BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//talks.cam.ac.uk//v3//EN
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Topological defect formation in a nematic undergoi
 ng an extreme temperature quench - Igor Musevic (J
 ozef Stefan Institute\; University of Ljubljana  )
DTSTART;TZID=Europe/London:20190516T090000
DTEND;TZID=Europe/London:20190516T094000
UID:TALK124546AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/124546
DESCRIPTION:The Kibble-Zurek mechanism (KZM) describes the for
 mation of topological defects during the rapid cro
 ssing of a second-order phase transition. Several 
 experiments have been performed using nematic liqu
 id crystals\, with the aim being to observe the KZ
 M. Most of the experiments report on the late-stag
 e coarsening dynamics of the defect tangle\, where
 as the mechanism of defect formation in the early 
 stage is still not convincingly demonstrated and l
 acks solid evidence. We have designed an experimen
 t that can generate an extremely rapid crossing of
  the isotropic-nematic phase transition which curr
 ently achieves cooling rates in excess of 40\,000 
 K/s\, with cooling rates as fast as 1\,000\,000 K/
 s being achievable in principle. We have developed
  a novel illumination technique that can take inst
 antaneous images of the quenched sample area with 
 an exposure time of 20 nanoseconds. We have also d
 eveloped a technique to measure the time dependenc
 e of the temperature during the quench. This makes
  it possible to study defect formation with very a
 ccurate timing and an accurate measurement of the 
 local temperature during the quench. The robustnes
 s of the experiment allows for several thousand re
 petitions\, which can greatly improve the statisti
 cs of the measurements. The current status of the 
 experiments is reported. Coauthored by Uros Jagodi
 c and Anna V. Ryzhkova.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:INI IT
END:VEVENT
END:VCALENDAR