Topological defect transformation and structural transition of two-dimensional colloidal crystals across the nematic to smectic-A phase transition

Topological defect transformation and structural transition of two-dimensional colloidal crystals across the nematic to smectic-A phase transition

We observe that topological defects in nematic colloids are strongly influenced by the elasticity and onset of smectic layering across the nematic (N) to smectic-A (SmA) phase transition. When approaching the SmA phase from above, the nematic hyperbolic hedgehog defect that accompanies a spherical c...

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Veröffentlicht in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2015-03, Vol.91 (3), p.030501-030501, Article 030501
Hauptverfasser: Zuhail, K P, Sathyanarayana, P, Seč, D, Čopar, S, Škarabot, M, Muševič, I, Dhara, S
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container_title Physical review. E, Statistical, nonlinear, and soft matter physics
container_volume 91
creator Zuhail, K P
Sathyanarayana, P
Seč, D
Čopar, S
Škarabot, M
Muševič, I
Dhara, S
description We observe that topological defects in nematic colloids are strongly influenced by the elasticity and onset of smectic layering across the nematic (N) to smectic-A (SmA) phase transition. When approaching the SmA phase from above, the nematic hyperbolic hedgehog defect that accompanies a spherical colloidal inclusion is transformed into a focal conic line in the SmA phase. This phase transformation has a strong influence on the pairwise colloidal interaction and is responsible for a structural transition of two-dimensional colloidal crystals. The pretransitional behavior of the point defect is supported by Landau-de Gennes Q-tensor modeling accounting for the increasing elastic anisotropy.
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title Topological defect transformation and structural transition of two-dimensional colloidal crystals across the nematic to smectic-A phase transition
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