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Title: Two-Dimensional Skyrmions and Other Solitonic Structures in Confinement-Frustrated Chiral Nematics

Abstract

We explore spatially localized solitonic configurations of a director field, generated using optical realignment and laser-induced heating, in frustrated chiral nematic liquid crystals confined between substrates with perpendicular surface anchoring. We demonstrate that, in addition to recently studied torons and Hopf-fibration solitonic structures (hopfions), one can generate a host of other axially symmetric stable and metastable director field configurations where local twist is matched to the surface boundary conditions through introduction of point defects and loops of singular and nonsingular disclinations. The experimentally demonstrated structures include the so-called 'baby-skyrmions' in the form of double twist cylinders oriented perpendicular to the confining substrates where their double twist field configuration is matched to the perpendicular boundary conditions by loops of twist disclinations. We also generate complex textures with arbitrarily large skyrmion numbers. A simple back-of-the-envelope theoretical analysis based on free energy considerations and the nonpolar nature of chiral nematics provides insights into the long-term stability and diversity of these inter-related solitonic field configurations, including different types of torons, cholestric-finger loops, two-dimensional skyrmions, and more complex structures comprised of torons, hopfions, and various disclination loops that are experimentally observed in a confinement-frustrated chiral nematic system.

Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1144820
Report Number(s):
NREL/JA-5900-61548
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 1; Related Information: Article No. 012505
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; boundary conditions; cylinder configurations; nematic liquid crystals; point defects; two dimensional

Citation Formats

. Two-Dimensional Skyrmions and Other Solitonic Structures in Confinement-Frustrated Chiral Nematics. United States: N. p., 2014. Web. doi:10.1103/PhysRevE.90.012505.
. Two-Dimensional Skyrmions and Other Solitonic Structures in Confinement-Frustrated Chiral Nematics. United States. doi:10.1103/PhysRevE.90.012505.
. Thu . "Two-Dimensional Skyrmions and Other Solitonic Structures in Confinement-Frustrated Chiral Nematics". United States. doi:10.1103/PhysRevE.90.012505.
@article{osti_1144820,
title = {Two-Dimensional Skyrmions and Other Solitonic Structures in Confinement-Frustrated Chiral Nematics},
author = {},
abstractNote = {We explore spatially localized solitonic configurations of a director field, generated using optical realignment and laser-induced heating, in frustrated chiral nematic liquid crystals confined between substrates with perpendicular surface anchoring. We demonstrate that, in addition to recently studied torons and Hopf-fibration solitonic structures (hopfions), one can generate a host of other axially symmetric stable and metastable director field configurations where local twist is matched to the surface boundary conditions through introduction of point defects and loops of singular and nonsingular disclinations. The experimentally demonstrated structures include the so-called 'baby-skyrmions' in the form of double twist cylinders oriented perpendicular to the confining substrates where their double twist field configuration is matched to the perpendicular boundary conditions by loops of twist disclinations. We also generate complex textures with arbitrarily large skyrmion numbers. A simple back-of-the-envelope theoretical analysis based on free energy considerations and the nonpolar nature of chiral nematics provides insights into the long-term stability and diversity of these inter-related solitonic field configurations, including different types of torons, cholestric-finger loops, two-dimensional skyrmions, and more complex structures comprised of torons, hopfions, and various disclination loops that are experimentally observed in a confinement-frustrated chiral nematic system.},
doi = {10.1103/PhysRevE.90.012505},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 1,
volume = 90,
place = {United States},
year = {2014},
month = {7}
}

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