This article is cited in 5 papers

FROM THE HISTORY OF PHYSICS

Two-dimensional ferroelectrics and homogeneous switching. On the 75th anniversary of the Landau–Ginzburg theory of ferroelectricity

V. S. Bystrov^a, V. M. Fridkin<sup>b

a</sup> Institute of Mathematical Problems of Biology, Russian Academy of Sciences, branch of the Federal Research Center Keldysh Institute of Applied Mathematics of the Russian Academy of Sciences, Pushchino, Moscow region
^b Federal Scientific Research Center Crystallography and Photonics, Russian Academy of Sciences, Shubnikov Institute of Crystallography, Moscow

Abstract: 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

Received: March 13, 2020
Revised: August 11, 2020
Accepted: September 23, 2020

DOI: 10.3367/UFNr.2020.09.038841

 English version: Physics–Uspekhi, 2020, 63:11, 1140–1147

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