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SUMMARY:Supercooled Dynamics and Potential Energy Landscape of a Molecular
  Glass-Former - Sam Niblett
DTSTART:20151016T112000Z
DTEND:20151016T114000Z
UID:TALK61281@talks.cam.ac.uk
CONTACT:Alex Thom
DESCRIPTION:Relaxation times and transport processes of many glass-forming
  liquids exhibit super-Arrhenius temperature dependence in the supercooled
  regime. I will show that\, for a coarse-grained model of ortho-terphenyl 
 as well as for previously-studied atomic systems\, this behaviour arises f
 rom increasingly negative correlations in particle displacements as the te
 mperature is decreased.\nParticle movement in the supercooled regime is be
 lieved to separate into diffusive and non-diffusive rearrangements. Attemp
 ts to arrive at a microscopic definition of the former\, termed "cage brea
 ks" will be discussed.\nFinally\, I will present a sampled view of the pot
 ential energy landscape (PEL) of ortho-terphenyl and use the cage breaking
  definition to identify a hierarchical structure in this landscape.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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