Eva Klemenčič (Avtor), Pavlo Kurioz (Avtor), Milan Ambrožič (Avtor), Charles Rosenblatt (Avtor), Samo Kralj (Avtor)

Povzetek

We studied numerically external stimuli enforced annihilation of a pair of daughter nematic topological defect (TD) assemblies bearing a relatively strong topological charge |m|=3/2. A Landau- de Gennes phenomenological approach in terms of tensor nematic order parameter was used in an effectively two-dimensional Cartesian coordinate system, where spatial variations along the z-axis were neglected. A pair of {m=3/2,m=−3/2} was enforced by an appropriate surface anchoring field, mimicking an experimental sample realization using the atomic force microscope (AFM) scribing method. Furthermore, defects were confined within a rectangular boundary that imposes strong tangential anchoring. This setup enabled complex and counter-intuitive annihilation processes on varying relevant parameters. We present two qualitatively different annihilation paths, where we either gradually reduced the relative surface anchoring field importance or increased an external in-plane spatially homogeneous electric field E. The creation and depinning of additional defect pairs {12,−12} mediated the annihilation in such a geometry. Furthermore, we illustrate the absorption of TDs by sharp edges of the confining boundary, accompanied by m=±1/4↔∓1/4 winding reversal of edge singularities, and also E-driven zero-dimensional to one-dimensional defect core transformation.

Ključne besede

liquid crystals;topological defects;annihilation;order reconstruction;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UM FNM - Fakulteta za naravoslovje in matematiko
Založnik: MDPI
UDK: 532.783
COBISS: 27325443 Povezava se bo odprla v novem oknu
ISSN: 2073-4352
Št. ogledov: 0
Št. prenosov: 0
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: tekoči kristali;topološki defekti;anihilacija;rekonstrukcija reda;
Vrsta dela (COBISS): Znanstveno delo
Strani: str. 1-13
Letnik: ǂVol. ǂ10
Zvezek: ǂno. ǂ8
Čas izdaje: Aug. 2020
DOI: 10.3390/cryst10080673
ID: 25769847