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SUMMARY:Microscopic origin of excess wings in the relaxation spectra of de
 eply supercooled liquids - Camille Scalliet\, University of Cambridge
DTSTART:20211004T150000Z
DTEND:20211004T153000Z
UID:TALK162322@talks.cam.ac.uk
CONTACT:Dr Christoph Schran
DESCRIPTION:The dielectric loss spectrum of many glass-forming liquids exh
 ibits an excess contribution in the high-frequency part of the α-relaxati
 on peak\, referred to as an ``excess wing’’. The physical origin of th
 e excess wing has been long debated\, but a microscopic understanding rema
 ins elusive. By combining a particle-swap Monte Carlo algorithm to long mo
 lecular dynamics simulations\, we provide a clear microscopic picture for 
 the equilibrium relaxation dynamics of a model atomic supercooled liquid\,
  down to the experimental glass transition at Tg. Near Tg\, structural rel
 axation is initiated by dilute clusters of mobile particles. The distribut
 ion of appearance time of these clusters displays a power law at times muc
 h shorter than the structural relaxation time\, which is responsible for t
 he emergence of an excess wing in the relaxation spectrum. We show that la
 rge dynamically correlated regions at τα originate from the small initia
 l clusters forming the excess wing\, via dynamic facilitation. 
LOCATION:Goldsmiths 1\, Lecture Theatre\, Department of Materials Science 
 &amp\; Metallurgy
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