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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-439@lptms.universite-paris-saclay.fr
DTSTART:20160616T110000Z
DTEND:20160616T120000Z
DTSTAMP:20160603T115303Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-pierre-ronceray-mr-x-seminaire-exceptionnel/
SUMMARY:Séminaire du LPTMS: Pierre Ronceray &amp\; Stefano Spigler  *** s
 éminaire exceptionnel *** - LPTMS\, salle 201\, 2ème étage\, Bât 100\,
  Campus d'Orsay - 16 Juin 16 11:00
DESCRIPTION:1) Stefano Spigler : "Distribution of avalanches in perturbed d
 isordered systems"\nDisordered systems under a perturbation usually show a
  stepwise response\, due to the existence of many\, sample dependent\, loc
 al energy minima. In this talk I will show that the distribution of the ju
 mps (static avalanches) of the total energy\, under some generic assumptio
 ns\, depends on the specific system only through its (replica symmetry bre
 aking) order parameter.\n2) Pierre Ronceray : "Suppression of crystalline 
 order by competing liquid structures"\nUpon cooling\, a molecular liquid w
 ill eventually either crystallize\, or continuously arrest in a amorphous 
 state known as a glass.  What features of the liquid determine this fate?
  Why is crystallization avoided in glass-formers?  As the liquid is coole
 d down\, the local arrangements of its constituent molecules will increasi
 ngly correspond to low-energy configurations.  It is likely that the loca
 l structure characterizing the crystalline ground state will be found amon
 g these stable arrangements\, and one can thus expect that it will accumul
 ate on cooling. However\, other non-crystalline structures can also be sta
 ble in the liquid\, and compete with the accumulation of crystalline order
 . On what conditions can such a competition stabilize the supercooled liqu
 id to the point of dynamical arrest? We tackle this question using a latti
 ce model where both the crystalline order and the non-crystalline structur
 es are explicitly specified in terms of local configuration of binary spin
 s.  We show that in order to efficiently suppress crystallization\, the n
 on-crystalline structure should be energetically and entropically favoured
 . Importantly\, we demonstrate that it must also geometrically antagonize 
 crystalline order. We quantify this effect in terms of overlap of structur
 es: crystal-''agonist'' structures with good overlap with the crystal tend
  to facilitate crystallization\, while crystal-antagonist ones tend to imp
 ede it and dramatically increase the crystal nucleation time.\n\n&nbsp\;
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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