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Topological transition from a hopfion to a toron via flexoelectric self-polarization in chiral liquid crystals
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.ORCID iD: 0000-0002-6012-0034
2025 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 7, no 4, article id 043001Article in journal (Refereed) Published
Abstract [en]

The presence of topological defects in apolar chiral liquid crystals causes orientational distortions, leading to nonuniform strain. This nonuniform strain generates an electric polarization response due to the flexoelectric effect, which induces an internal electric field. Associated with this electric field is an electrostatic self-energy, which has a backreaction on the director field. Calculation of this internal electric field and its resulting backreaction on the director field is complicated. We propose a method to do such, adapting a method recently developed to study the magnetostatic self-interaction effect on skyrmions in chiral ferromagnets. Bloch skyrmions in chiral magnets are solenoidal and are unaffected by the magnetostatic self-interaction. However, Bloch skyrmions in liquid crystals yield nonsolenoidal flexoelectric polarization and, thus, are affected by the electrostatic self-interaction. Additionally, as the flexoelectric coefficients are increased in strength, a transition from a hopfion to a toron is observed in three-dimensional confined systems.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2025. Vol. 7, no 4, article id 043001
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-373668DOI: 10.1103/gy6m-m7ckISI: 001593075500002Scopus ID: 2-s2.0-105022444171OAI: oai:DiVA.org:kth-373668DiVA, id: diva2:2020742
Note

QC 20251211

Available from: 2025-12-11 Created: 2025-12-11 Last updated: 2025-12-11Bibliographically approved

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Leask, Paul

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