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SUMMARY:Design of passive and active passive nematic defects - Miha Ravnik
  (University of Ljubljana  \; Jozef Stefan Institute)
DTSTART:20190515T101000Z
DTEND:20190515T105000Z
UID:TALK124486@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Complex &ndash\;passive or active- nematic fluids are characte
 rised by internal orientational order\, which upon tuning or frustration\,
  can exhibit topological defects. The type of defects and their role natur
 ally depend on dimensionality of the system\, but importantly also on the 
 geometry\, confinement\, flow\, driving or even activity.  Here\, we prese
 nt design of topological defects in passive and active nematic complex flu
 ids &ndash\; forming umbilic defects\, singular loops\, point defects and 
 disclinations. Specifically\, we show in passive nematics how confinement 
 in the form of complex geometry and fractal surfaces can lead to formation
  of various defect-based nematic profiles\, including exhibiting high-elas
 tic multipoles. In active nematics\, we show defect profiles in three-dime
 nsional active nematic droplet\, also highlighting the role of different s
 urface coupling regimes.
LOCATION:Seminar Room 1\, Newton Institute
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