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.

中文翻译：

---

二维铁电体和均匀开关。朗道-金茨堡铁电理论问世 75 周年

在 Landau-Ginzburg (LG) 理论的框架内，考虑了铁电晶体中极化转换的动力学以及纳米单晶薄膜中从畴转换到均匀转换的转变。结果表明，均质（非域）切换只能用 LG 理论术语来描述二维铁电体。综述了铁电聚合物和钛酸钡二维薄膜的实验结果。对于超薄聚合物薄膜，这些结果也通过第一性原理计算得到证实。