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UID:1-269@lptms.universite-paris-saclay.fr
DTSTART:20140512T113000Z
DTEND:20140512T123000Z
DTSTAMP:20140505T115235Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/journal-club-mar
 tin-trulsson/
SUMMARY:Journal club : Martin Trulsson - LPTMS\, salle 201\, 2ème étage\,
  Bât 100\, Campus d'Orsay - 12 Mai 14 11:30
DESCRIPTION:Paper : Why glass elasticity affects the thermodynamics and fra
 gility of supercooled liquids. PNAS 113 (2013) Le Yan\, Gustavo Düring\, 
 and Matthieu Wyart\nMartin Trulsson \, LPTMS\nSupercooled liquids are char
 acterized by their fragility: The slowing down of the dynamics under cooli
 ng is more sudden and the jump of specific heat at the glass transition is
  generally larger in fragile liquids than in strong ones. Despite the impo
 rtance of this quantity in classifying liquids\, explaining what aspects o
 f the microscopic structure controls fragility remains a challenge. Surpri
 singly\, experiments indicate that the linear elasticity of the glass—a 
 purely local property of the free energy landscape—is a good predictor o
 f fragility. In particular\, materials presenting a large excess of soft e
 lastic modes\, the so-called boson peak\, are strong. This is also the cas
 e for network liquids near the rigidity percolation\, known to affect elas
 ticity. Here we introduce a model of the glass transition based on the ass
 umption that particles can organize locally into distinct configurations t
 hat are coupled spatially via elasticity. The model captures the mentioned
  observations connecting elasticity and fragility. We find that materials 
 presenting an abundance of soft elastic modes have little elastic frustrat
 ion: Energy is insensitive to most directions in phase space\, leading to 
 a small jump of specific heat. In this framework strong liquids turn out t
 o lie the closest to a critical point associated with a rigidity or jammin
 g transition\, and their thermodynamic properties are related to the probl
 em of number partitioning and to Hopfield nets in the limit of small memor
 y.\n
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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