Dynamical modes of sheared confined microscale matter.

摘要: Based on (overdamped) Stokesian dynamics simulations and video microscopy experiments, we study the non equilibrium of a sheared colloidal cluster, which is confined to two-dimensional disk. The experimental system composed mixture paramagnetic magnetic polystyrene particles, are held in disk by time shared optical tweezers. particles located at center actuated an external, rotating field that induces torque. We identify two different steady states monitoring mean angular velocities per ring. first one characterized rare slip events, where inner rings momentarily depin from outer ring, kept static set traps. For second state, find bistability velocities, can be understood analysis events particle trajectories. calculate waiting- jumping distributions estimate scale between slips, also reflected plateau squared azimuthal displacement. dynamical transition further components stress tensor, revealing shear-thinning behavior as well shear overshoots. Finally, briefly discuss observed context stochastic thermodynamics how it may open future directions this field.