Landau theory applied to antiferroelectric ordering in ferroelectric nematic liquid crystals
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916003637624832 |
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| author | Badu, Manisha Ghimire, Arjun Milon Kumari, Priyanka Bisoyi, Hari Krishna Lavrentovich, Oleg D. Gleeson, James Jakli, Antal Sprunt, Samuel |
| author_facet | Badu, Manisha Ghimire, Arjun Milon Kumari, Priyanka Bisoyi, Hari Krishna Lavrentovich, Oleg D. Gleeson, James Jakli, Antal Sprunt, Samuel |
| contents | The polarization and density modulation associated with antiferroelectric ordering is studied experimentally as a function of temperature in two ferroelectric nematic liquid crystals, the prototypical single compound (DIO) and a commercial mixture (FNLC919). The modulation wavenumber qA is determined by small angle X-ray diffraction from the weak smectic-like density wave (wavenumber qS = 2qA) that accompanies the polarization modulation. Results for qS and the saturated value of the polarization are analyzed in terms of Landau theory previously developed to describe the para-/antiferro-/feroelectric sequence of phase transitions in solid ferroelectrics. The analysis indicates that the polarization modulation is reasonably well approximated by a simple sinusoid in the antiferroelectric phase of DIO, whereas in FNLC919 the modulation develops a strongly soliton-like profile (with sharply decreasing wavenumber) close to the antiferro- to ferrolectric transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_11413 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Landau theory applied to antiferroelectric ordering in ferroelectric nematic liquid crystals Badu, Manisha Ghimire, Arjun Milon Kumari, Priyanka Bisoyi, Hari Krishna Lavrentovich, Oleg D. Gleeson, James Jakli, Antal Sprunt, Samuel Soft Condensed Matter The polarization and density modulation associated with antiferroelectric ordering is studied experimentally as a function of temperature in two ferroelectric nematic liquid crystals, the prototypical single compound (DIO) and a commercial mixture (FNLC919). The modulation wavenumber qA is determined by small angle X-ray diffraction from the weak smectic-like density wave (wavenumber qS = 2qA) that accompanies the polarization modulation. Results for qS and the saturated value of the polarization are analyzed in terms of Landau theory previously developed to describe the para-/antiferro-/feroelectric sequence of phase transitions in solid ferroelectrics. The analysis indicates that the polarization modulation is reasonably well approximated by a simple sinusoid in the antiferroelectric phase of DIO, whereas in FNLC919 the modulation develops a strongly soliton-like profile (with sharply decreasing wavenumber) close to the antiferro- to ferrolectric transition. |
| title | Landau theory applied to antiferroelectric ordering in ferroelectric nematic liquid crystals |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2605.11413 |