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DY: Fachverband Dynamik und Statistische Physik
DY 3: Granular Matter
DY 3.4: Talk
Monday, March 7, 2016, 10:30–10:45, H46
1/f noise on the brink of wet granular melting — •Kai Huang — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany
The collective behavior of a two-dimensional wet granular cluster under horizontal swirling motions is investigated experimentally. Depending on the balance between the energy injection and dissipation, the cluster evolves into various nonequilibrium stationary states with strong internal structure fluctuations with time. Quantitative characterizations of the fluctuations with the bond orientational order parameter q6 reveal power spectra of the form fα with the exponent α closely related to the stationary states of the system. In particular, 1/f type of noise with α≈−1 emerges as melting starts from the free surface of the cluster, suggesting the possibility of using 1/f noise as an indicator for phase transitions in systems driven far from thermodynamic equilibrium.