Periodic splay Fréedericksz transitions in a ferroelectric nematic
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929627963850752 |
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| author | Basnet, Bijaya Paladugu, Sathyanarayana Kurochkin, Oleksandr Buluy, Oleksandr Aryasova, Natalie Nazarenko, Vassili G. Shiyanovskii, Sergij V. Lavrentovich, Oleg D. |
| author_facet | Basnet, Bijaya Paladugu, Sathyanarayana Kurochkin, Oleksandr Buluy, Oleksandr Aryasova, Natalie Nazarenko, Vassili G. Shiyanovskii, Sergij V. Lavrentovich, Oleg D. |
| contents | 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 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, 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, 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_09553 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Periodic splay Fréedericksz transitions in a ferroelectric nematic Basnet, Bijaya Paladugu, Sathyanarayana Kurochkin, Oleksandr Buluy, Oleksandr Aryasova, Natalie Nazarenko, Vassili G. Shiyanovskii, Sergij V. Lavrentovich, Oleg D. Soft Condensed Matter Materials Science 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 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, 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, 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. |
| title | Periodic splay Fréedericksz transitions in a ferroelectric nematic |
| topic | Soft Condensed Matter Materials Science |
| url | https://arxiv.org/abs/2412.09553 |