Engineering ferroelectric topologies in freestanding membranes

这一DECRA方案的重点是利用自支撑铁电超晶格中的受控运动、湮灭和创造真实空间的拓扑缺陷(极天子、旋涡和梅子)。铁性材料中的拓扑态是由自旋/偶极织构(自旋/偶极子可视为准粒子)凝聚而成的拓扑缺陷。通过在膜上施加弯曲应力、温度分布和电场，施加精确控制的弹性边界条件，可以实现量身定制的功能响应，而不会受到基板夹持效应的任何干扰。这产生了多功能材料，具有更高的运行速度、灵敏度和能效。

This DECRA proposal is focused on the exploiting controlled motion, annihilation and creation of real space topological defects (polar skyrmions, vortices and merons) in free-standing ferroelectric superlattices. Topological states in ferroic materials arise from spin/dipolar textures (the spins/dipoles can be considered as quasiparticles) which condense to form topological defects. The imposition of precisely controlled elastic boundary conditions through an applied bending stress, temperature profiles and electric fields to the membranes enables tailored functional responses without any interference from substrate clamping effect. This yields multifunctional materials with enhanced operational speed, sensitivity and energy-efficiencies.