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.

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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 (11) (2020) Received: 13th, March 2020, revised: 11th, August 2020, accepted: 23rd, September 2020 Оригинал: Быстров В С, Фридкин В М «Двумерные сегнетоэлектрики и однородное переключение. К 75-летию теории сегнетоэлектричества Ландау—Гинзбурга» УФН 190 1217–1224 (2020); DOI: 10.3367/UFNr.2020.09.038841