论文标题
扰动电位效应的方法
Perturbative approach to electrocaloric effects
论文作者
论文摘要
我们表明，电代理（EC）效应 - 例如，绝缘体在应用电偏置后所经历的温度变化 - 在外场中以泰勒级数表示时，可以直接解释。 Our formalism explains in a unified and simple way the most notable small-field effects reported the literature -- e.g., the so-called {\em normal} (increase of temperature under bias, as usually found in ferroelectrics) and {\em inverse} (decrease of temperature, as e.g. in antiferroelectrics) EC responses -- and clarifies their physical interpretation.我们还详细讨论了针对铁电原型pbtio $ _ {3} $的第二个原型模拟，明确评估了对理论的微妙预测，例如对EC响应的竞争贡献的发生。
We show that the electrocaloric (EC) effect -- e.g., the temperature change experienced by an insulator upon application of an electric bias -- lends itself to a straightforward interpretation when expressed as a Taylor series in the external field. Our formalism explains in a unified and simple way the most notable small-field effects reported the literature -- e.g., the so-called {\em normal} (increase of temperature under bias, as usually found in ferroelectrics) and {\em inverse} (decrease of temperature, as e.g. in antiferroelectrics) EC responses -- and clarifies their physical interpretation. We also discuss in detail second-principles simulations for prototype ferroelectric PbTiO$_{3}$, explicitly evaluating subtle predictions of the theory, such as the occurrence of competing contributions to the EC response.
