A 2D ferroelectric vortex pattern in twisted BaTiO3 freestanding layers
成果类型：
Article
署名作者：
Sanchez-Santolino, G.; Rouco, V.; Puebla, S.; Aramberri, H.; Zamora, V.; Cabero, M.; Cuellar, F. A.; Munuera, C.; Mompean, F.; Garcia-Hernandez, M.; Castellanos-Gomez, A.; Iniguez, J.; Leon, C.; Santamaria, J.
署名单位：
Complutense University of Madrid; Consejo Superior de Investigaciones Cientificas (CSIC); Complutense University of Madrid; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM); Luxembourg Institute of Science & Technology; Complutense University of Madrid; University of Luxembourg
刊物名称：
Nature
ISSN/ISSBN：
0028-4314
DOI：
10.1038/s41586-023-06978-6
发表日期：
2024-02-15
页码：
529-+
关键词：
electric polarization
rotation
domains
摘要：
The wealth of complex polar topologies(1-10) recently found in nanoscale ferroelectrics results from a delicate balance between the intrinsic tendency of the materials to develop a homogeneous polarization and the electric and mechanical boundary conditions imposed on them. Ferroelectric-dielectric interfaces are model systems in which polarization curling originates from open circuit-like electric boundary conditions, to avoid the build-up of polarization charges through the formation of flux-closure(11-14) domains that evolve into vortex-like structures at the nanoscale(15-17) level. Although ferroelectricity is known to couple strongly with strain (both homogeneous(18) and inhomogeneous(19,20)), the effect of mechanical constraints(21) on thin-film nanoscale ferroelectrics has been comparatively less explored because of the relative paucity of strain patterns that can be implemented experimentally. Here we show that the stacking of freestanding ferroelectric perovskite layers with controlled twist angles provides an opportunity to tailor these topological nanostructures in a way determined by the lateral strain modulation associated with the twisting. Furthermore, we find that a peculiar pattern of polarization vortices and antivortices emerges from the flexoelectric coupling of polarization to strain gradients. This finding provides opportunities to create two-dimensional high-density vortex crystals that would enable us to explore previously unknown physical effects and functionalities.