SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Soft Matter (joint session CPP/DY)

CPP 7.7: Vortrag

Mittwoch, 29. September 2021, 12:15–12:30, H3

Perturbed Jamming transitionsMoumita Maiti1 and •Michael Schmiedeberg21Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 2Institut für Theoretische Physik 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

By minimizing the interaction energy in a soft sphere system without crossing energy barriers the discontinuous athermal jamming transion can be observed at a packing fraction of about 0.64 in 3D [1]. However, if perturbations like thermal fluctuations [2] or an active self-propulsion [3] are added, the transition becomes continuous and the transition packing fraction might occur at a different density. For example, in case of thermal fluctuations, the transition packing fraction approaches 0.55 in case of small thermal fluctuations [2]. We show that the thermal jamming transition lies within the universality class of directed percolation. As a consequence, athermal jamming is a (singular) limit of a much wider class of perturbed jamming transitions that can also be understood as dynamical transitions [2,4]. Therefore, perturbed jamming transitions open up a large variety of amorphous packings and insights how these packings are related to glassy dynamics.

[1] C.S. O'Hern et al., Phys. Rev. Lett. 88, 075507 (2002), Phys. Rev. E 68, 011306 (2003).

[2] M. Maiti and M. Schmiedeberg, Scientific Reports 8, 1837 (2018).

[3] M. Maiti and M. Schmiedeberg, EPL 126, 46002 (2019).

[4] L. Milz and M. Schmiedeberg, Phys. Rev. E 88, 062308 (2013); S. Wilken et al., Phys. Rev. Lett. 127, 038002 (2021).

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