Emergence and transformation of polar skyrmion lattices via flexoelectricity  

作　　者：Jianhua Ren Linjie Liu Fei Sun Qian He Mengjun Wu Weijin Chen Yue Zheng 

机构地区：[1]Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices,School of Physics,Sun Yat-sen University,Guangzhou,510275,China [2]State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,Sun Yat-sen University,Guangzhou,510275,China [3]Centre for Physical Mechanics and Biophysics,School of Physics,Sun Yat-sen University,Guangzhou,510275,China [4]School of Materials,Sun Yat-sen University,Shenzhen,518107,China

出　　处：《npj Computational Materials》2024年第1期973-982,共10页计算材料学(英文)

基　　金：support by the Grants from National Natural Science Foundation of China(Nos.12222214,12132020,12302211);Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices(No.2022B1212010008);by the Shenzhen Science and Technology Program(Grant No.202206193000001,20220818181805001).

摘　　要：As analogies to magnetic skyrmions,polar skyrmions in ferroelectric superlattices and multilayers have garnered widespread attention for their non-trivial topology and novel properties like negative capacitance and nonlinear optical effect.So far,they have only been theoretically predicted to be able to assemble ordered hexagonal skyrmion lattices(SkLs)in ferroelectric thin films.Here,based on phase-field simulations,we report the critical roles of flexoelectricity playing in the stabilization and transformation of polar SkLs.Different polar SkL patterns can emerge in the ferroelectric thin films,including tetragonal-SkL,and hexagonal-SkLs with diverse orientations,as summarized by phase diagrams.These emergent SkL states are attributed to the material anisotropy modified by the flexoelectric effect.Interestingly,we further found that the hexagonal-SkLs can be rotated by applying strain gradient or in-plane electric field to the films.Moreover,a nonreciprocal bending response of tetragonal-SkL is also induced by the flexoelectric effect.Our results provide useful guidelines for the implementation of polar skyrmion lattices in experiments.

关 键 词：HEXAGONAL ferroelectric POLAR 

分 类 号：O41[理学—理论物理]