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SUMMARY:Exotic ordered structures of a thin film of a chiral liquid crysta
 l - Jun-ichi Fukuda (Kyushu University)
DTSTART:20190403T141000Z
DTEND:20190403T145000Z
UID:TALK122536@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<br><br>Liquid crystals<br>fascinated scientists because they 
 exhibit ordered structures in diverse length<br>scales. Here we focus on s
 tructures formed in a thin film of a chiral liquid<br>crystal that allows 
 spontaneous local twist of orientational order. By<br>numerical calculatio
 ns based on a continuum theory describing the orientational<br>order by a 
 second-rank tensor\, we show that a thin film of a chiral liquid<br>crysta
 l exhibit a variety of exotic mesoscale structures depending on<br>tempera
 ture\, film thickness and surface anchoring that dictates the<br>orientati
 onal order at the film surfaces [1\,2]. These structures are understood<br
 >as a result of frustrations between the bulk ordering and the surface<br>
 anchoring\, and include a hexagonal lattice of Skyrmions\, vortex-like top
 ological<br>entities that have been shown to emerge in various condensed m
 atter systems. We<br>also briefly mention the optical properties of these 
 structures [2\,3].<br><br>[1] J. Fukuda and S. &#x17D\;umer\, Phys. Rev. L
 ett.<br>104\, 017801 (2010)\; Phys.<br>Rev. Lett. 106\, 097801 (2011)\; Na
 ture Commun. 2\,<br>246 (2011).<br><br>[2] A. Nych\, J. Fukuda\, et al.\, 
 Nature Phys. 13\,<br>1215 (2017).<br><br><br>[3] J. Fukuda et al.\, Sci. R
 ep. 8\, 17234 (2018).
LOCATION:Seminar Room 2\, Newton Institute
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