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Multistabilne mreže topoloških defektov = Multistable networks of topological defectsHarkai, Saša ; Kralj, SamoTopološki 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.Source: Anali PAZU. - ISSN 2232-416X (Letn. 13, št. 1, jun. 2023, str. 33-49)Type of material - article, component partPublish date - 2023Language - slovenianCOBISS.SI-ID - 162396163
Author
Harkai, Saša |
Kralj, Samo
Topics
tekoči kristali |
nematiki |
topološki defekti |
mreže |
simetrija
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Harkai, Saša | 39136 |
Kralj, Samo | 08612 |
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