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  Cross-talk between topological defects in different fields revealed by nematic microfluidics

Giomi, L., Kos, Z., Ravnik, M., & Sengupta, A. (2017). Cross-talk between topological defects in different fields revealed by nematic microfluidics. Proceedings of the National Academy of Sciences of the United States of America, 114(29), E5771-E5777. doi:10.1073/pnas.1702777114.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D26E-C Version Permalink: http://hdl.handle.net/21.11116/0000-0002-989D-2
Genre: Journal Article

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 Creators:
Giomi, L., Author
Kos, Z., Author
Ravnik, M., Author
Sengupta, Anupam1, Author              
Affiliations:
1Group Structure formation in soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063301              

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Free keywords: multifield topology; nematic liquid crystals; topological defects; microfluidics; cross-interactions
 Abstract: Topological defects are singularities in material fields that play a vital role across a range of systems: from cosmic microwave background polarization to superconductors and biological materials. Although topological defects and their mutual interactions have been extensively studied, little is known about the interplay between defects in different fields-especially when they coevolve-within the same physical system. Here, using nematic microfluidics, we study the cross-talk of topological defects in two different material fields-the velocity field and the molecular orientational field. Specifically, we generate hydrodynamic stagnation points of different topological charges at the center of star-shaped microfluidic junctions, which then interact with emergent topological defects in the orientational field of the nematic director. We combine experiments and analytical and numerical calculations to show that a hydrodynamic singularity of a given topological charge can nucleate a nematic defect of equal topological charge and corroborate this by creating -1, -2, and -3 topological defects in four-, six-, and eight-arm junctions. Our work is an attempt toward understanding materials that are governed by distinctly multifield topology, where disparate topology-carrying fields are coupled and concertedly determine the material properties and response.

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Language(s): eng - English
 Dates: 2017-07-032017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1073/pnas.1702777114
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 114 (29) Sequence Number: - Start / End Page: E5771 - E5777 Identifier: -