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Title:Stable assemblies of topological defects in nematic orientational order
Authors:ID Hölbl, Arbresha (Author)
ID Mesarec, Luka (Author)
ID Polanšek, Juš (Author)
ID Iglič, Aleš (Author)
ID Kralj, Samo (Author)
Files:.pdf RAZ_Holbl_Arbresha_2023.pdf (6,14 MB)
MD5: FAF1238FF85AF9BCB3339A017AF54C77
URL https://pubs.acs.org/doi/10.1021/acsomega.2c07174#
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:We considered general mechanisms enabling the stabilization of localized assemblies of topological defects (TDs). There is growing evidence that physical fields represent fundamental natural entities, and therefore these features are of interest to all branches of physics. In general, cores of TDs are energetically costly, and consequently, assemblies of TDs are unfavorable. Owing to the richness of universalities in the physics of TDs, it is of interest to identify systems where they are easily experimentally accessible, enabling detailed and well-controlled analysis of their universal behavior, and cross-fertilizing knowledge in different areas of physics. In this respect, thermotropic nematic liquid crystals (NLCs) represent an ideal experiment testbed for such studies. In addition, TDs in NLCs could be exploited in several applications. We present examples that emphasize the importance of curvature imposed on the phase component of the relevant order parameter field. In NLCs, it is represented by the nematic tensor order parameter. Using a simple Landau-type approach, we show how the coupling between chirality and saddle splay elasticity, which can be expressed as a Gaussian curvature contribution, can stabilize Meron TDs. The latter have numerous analogs in other branches of physics. TDs in 2D curved manifolds reveal that the Gaussian curvature dominantly impacts the assembling and stabilization of TDs. Furthermore, a strong enough curvature that serves as an attractor for TDs is a respective field that could be imposed in a fast enough phase transition. Assemblies of created TDs created in such a disordered environment could be stabilized by appropriate impurities.
Keywords:topological defects, nematic liquid crystals, Gaussian curvature, topological charge
Publication status:Published
Publication version:Version of Record
Submitted for review:07.11.2022
Article acceptance date:07.12.2022
Publication date:20.12.2022
Publisher:American Chemical Society
Year of publishing:2023
Number of pages:169-179
Numbering:Vol. 8, iss. 1
PID:20.500.12556/DKUM-84744 New window
ISSN on article:2470-1343
COBISS.SI-ID:137430275 New window
DOI:10.1021/acsomega.2c07174 New window
Publication date in DKUM:17.07.2023
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Record is a part of a journal

Title:ACS omega
Shortened title:ACS omega
Publisher:American Chemical Society
COBISS.SI-ID:525873945 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0099
Name:Fizika mehkih snovi, površin in nanostruktur

Funder:ARRS - Slovenian Research Agency
Project number:J1-2457
Name:Fazni prehodi proti koordinaciji v večplastnih omrežjih

Funder:ARRS - Slovenian Research Agency
Project number:J2-4447
Name:Vpliv mehanike in topologije membrane na celično ujetje bakterij, virionov in anorganskih delcev


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

Keywords:topološki defekti, nematski tekoči kristali, Gaussova ukrivljenost, topološki naboj


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