Magnetically controlled double-twist director configuration of lyotropic chromonic liquid crystals in cylinders: Energetics, topological defects, and instability
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909709029605376 |
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| author | Lee, Junghoon Jeong, Joonwoo |
| author_facet | Lee, Junghoon Jeong, Joonwoo |
| contents | We study experimentally how the double-twist (DT) configuration of cylindrically confined lyotropic chromonic liquid crystals (LCLCs) responds to axial magnetic fields. Our director field model unveils the energetics behind the magnetic field-induced transition in the twist profile of the DT configuration. Additionally, we catalog three different types of topological defects -- residing between the DT domains of opposite handedness -- before and after the field application, and propose a new director field model for the defect with a ring disclination. Lastly, we report a symmetry-breaking instability occurring when the field strength exceeds a critical value, suggesting an eccentric DT director field model that reproduces a helix-like optical texture. Our systematic investigation not only enhances our understanding of LCLC energetics but also provides potential for precise control over DT configurations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20565 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetically controlled double-twist director configuration of lyotropic chromonic liquid crystals in cylinders: Energetics, topological defects, and instability Lee, Junghoon Jeong, Joonwoo Soft Condensed Matter We study experimentally how the double-twist (DT) configuration of cylindrically confined lyotropic chromonic liquid crystals (LCLCs) responds to axial magnetic fields. Our director field model unveils the energetics behind the magnetic field-induced transition in the twist profile of the DT configuration. Additionally, we catalog three different types of topological defects -- residing between the DT domains of opposite handedness -- before and after the field application, and propose a new director field model for the defect with a ring disclination. Lastly, we report a symmetry-breaking instability occurring when the field strength exceeds a critical value, suggesting an eccentric DT director field model that reproduces a helix-like optical texture. Our systematic investigation not only enhances our understanding of LCLC energetics but also provides potential for precise control over DT configurations. |
| title | Magnetically controlled double-twist director configuration of lyotropic chromonic liquid crystals in cylinders: Energetics, topological defects, and instability |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2507.20565 |