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Polar vortex hidden in twisted bilayers of paraelectric SrTiO3

Author

Listed:
  • Haozhi Sha

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

  • Yixuan Zhang

    (Advanced Research Institute of Multidisciplinary Science & School of Materials Science and Engineering, Beijing Institute of Technology)

  • Yunpeng Ma

    (Tsinghua University
    Tsinghua University)

  • Wei Li

    (Tsinghua University
    Tsinghua University)

  • Wenfeng Yang

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

  • Jizhe Cui

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

  • Qian Li

    (Tsinghua University
    Tsinghua University)

  • Houbing Huang

    (Advanced Research Institute of Multidisciplinary Science & School of Materials Science and Engineering, Beijing Institute of Technology)

  • Rong Yu

    (Tsinghua University
    Tsinghua University
    Tsinghua University)

Abstract

Polar topologies, such as vortex and skyrmion, have attracted significant interest due to their unique physical properties and promising applications in high-density memory devices. To date, all known polar vortices are present in or induced by ferroelectric materials. In this study, we find polar vortex arrays in paraelectric SrTiO3. Using multislice electron ptychography, the evolution of vorticity along the vortex axis is revealed in twisted bilayers of SrTiO3 with deep-sub-angstrom resolution and one picometer accuracy. The surprising finding of polar vortices in a paraelectric crystal opens up opportunities for polarization physics and corresponding new devices.

Suggested Citation

  • Haozhi Sha & Yixuan Zhang & Yunpeng Ma & Wei Li & Wenfeng Yang & Jizhe Cui & Qian Li & Houbing Huang & Rong Yu, 2024. "Polar vortex hidden in twisted bilayers of paraelectric SrTiO3," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-55328-1
    DOI: 10.1038/s41467-024-55328-1
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