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Title

Emergent chirality in the electric polarization texture of titanate superlattices

AuthorsShafer, Padraic; García-Fernández, Pablo; Aguado-Puente, Pablo; Damodaran, Anoop R.; Yadav, Ajay K.; Nelson, Christopher T.; Hsu, Shang-Li; Wojdeł, Jacek C.; Íñiguez, Jorge ; Martin, Lane W.; Arenholz, Elke; Junquera, Javier; Ramesh, Ramamoorthy
KeywordsSecond-principles calculations
Topological textures
Electric polarization
Chirality
Resonant soft X-ray diffraction
Issue Date2018
PublisherNational Academy of Sciences (U.S.)
CitationProceedings of the National Academy of Sciences 115(5): 915-920 (2018)
AbstractChirality 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 BaTiO/SrTiO nanocomposites and PbTiO/SrTiO 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 PbTiO/SrTiO 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.
Publisher version (URL)https://doi.org/10.1073/pnas.1711652115
URIhttp://hdl.handle.net/10261/177962
Identifiersdoi: 10.1073/pnas.1711652115
e-issn: 1091-6490
issn: 0027-8424
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