| Naslov: | Annihilation of highly-charged topological defects |
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| Avtorji: | ID Klemenčič, Eva (Avtor)
ID Kurioz, Pavlo (Avtor)
ID Ambrožič, Milan (Avtor)
ID Rosenblatt, Charles (Avtor)
ID Kralj, Samo (Avtor) |
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| Datoteke: |  Klemencic-2020-Annihilation_of_Highly-Charged.pdf (3,58 MB)
MD5: 97738A8D98365C01D17F42C43C8E5914
 https://doi.org/10.3390/cryst10080673
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| Jezik: | Angleški jezik |
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| Vrsta gradiva: | Znanstveno delo |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | FNM - Fakulteta za naravoslovje in matematiko
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| Opis: | 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. |
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| Ključne besede: | liquid crystals, topological defects, annihilation, order reconstruction |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Poslano v recenzijo: | 24.06.2020 |
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| Datum sprejetja članka: | 01.08.2020 |
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| Datum objave: | 03.08.2020 |
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| Založnik: | MDPI |
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| Leto izida: | 2020 |
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| Št. strani: | Str. 1-13 |
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| Številčenje: | Letn. 10, št. 8, št. članka 673 |
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| PID: | 20.500.12556/DKUM-91658  |
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| UDK: | 532.783 |
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| COBISS.SI-ID: | 27325443 |
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| DOI: | 10.3390/cryst10080673 |
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| ISSN pri članku: | 2073-4352 |
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| Datum objave v DKUM: | 24.01.2025 |
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| Število ogledov: | 253 |
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| Število prenosov: | 18 |
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| Metapodatki: |    |
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| Področja: | Ostalo
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