Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Glasses (original: DY, joined by DF, CPP)

CPP 13.4: Vortrag

Montag, 31. März 2014, 15:45–16:00, ZEU 146

Mixing random organization and jamming — •Michael Schmiedeberg — Institut für Theoretische Physik 2: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany

The random organization and the athermal jamming transition can both be studied in a unifying model system. We study the mixture of the protocols of the two transitions and argue that such a mixture can be interpreted as the glass transition at small but non-zero temperatures.

In our model system, first particles are randomly distributed and then in each step overlapping particles are displaced. In case of displacements in random directions the so-called random organization transition is observed. For purely deterministic displacements the jamming transition is realized. While the jamming protocol match with a quench of a soft sphere system from infinite to zero temperature without crossing energy barriers, the random displacements of the random organization protocol correspond to thermally activated rearrangements of particles. If in a mixed protocol the probability of random displacements is small but non-zero we find that the transition differs significantly from the purely deterministic jamming transition. We believe that our model system can help to understand why there is a difference between the glass transition at small but non-zero temperatures and the athermal jamming transition.