气候变化领域集成服务门户(CCPortal): Emergent chirality in the electric polarization texture of titanate superlattices

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DOI	10.1073/pnas.1711652115
	Emergent chirality in the electric polarization texture of titanate superlattices
	Shafer P.; García-Fernández P.; Aguado-Puente P.; Damodaran A.R.; Yadav A.K.; Nelson C.T.; Hsu S.-L.; Wojdeł J.C.; Iñiguez J.; Martin L.W.; Arenholz E.; Junquera J.; Ramesh R.
发表日期	2018
ISSN	0027-8424
起始页码	915
结束页码	920
卷号	115 期号:5
英文摘要	Chirality is a geometrical property by which an object is not super-imposable onto its mirror image, thereby imparting a handedness. Chirality determines many important properties in nature—from the strength of the weak interactions according to the electroweak theory in particle physics to the binding of enzymes with naturally occurring amino acids or sugars, reactions that are fundamental for life. In condensed matter physics, the prediction of topologically protected magnetic skyrmions and related spin textures in chiral magnets has stimulated significant research. If the magnetic dipoles were replaced by their electrical counterparts, then electrically controllable chiral devices could be designed. Complex oxide BaTiO3/SrTiO3 nanocomposites and PbTiO3/SrTiO3 superlattices are perfect candidates, since “polar vortices,” in which a continuous rotation of ferroelectric polarization spontaneously forms, have been recently discovered. Using resonant soft X-ray diffraction, we report the observation of a strong circular dichroism from the interaction between circularly polarized light and the chiral electric polarization texture that emerges in PbTiO3/SrTiO3 superlattices. This hallmark of chirality is explained by a helical rotation of electric polarization that second-principles simulations predict to reside within complex 3D polarization textures comprising ordered topological line defects. The handedness of the texture can be topologically characterized by the sign of the helicity number of the chiral line defects. This coupling between the optical and novel polar properties could be exploited to encode chiral signatures into photon or electron beams for information processing.
英文关键词	Chirality; Electric polarization; Resonant soft X-ray diffraction; Second-principles calculations; Topological textures
语种	英语
scopus关键词	lead titanate; strontium titanate; titanium; unclassified drug; Article; chirality; circular dichroism; electron beam; photon; polarization; priority journal; rotation; X ray diffraction
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/160547
作者单位	Shafer, P., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; García-Fernández, P., Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Santander, 39005, Spain; Aguado-Puente, P., Centro de Física de Materiales, Universidad del País Vasco, San Sebastián, 20018, Spain, Atomistic Simulation Center, Queen’s University Belfast, Belfast, BT7-1NN, United Kingdom; Damodaran, A.R., Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States; Yadav, A.K., Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, United States; Nelson, C.T., Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States, National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Hsu, S.-L., Department of Materials Science and Engineering, ...
推荐引用方式 GB/T 7714	Shafer P.,García-Fernández P.,Aguado-Puente P.,et al. Emergent chirality in the electric polarization texture of titanate superlattices[J],2018,115(5).
APA	Shafer P..,García-Fernández P..,Aguado-Puente P..,Damodaran A.R..,Yadav A.K..,...&Ramesh R..(2018).Emergent chirality in the electric polarization texture of titanate superlattices.Proceedings of the National Academy of Sciences of the United States of America,115(5).
MLA	Shafer P.,et al."Emergent chirality in the electric polarization texture of titanate superlattices".Proceedings of the National Academy of Sciences of the United States of America 115.5(2018).