Regensburg 2022 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 20: Active Matter 4 (joint session DY/BP/CPP)

BP 20.8: Vortrag

Mittwoch, 7. September 2022, 17:00–17:15, H18

Perturbing the athermal jamming transition by activity — •Michael Schmiedeberg — Friedrich-Alexander-Universität Erlangen-Nürnberg, 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 three dimensions [1]. We consider the jamming of active particles where the activity corresponds to a perturbation to the athermal jamming process. We find that due to the activity the transition becomes continuous and the transition packing fraction might occur at a different density [2]. The critical exponents agree to those of the universality class of directed percolation. As a consequence, athermal jamming of passive particles seems to be a (singular) limit of the jamming transition in an active system. Note that other perturbation like thermal fluctuations lead to a similar behavior [3]. Therefore, athermal active particles can be seen as a prototype system that leads to new insights how jamming with perturbations (as also studied in [2-5]) can be related to glassy dynamics.

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

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

[3] M. Maiti and M. Schmiedeberg, Scientific Reports 8, 1837 (2018); for 2D: Eur. Phys. J. E 42, 38 (2019).

[4] L. Milz and M. Schmiedeberg, Phys. Rev. E 88, 062308 (2013).

[5] S. Wilken et al., Phys. Rev. Lett. 127, 038002 (2021).