NDLI: Hedgehogs in the dowser state

Content Provider	Springer Nature Link
Author	Pieranski, Pawel Čopar, Simon Godinho, Maria Helena Dazza, Mallory
Copyright Year	2016
Abstract	We show how to easily generate point defects called hedgehogs, in the so-called quasi-planar texture --the dowser state-- of a nematic layer confined between surfaces with homeotropic anchoring conditions. We point out that the dowser texture can be preserved infinitely in spite of its higher energy with respect to the homogeneous homeotropic texture. For topological reasons the dowser state in a squeezed droplet must contain at least one hedgehog. We submitted this hedgehog to a rotating magnetic field and controlled the continuous evolution, transitioning continuously between radial, hyperbolic and circular hedgehogs, which, just as in previous experiments by Lavrentovich et al., are topologically equivalent states. The dynamics of this transformation is shown to be directly sensitive to energy costs of different geometric configurations of the hedgehog defect and therefore can be used as a rough probe for elastic constants; knowing the principal elastic constants K1,2,3, one can retrieve information about the K24 constant. We propose also a method of generation of hedgehog pairs by application of a Poiseuille flow to a dowser state wound by a rotating magnetic field.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	39
Issue Number	12
e-ISSN	1292895X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-12-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soft Matter: Liquid crystals Soft and Granular Matter, Complex Fluids and Microfluidics Biological and Medical Physics, Biophysics Surfaces and Interfaces, Thin Films Nanotechnology Polymer Sciences Complex Systems
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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