dj, 77.84.Cg (all) DOI:10.3367/UFNe.2020.09.038841 URL: https://ufn.ru/en/articles/2020/11/e/ Citation: Bystrov V S, Fridkin V M "Two-dimensional ferroelectrics and homogeneous switching. On the 75th anniversary of the Landau—Ginzburg theory of ferroelectricity" Phys. Usp.63 1140–1147 (2020)