Dislocations and metastable chevrons in the electroconvective inplane normal roll state of a bent core nematic liquid crystal

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Title:	Dislocations and metastable chevrons in the electroconvective inplane normal roll state of a bent core nematic liquid crystal
Authors:	Krishnamurthy, Kanakapura S Pramod, Tadapatri Viswanath, P.
Keywords:	12months
Issue Date:	7-Oct-2014
Publisher:	Royal Society of Chemistry
Citation:	Soft Matter, 2014, Vol. 10, p 7316
Abstract:	We report experimental results on the formation, dynamics, and annihilation of edge dislocations of opposite topological charge in the electroconvective inplane vortex state of a bent core nematic liquid crystal. The approach of paired, oppositely charged defects toward each other is a two-step process. Near constant velocity at large separation and accelerated motion close to annihilation are found, as in the case of nematic rolls belonging to standard electroconvection. Periodic arrays of dislocations of alternating polarity form upon a sudden, strong elevation of the control parameter. Chevron structures that appear between undulatory defect chains are metastable, and their decay with time is accompanied by an exponential reduction in the dislocation density. The initial periodicity of defect chains also drops exponentially with increasing field
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/6088
ISSN:	1744-6848 (Online) 1744-683X
Alternative Location:	http://dx.doi.org/10.1039/C4SM00906A
Copyright:	2014 Royal Society of Chemistry
Appears in Collections:	Research Papers (SCM)

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