Confinement and magnetic field effect on chiral ferroelectric nematic in Grandjean-Cano wedge cells
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Thapa, Kamal Iadlovska, Olena S. Basnet, Bijaya Wang, Hao Paul, Ayusha Gleeson, James T. Lavrentovich, Oleg D. |
| author_facet | Thapa, Kamal Iadlovska, Olena S. Basnet, Bijaya Wang, Hao Paul, Ayusha Gleeson, James T. Lavrentovich, Oleg D. |
| contents | We explore the structure and magnetic field response of edge dislocations in Grandjean-Cano wedge cells filled with chiral mixtures of the ferroelectric nematic mesogen DIO. Upon cooling, the ordering changes from paraelectric in the cholesteric phase N* to antiferroelectric in the smectic SmZ_A* and to ferroelectric in the cholesteric N_F*. Dislocations of the Burgers vector b equal the helicoidal pitch P are stable in all three phases, while dislocations with b=P/2 exist only in the N* and SmZ_A*. The b=P/2 dislocations split into pairs of τ(-1/2) λ(+1/2) disclinations, while the thick dislocations b=P are pairs of nonsingular λ(-1/2) λ(+1/2) disclinations. The polar order makes the τ(-1/2) disclinations unstable in the N_F* phase, as they should be connected to singular walls in the polarization field. We propose a model of transformation of the composite τ(-1/2) line-wall defect into a nonsingular λ(-1/2) disclination, which is paired up with a λ(+1/2) line to form a b=P dislocation. The SmZ_A* behavior in the in-plane magnetic field is different from that of the N_F* and N*: the dislocations show no zigzag instability, and the pitch remains unchanged in the magnetic fields up to 1 T. The behavior is associated with the finite compressibility of smectic layers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_20229 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Confinement and magnetic field effect on chiral ferroelectric nematic in Grandjean-Cano wedge cells Thapa, Kamal Iadlovska, Olena S. Basnet, Bijaya Wang, Hao Paul, Ayusha Gleeson, James T. Lavrentovich, Oleg D. Soft Condensed Matter We explore the structure and magnetic field response of edge dislocations in Grandjean-Cano wedge cells filled with chiral mixtures of the ferroelectric nematic mesogen DIO. Upon cooling, the ordering changes from paraelectric in the cholesteric phase N* to antiferroelectric in the smectic SmZ_A* and to ferroelectric in the cholesteric N_F*. Dislocations of the Burgers vector b equal the helicoidal pitch P are stable in all three phases, while dislocations with b=P/2 exist only in the N* and SmZ_A*. The b=P/2 dislocations split into pairs of τ(-1/2) λ(+1/2) disclinations, while the thick dislocations b=P are pairs of nonsingular λ(-1/2) λ(+1/2) disclinations. The polar order makes the τ(-1/2) disclinations unstable in the N_F* phase, as they should be connected to singular walls in the polarization field. We propose a model of transformation of the composite τ(-1/2) line-wall defect into a nonsingular λ(-1/2) disclination, which is paired up with a λ(+1/2) line to form a b=P dislocation. The SmZ_A* behavior in the in-plane magnetic field is different from that of the N_F* and N*: the dislocations show no zigzag instability, and the pitch remains unchanged in the magnetic fields up to 1 T. The behavior is associated with the finite compressibility of smectic layers. |
| title | Confinement and magnetic field effect on chiral ferroelectric nematic in Grandjean-Cano wedge cells |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2403.20229 |