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Title:Multistabilne mreže topoloških defektov
Authors:ID Harkai, Saša (Author)
ID Kralj, Samo (Author)
Files:.pdf Multistabilne_mreze_topoloskih-Harkai-2023.pdf (1,26 MB)
MD5: FC7EE6F7C0DA763D17EA8A43EDC09339
 
URL https://journals.um.si/index.php/anali-pazu/article/view/2916
 
Language:Slovenian
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:UZUM - University of Maribor Press
Abstract:Topološki defekti se pojavijo ob faznih prehodih, pri katerih pride do zloma simetrije in so vseprisotni v naravi. Okolje, v katerem jih najlažje lahko preučujemo, so nematski tekoči kristali. Nematske strukture opišemo na mezoskopski skali s tenzorskim ureditvenim parametrom in določimo ravnovesna stanja z numerično minimizacijo proste energije. V sistem vsiljujemo topološke defekte preko robnih pogojev na mejnih površinah. Najprej pokažemo, da se že z vsiljevanjem enega defekta lahko vzpostavijo različna ravnovesna stanja glede na debelino celice. V primeru vsiljevanja večih defektov na spodnji mejni površini lahko v sistemu vzpostavimo ravnovesna stanja z "nenabitimi" linijskimi defekti. Z vsiljevanjem 4x4 kvadratne mreže defektov lahko v sistemu vzpostavimo kompleksne vzorce nenabitih linijskih defektov, kjer jih je 18 kvantitativno in 7 kvalitativno različnih. Prikažemo, da lahko z uporabo zunanjega električnega polja reverzibilno prehajamo iz enega vzorca v drugega. Prikazani sistemi bi se lahko uporabili v multistabilnih optičnih prikazovalnikih in prevezljivih nanožičkah.
Keywords:tekoči kristali, nematiki, topološki defekti, mreže, simetrija
Publication status:Published
Publication version:Version of Record
Submitted for review:12.09.2023
Publication date:09.06.2023
Place of publishing:Maribor
Publisher:Univerza v Mariboru, Univerzitetna založba
Year of publishing:2023
Number of pages:17
Numbering:Letn.13, št.1
PID:20.500.12556/DKUM-97260 New window
UDC:532.783
ISSN on article:2820-364X
COBISS.SI-ID:162396163 New window
DOI:10.18690/analipazu.13.1.33-50.2023 New window
Publication date in DKUM:25.02.2026
Views:176
Downloads:5
Metadata:XML DC-XML DC-RDF
Categories:Misc.
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Record is a part of a journal

Title:Anali PAZU
Publisher:Združenje Pomurska akademsko znanstvena unija, Združenje Pomurska akademsko znanstvena unija, Univerzitetna založba Univerze v Mariboru
ISSN:2232-416X
COBISS.SI-ID:257553152 New window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
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

Language:English
Title:Multistable Networks of Topological Defects
Abstract:Topological defects are a consequence of symmetry-breaking phase transitions and are ubiquitous in nature. An environment where they most easily studied, are nematic liquid crystals. We describe nematic structures at the mesoscopic scale with a tensor order parameter and we determine equilibrium states by numerically minimizing free energy. We enforce defects through boundary conditions at enclosing surfaces. First we show that there are multiple equilibrium states possible by just enforcing one defect, depending on the thickness of the cell. While enforcing multiple defects at the bottom surface we can create equilibrium states with "chargeless" line defects. By enforcing a 4x4 network of defects we can create complex patterns of chargeless line defects, where 18 are quantitatively and 7 are qualitatively different. We also demonstrate how to rewire the line defects to transition from one pattern to another and back. Our system could lead to multistable optical displays and rewirable nanowires.
Keywords:liquid crystal, nematics, topological defects, networks, symmetry


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  1. Anali PAZU

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