The jamming route to the glass state in weakly perturbed granular media

摘要: It has been suggested that a common conceptual framework known as ‘jamming’ (refs 1 and 2) may be used to classify wide variety of physical systems; these include granular media3, colloidal suspensions4 glass-forming liquids5, all which display critical slowdown in their dynamics before sudden transition an amorphous rigid state. Decreasing the relevant control parameter (such temperature, drive or inverse density) cause geometrical constraints build up progressively thus restrict accessible part system's phase space. In liquids (thermal molecular systems), jamming is provided by classical vitrification process supercooling, characterized rapidly increasing apparently diverging viscosity at sufficiently low temperatures6,7. driven (athermal) macroscopic systems, similar predicted occur, notably sheared foam vibrated media8,9. Here we report experimental evidence for dynamic behaviour, qualitatively analogous system millimetre-size particles. The medium perturbed isolated tapping continuous vibration, with perturbation intensity serving parameter. We observe random deflection immersed torsion oscillator moves each time grains rearrange, like ‘thermometer’ sensing noise10,11. caution our analogy supercooling based on similarities dynamical rather than quantitative theory.