论文标题
通过光学诱导的电子筛选，铁电域壁的动态倾斜
Dynamic Tilting of Ferroelectric Domain Walls via Optically Induced Electronic Screening
论文作者
论文摘要
光学激发伴随着选择铁电薄膜内域壁倾斜方向的现象的平衡。高型载体BATIO3薄膜诱导的高载体密度通过BANDGAP超快的光脉冲改变了相对于基板 - 膜界面而形成90°A/C结构壁壁形成的倾斜角。变化的动力学在域扩散散射的时间分辨同步加速器X射线散射研究中显而易见。倾斜在298 K处发生，在该温度下，A/B和A/C结构域相共存，但在较好有序的单相A/C方向上不存在343 K。在298 K处的相共存会导致域壁电荷密度增加，因此比单相方面具有更大的筛选效果。筛选机制指向操纵纳米级铁电的新方向。
Optical excitation perturbs the balance of phenomena selecting the tilt orientation of domain walls within ferroelectric thin films. The high carrier density induced in a low-strain BaTiO3 thin film by an above-bandgap ultrafast optical pulse changes the tilt angle that 90° a/c domain walls form with respect to the substrate-film interface. The dynamics of the changes are apparent in time-resolved synchrotron x-ray scattering studies of the domain diffuse scattering. Tilting occurs at 298 K, a temperature at which the a/b and a/c domain phases coexist but is absent at 343 K in the better ordered single-phase a/c regime. Phase coexistence at 298 K leads to increased domain-wall charge density, and thus a larger screening effect than in the single-phase regime. The screening mechanism points to new directions for the manipulation of nanoscale ferroelectricity.
