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Naslov:Effective topological charge cancelation mechanism
Avtorji:Mesarec, Luka (Avtor)
Góźdź, Wojciech (Avtor)
Iglič, Aleš (Avtor)
Kralj, Samo (Avtor)
Datoteke:.pdf Scientific_Reports_2016_Mesarec_et_al._Effective_Topological_Charge_Cancelation_Mechanism.pdf (2,15 MB)
 
URL http://www.nature.com/articles/srep27117
 
Jezik:Angleški jezik
Vrsta gradiva:Znanstveno delo (r2)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FNM - Fakulteta za naravoslovje in matematiko
Opis:Topological defects (TDs) appear almost unavoidably in continuous symmetry breaking phase transitions. The topological origin makes their key features independent of systems’ microscopic details; therefore TDs display many universalities. Because of their strong impact on numerous material properties and their significant role in several technological applications it is of strong interest to find simple and robust mechanisms controlling the positioning and local number of TDs. We present a numerical study of TDs within effectively two dimensional closed soft films exhibiting in-plane orientational ordering. Popular examples of such class of systems are liquid crystalline shells and various biological membranes. We introduce the Effective Topological Charge Cancellation mechanism controlling localised positional assembling tendency of TDs and the formation of pairs {defect, antidefect} on curved surfaces and/or presence of relevant “impurities” (e.g. nanoparticles). For this purpose, we define an effective topological charge Δmeff consisting of real, virtual and smeared curvature topological charges within a surface patch Δς identified by the typical spatially averaged local Gaussian curvature K. We demonstrate a strong tendency enforcing Δmeff → 0 on surfaces composed of Δς exhibiting significantly different values of spatially averaged K. For Δmeff ≠ 0 we estimate a critical depinning threshold to form pairs {defect, antidefect} using the electrostatic analogy.
Ključne besede:topological defects, topological charge, numerical studies, orientational ordering, nematic liquid crystals, liquid crystalline shells, biological membranes, nanoparticles, Gaussian curvature, electrostatic analogy, annihilation, topology
Leto izida:2016
Št. strani:str. 1-9
Številčenje:Letn. 6
ISSN:2045-2322
UDK:515.1
URN:URN:SI:UM:DK:HNWZJJU0
COBISS_ID:22256136 Povezava se odpre v novem oknu
DOI:10.1038/srep27117 Povezava se odpre v novem oknu
ISSN pri članku:2045-2322
Licenca:CC BY 4.0
To delo je dosegljivo pod licenco Creative Commons Priznanje avtorstva 4.0 Mednarodna
Število ogledov:193
Število prenosov:67
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Gradivo je del revije

Naslov:Scientific Reports
Založnik:Nature Publishing Group
ISSN:2045-2322
COBISS.SI-ID:18727432 Novo okno

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P1-0099
Naslov:Fizika mehkih snovi, površin in nanostruktur

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:topološki defekti, topološki naboj, numerične raziskave, orientacijski red, nematični tekoči kristali, tekoče kristalne lupine, biološke membrane, nanodelci, Gaussova ukrivljenost, elektrostatična analogija, anihilacija, topologija


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