Electrically driven motion, destruction, and chirality change of polar vortices in oxide superlattices

作     者：Pan Chen Congbing Tan Zhexin Jiang Peng Gao Yuanwei Sun Lifen Wang Xiaomei Li Ruixue Zhu Lei Liao Xu Hou Ke Qu Ning Li Xiaomin Li Zhi Xu Kaihui Liu Wenlong Wang Jinbin Wang Xiaoping Ouyang Xiangli Zhong Jie Wang Xuedong Bai Pan Chen;Congbing Tan;Zhexin Jiang;Peng Gao;Yuanwei Sun;Lifen Wang;Xiaomei Li;Ruixue Zhu;Lei Liao;Xu Hou;Ke Qu;Ning Li;Xiaomin Li;Zhi Xu;Kaihui Liu;Wenlong Wang;Jinbin Wang;Xiaoping Ouyang;Xiangli Zhong;Jie Wang;Xuedong Bai

作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China International Center for Quantum MaterialsElectron Microscopy LaboratorySchool of PhysicsPeking UniversityBeijing 100871China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor MaterialsSchool of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Collaborative Innovation Center of Quantum MatterBeijing 100871China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials LaboratoryDongguan 523808China State Key Laboratory for Artificial Microstructure&Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing 100871China School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2022年第65卷第3期

页      面：77-84页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0804[工学-仪器科学与技术] 0802[工学-机械工程] 0701[理学-数学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51991340,51991344,11974023,51672007,21773303,11875229,and 51872251) the Chinese Academy of Sciences(Grant Nos.XDB33030200,and ZDYZ2015-1) the National Key R&D Program of China(Grant No.2016YFA0300804) the Key R&D Program of Guangdong Province(Grant Nos.2018B030327001,2018B010109009,and2019B010931001) the Bureau of Industry and Information Technology of Shenzhen(Grant No.201901161512) the Beijing Excellent Talents Training Support(Grant No.2017000026833ZK11) the“2011 Program”Peking-Tsinghua-IOP Collaborative Innovation Center for Quantum Matter。 

主　　题：chirality polar vortex ferroelectrics in situ transmission electron microscopy phase-field simulations 

摘      要：Topological polar vortices, which are electric analogs of magnetic objects, present great potential in applications of future nanoelectronics because of their nanometer size, anomalous dielectric response, and chirality. To enable the functionalities, it is prerequisite to manipulate the polar states and chirality by using external stimuli. Here, we probe the evolutions of polar state and chirality evolutions of topological polar vortices in Pb TiO;/Sr TiO;superlattices under an electric field by using atomically resolved in situ scanning transmission electron microscopy and phase-field simulations. We find that, under electric field, the chiral vortex cores can be moved laterally to form close-pair structures, transform into a/c domain stripes, and finally become a nonchiral c-domain. Such transition is reversible and spontaneous after bias removal. Interestingly, during switching and backswitching events, the vortex rotation can be changed, offering a potential strategy to manipulate vortex chirality. The revealed dynamic behavior of individual polar vortices at the atomic scale provides fundamentals for future device applications.