Creating polar antivortex in PbTiO3/SrTiO3 superlattice

Adeel Y. Abid, Yuanwei Sun, Xu Hou, Congbing Tan, Xiangli Zhong (), Ruixue Zhu, Haoyun Chen, Ke Qu, Yuehui Li, Mei Wu, Jingmin Zhang, Jinbin Wang, Kaihui Liu, Xuedong Bai, Dapeng Yu, Xiaoping Ouyang, Jie Wang (), Jiangyu Li () and Peng Gao ()
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Adeel Y. Abid: Peking University
Yuanwei Sun: Peking University
Xu Hou: Zhejiang University
Congbing Tan: Xiangtan University
Xiangli Zhong: Xiangtan University
Ruixue Zhu: Peking University
Haoyun Chen: Zhejiang University
Ke Qu: Peking University
Yuehui Li: Peking University
Mei Wu: Peking University
Jingmin Zhang: Peking University
Jinbin Wang: Xiangtan University
Kaihui Liu: Collaborative Innovation Centre of Quantum Matter
Xuedong Bai: Chinese Academy of Sciences
Dapeng Yu: Collaborative Innovation Centre of Quantum Matter
Xiaoping Ouyang: Xiangtan University
Jie Wang: Zhejiang University
Jiangyu Li: Chinese Academy of Sciences
Peng Gao: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Nontrivial topological structures offer a rich playground in condensed matters and promise alternative device configurations for post-Moore electronics. While recently a number of polar topologies have been discovered in confined ferroelectric PbTiO3 within artificially engineered PbTiO3/SrTiO3 superlattices, little attention was paid to possible topological polar structures in SrTiO3. Here we successfully create previously unrealized polar antivortices within the SrTiO3 of PbTiO3/SrTiO3 superlattices, accomplished by carefully engineering their thicknesses guided by phase-field simulation. Field- and thermal-induced Kosterlitz–Thouless-like topological phase transitions have also been demonstrated, and it was discovered that the driving force for antivortex formation is electrostatic instead of elastic. This work completes an important missing link in polar topologies, expands the reaches of topological structures, and offers insight into searching and manipulating polar textures.

Date: 2021
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DOI: 10.1038/s41467-021-22356-0

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