globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1711652115
论文题名:
Emergent chirality in the electric polarization texture of titanate superlattices
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:5
起始页码: 915
结束页码: 920
语种: 英语
英文关键词: Chirality ; Electric polarization ; Resonant soft X-ray diffraction ; Second-principles calculations ; Topological textures
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163745
Appears in Collections:气候变化与战略

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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, University of California, Berkeley, CA 94720, United States, National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Wojdeł, J.C., Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Científicas, Bellaterra, E-08193, Spain; Iñiguez, J., Materials Research and Technology Department, Luxembourg Institute of Science and Technology, Esch/Alzette, L-4362, Luxembourg; Martin, L.W., Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Arenholz, E., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States, Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States; Junquera, J., Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Santander, 39005, Spain; Ramesh, R., Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States, Energy Technologies, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States

Recommended Citation:
Shafer P.,García-Fernández P.,Aguado-Puente P.,et al. Emergent chirality in the electric polarization texture of titanate superlattices[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(5)
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