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Periodic splay Fréedericksz transitions in a ferroelectric nematic

Author

Listed:
  • Bijaya Basnet

    (Kent State University
    Kent State University)

  • Sathyanarayana Paladugu

    (Kent State University)

  • Oleksandr Kurochkin

    (National Academy of Sciences of Ukraine
    Polish Academy of Sciences)

  • Oleksandr Buluy

    (National Academy of Sciences of Ukraine)

  • Natalie Aryasova

    (National Academy of Sciences of Ukraine)

  • Vassili G. Nazarenko

    (National Academy of Sciences of Ukraine
    Polish Academy of Sciences)

  • Sergij V. Shiyanovskii

    (Kent State University
    Kent State University)

  • Oleg D. Lavrentovich

    (Kent State University
    Kent State University
    Kent State University)

Abstract

Electric field-induced splay of molecular orientation, called the Fréedericksz transition, is a fundamental electro-optic phenomenon in nonpolar nematic liquid crystals. In a ferroelectric nematic NF with a spontaneous electric polarization $${{\bf{P}}}$$ P , the splay is suppressed since it produces bound electric charges. Here, we demonstrate that an alternating current (ac) electric field causes three patterns of NF polarization. At low voltages, $${{\bf{P}}}$$ P oscillates around the field-free orientation with no stationary deformations. As the voltage increases, the polarization acquires stationary distortions, first splay and twist in a stripe pattern and then splay and bend in a square lattice of +1 and -1 defects. In all patterns, $${{\bf{P}}}$$ P oscillates around the stationary orientations. The stationary bound charge is reduced by a geometrical “splay cancellation” mechanism that does not require free ions: the charge created by splay in one plane is reduced by splay of an opposite sign in the orthogonal plane.

Suggested Citation

  • Bijaya Basnet & Sathyanarayana Paladugu & Oleksandr Kurochkin & Oleksandr Buluy & Natalie Aryasova & Vassili G. Nazarenko & Sergij V. Shiyanovskii & Oleg D. Lavrentovich, 2025. "Periodic splay Fréedericksz transitions in a ferroelectric nematic," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-55827-9
    DOI: 10.1038/s41467-025-55827-9
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    References listed on IDEAS

    as
    1. Priyanka Kumari & Bijaya Basnet & Hao Wang & Oleg D. Lavrentovich, 2023. "Ferroelectric nematic liquids with conics," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Bijaya Basnet & Mojtaba Rajabi & Hao Wang & Priyanka Kumari & Kamal Thapa & Sanjoy Paul & Maxim O. Lavrentovich & Oleg D. Lavrentovich, 2022. "Soliton walls paired by polar surface interactions in a ferroelectric nematic liquid crystal," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
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