取向工程是铁电体横向切换的通用策略
Orientation engineering is a universal strategy for ferroelectric trans-switching
- Luxembourg Institute of Science and Technology (LIST)（卢森堡科学与技术研究所）
- University of Luxembourg（卢森堡大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出取向工程作为调控铁电薄膜生长方向的通用策略，可实现极化横向切换和铁电体行为，为三维器件提供新可能。
AI中文摘要：
大约二十年前，“应变工程”作为调节外延薄膜的强大策略而出现。在此，我们认为“取向工程”——即控制薄膜的生长方向——构成了一种互补的设计路线，开辟了前所未有的机遇，值得更多关注。具体而言，我们表明取向工程可以赋予标准铁电化合物以奇特且有用的行为，这些行为可能难以或无法通过其他方式获得。至关重要的是，我们预测它能够轻松实现“横向切换”，即极化分量垂直于所施加电场方向切换，为新型三维器件架构铺平了道路。我们还表明，通过控制与薄膜接触的电极所提供的电屏蔽，可以获得铁电体行为。值得注意的是，人们甚至可以设计一种操作模式，其中切换实际上完全横向于所施加的电场。基于对代表性化合物LiNbO₃和BaTiO₃的现象学计算的支持，我们因此提出取向工程作为一种强大且通用的方法，以在普通铁电体中实现前所未有的功能。
英文摘要：
About two decades ago, ``strain engineering'' emerged as a powerful strategy to tune epitaxial thin films. Here we contend that ''orientation engineering'' - that is, controlling the film's growth direction - constitutes a complementary design route that opens unprecedented opportunities and deserves greater attention. Specifically, we show that orientation engineering can endow standard ferroelectric compounds with exotic and useful behaviors that may be difficult or impossible to obtain otherwise. Critically, we predict it readily enables ''trans-switching,'' where polarization components switch perpendicularly to the applied electric field, paving the way for novel 3D device architectures. We also show that, by controlling the electric screening provided by electrodes in contact with the film, ferrielectric behavior can be obtained. Notably, one can even design an operational mode where the switching is, in effect, fully transversal to the applied field. Supported by phenomenological calculations for representative compounds LiNbO$_3$ and BaTiO$_3$, we thus propose orientation engineering as a powerful and general method to unlock unprecedented functionalities in common ferroelectrics.
