| Title: | Annihilation of highly-charged topological defects |
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| Authors: | ID Klemenčič, Eva (Author)
ID Kurioz, Pavlo (Author)
ID Ambrožič, Milan (Author)
ID Rosenblatt, Charles (Author)
ID Kralj, Samo (Author) |
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| Files: |  Klemencic-2020-Annihilation_of_Highly-Charged.pdf (3,58 MB)
MD5: 97738A8D98365C01D17F42C43C8E5914
 https://doi.org/10.3390/cryst10080673
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FNM - Faculty of Natural Sciences and Mathematics
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| Abstract: | 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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| Keywords: | liquid crystals, topological defects, annihilation, order reconstruction |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 24.06.2020 |
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| Article acceptance date: | 01.08.2020 |
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| Publication date: | 03.08.2020 |
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| Publisher: | MDPI |
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| Year of publishing: | 2020 |
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| Number of pages: | Str. 1-13 |
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| Numbering: | Letn. 10, št. 8, št. članka 673 |
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| PID: | 20.500.12556/DKUM-91658  |
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| UDC: | 532.783 |
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| ISSN on article: | 2073-4352 |
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| COBISS.SI-ID: | 27325443 |
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| DOI: | 10.3390/cryst10080673 |
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| Publication date in DKUM: | 24.01.2025 |
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| Views: | 254 |
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| Downloads: | 18 |
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| Metadata: |    |
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| Categories: | Misc.
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