日時 2019年8月2日(金) 15:00 –
場所大阪大学豊中キャンパス サイバーメディアセンター7F 会議室
題目 Extending the phase space of frictionless jamming from a jamming point to a jamming plane
発表者 Yuliang Jin (中国科学院 理論物理研究所)
The concept of jamming has attracted great research interest due to its broad relevance in soft matter such as liquids, glasses, colloids, foams, and granular materials, and its deep connection to the sphere packing problem and phase transitions. Here we show numerically that the phase space of frictionlessly jammed states can be extended from the well-known jamming point to a jamming plane, by applying shear strains to initial states with different degrees of annealing. We discuss how this jamming plane can be explored by standard athermal and thermal protocols, and relate the protocol-dependence of the explorable phase space to the jamming reversibility. While all jammed states are isostatic and belong to the same universality class, their anisotropies and amorphous orders depend on the density and the shear strain. The jamming point is isotropic, with the minimum amorphous order (or maximum randomness), which, in the thermodynamic limit, sets a sharp lower bound for the jamming density of all frictionless random packings.