Campuses:

defects

Thursday, January 18, 2018 - 2:00pm - 2:50pm
Daniel Beller (Brown University)
In thermotropic smectic-A liquid crystals, the strong energetic preference for constant layer spacing often results in the spontaneous formation of focal conic domains (FCDs) to resolve large distortions. Collections of many FCDs self-organize into arrangements such as 2D lattices and polygonal textures, whose packing geometries involve beautiful geometric matching rules to ensure that smectic layers remain smooth. However, strong confinement can frustrate the typical FCD self-organization principles. I will discuss three such scenarios:
Saturday, October 24, 2015 - 10:50am - 11:30am
Epifanio Virga (Università di Pavia)
I will briefly review the phenomenology of the newly discovered (though long predicted) twist-bend nematic phases. Inspired by a few basic experimental facts which have recently been established on a rather firm ground, I propose a continuum elastic theory for these fascinating phases and I explore some of its mathematical consequences.
Friday, October 23, 2015 - 1:45pm - 2:25pm
John Ball (University of Oxford)
Jerry Ericksen’s insights into the understanding of martensitic transformations and liquid crystal mechanics have influenced generations of researchers. I will discuss some results concerning martensitic microstructure morphology in single and polycrystals, and others concerning surface defects in liquid crystals, linked by common themes and related variational structures, drawing from collaborations with S.J. Bedford, C. Carstensen, P. Cesana, B. Hambly, K. Koumatos and H. Seiner.
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