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DF: Fachverband Dielektrische Festkörper

DF 28: Slow Dynamics in Glasses and Granular Matter II (Joint Focus Session with DY and CPP)

DF 28.1: Invited Talk

Friday, April 4, 2014, 09:30–10:00, HÜL 186

Critical Rheology of Weakly Vibrated Granular Media — •Martin Van Hecke — Huygens-Kamerlingh Onnes Lab, Leiden University

We experimentally probe the rheology of weakly vibrated granular media, and show that much of it is controlled by a nontrivial 2nd order-like critical point that occurs at finite stress and vibration strength. Close to this critical points, fluctuations become strong, correlation times diverge, and the flow curves exhibit scaling. For smaller vibrations, a 1st order transition emerges which separates a glassy phase from a rapidly flowing phase.