论文标题
3D曲率对非上域壁极化方向的影响
Impact of 3D curvature on the polarization orientation in non-Ising domain walls
论文作者
论文摘要
铁电域边界是准二维功能界面，具有纳米电子应用的前景高。尽管尺寸降低，但它们仍可以表现出复杂的非变化极化构型和意外的物理特性。在这里，使用第二谐波生成显微镜和3D极化分析研究了三维（3D）曲率对linbo3名义上未充电180°结构壁的极化曲线的影响。域壁曲率与其内部极化的变化之间的相关性以类似Néel的特征的调制形式展开，我们将其归因于柔韧性效应。虽然类似Néel的角色主要来自域壁的倾斜，但内部极化会由于偶极和单极结合电荷的协同升高以及与3D曲率变化而调整其方向。我们的结果表明，固体晶体中的弯曲接口可能为调整纳米级极状态提供丰富的操场。
Ferroelectric domain boundaries are quasi-two-dimensional functional interfaces with high prospects for nanoelectronic applications. Despite their reduced dimensionality, they can exhibit complex non-Ising polarization configurations and unexpected physical properties. Here, the impact of the three-dimensional (3D) curvature on the polarization profile of nominally uncharged 180° domain walls in LiNbO3 is studied using second-harmonic generation microscopy and 3D polarimetry analysis. Correlations between the domain wall curvature and the variation of its internal polarization unfold in the form of modulations of the Néel-like character, which we attribute to the flexoelectric effect. While the Néel-like character originates mainly from the tilting of the domain wall, the internal polarization adjusts its orientation due to the synergetic upshot of dipolar and monopolar bound charges and their variation with the 3D curvature. Our results show that curved interfaces in solid crystals may offer a rich playground for tailoring nanoscale polar states.
