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Title: Polar superhelices in ferroelectric chiral nanosprings
Authors: Shimada, Takahiro  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-8404-5673 (unconfirmed)
Lich, Le Van
Nagano, Koyo
Wang, Jian-Shan
Wang, Jie
Kitamura, Takayuki  kyouindb  KAKEN_id
Author's alias: 嶋田, 隆広
Issue Date: 7-Oct-2016
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 6
Thesis number: 35199
Abstract: Topological objects of nontrivial spin or dipolar field textures, such as skyrmions, merons, and vortices, interacting with applied external fields in ferroic materials are of great scientific interest as an intriguing playground of unique physical phenomena and novel technological paradigms. The quest for new topological configurations of such swirling field textures has primarily been done for magnets with Dzyaloshinskii-Moriya interactions, while the absence of such intrinsic chiral interactions among electric dipoles left ferroelectrics aside in this quest. Here, we demonstrate that a helical polarization coiled into another helix, namely a polar superhelix, can be extrinsically stabilized in ferroelectric nanosprings. The interplay between dipolar interactions confined in the chiral geometry and the complex strain field of mixed bending and twisting induces the superhelical configuration of electric polarization. The geometrical structure of the polar superhelix gives rise to electric chiralities at two different length scales and the coexistence of three order parameters, i.e., polarization, toroidization, and hypertoroidization, both of which can be manipulated by homogeneous electric and/or mechanical fields. Our work therefore provides a new geometrical configuration of swirling dipolar fields, which offers the possibility of multiple order-parameters, and electromechanically controllable dipolar chiralities and associated electro-optical responses.
Rights: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/216974
DOI(Published Version): 10.1038/srep35199
PubMed ID: 27713540
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