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DOI	10.1073/pnas.2007248117
	Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure
	Li X.; Tan C.; Liu C.; Gao P.; p-gao@pku.edu.cn; Sun Y.; Chen P.; Li M.; Liao L.; Zhu R.; Wang J.; Zhao Y.; Wang L.; Xu Z.; Liu K.; Zhong X.; xlzhong@xtu.edu.cn; Wang J.; jw@zju.edu.cn; Bai X.; xdbai@iphy.ac.cn
发表日期	2020
ISSN	0027-8424
起始页码	18954
结束页码	18961
卷号	117 期号:32
英文摘要	The ability to controllably manipulate complex topological polar configurations such as polar flux-closures via external stimuli may allow the construction of new electromechanical and nanoelectronic devices. Here, using atomically resolved in situ scanning transmission electron microscopy, we find that the polar fluxclosures in PbTiO3/SrTiO3 superlattice films are mobile and can be reversibly switched to ordinary single ferroelectric c or a domains under an applied electric field or stress. Specifically, the electric field initially drives movement of a flux-closure via domain wall motion and then breaks it to form intermediate a/c striped domains, whereas mechanical stress first squeezes the core of a flux-closure toward the interface and then form a/c domains with disappearance of the core. After removal of the external stimulus, the flux-closure structure spontaneously recovers. These observations can be precisely reproduced by phase field simulations, which also reveal the evolutions of the competing energies during phase transitions. Such reversible switching between flux-closures and ordinary ferroelectric states provides a foundation for potential electromechanical and nanoelectronic applications. © 2020 National Academy of Sciences. All rights reserved.
语种	英语
scopus关键词	Article; controlled study; electric field; electrical parameters; mechanical stress; phase transition; polar flux closure; priority journal; scanning transmission electron microscopy
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160238
作者单位	Li, X., Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China, International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Tan, C., Department of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan, 411201, China, School ofMaterials Science and Engineering, Xiangtan University, Xiangtan, 411105, China; Liu, C., Department of Engineering Mechanics, Zhejiang University, Hangzhou, 310027, China; Gao, P., p-gao@pku.edu.cn, International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China, Collaborative Innovation Centre of Quantum Matter, Beijing, 100871, China, Electron Microscopy Laboratory, Peking University, Beijing, 100871, China; Sun, Y., International Center for Quantum Materials, School of Physics, Peking Universit...
推荐引用方式 GB/T 7714	Li X.,Tan C.,Liu C.,et al. Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure[J],2020,117(32).
APA	Li X..,Tan C..,Liu C..,Gao P..,p-gao@pku.edu.cn.,...&xdbai@iphy.ac.cn.(2020).Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure.Proceedings of the National Academy of Sciences of the United States of America,117(32).
MLA	Li X.,et al."Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure".Proceedings of the National Academy of Sciences of the United States of America 117.32(2020).