Defect turbulence in quasi-2D creeping dusty-plasma liquids.
We report the intermittent and heterogeneous plastic structural rearrangement at the kinetic level in a quasi-2D creeping dusty-plasma Coulomb liquid through directly tracking each particle trajectory and measuring the evolution of each associated local bond-orientational order. The thermal agitation and external shear have comparable strengths. Their interplay with the Coulomb coupling enhances particle hopping, and induces the loss of local structural memory and avalanche-type excitation of topological defect clusters following the universal scaling behaviors of cluster size in xyt space, akin to the generic behavior of self-organized criticality. Increasing shear tends to reduce the aspect ratio of the temporal to the spatial spans of the defect cluster in xyt space.
Department of Physics, National Central University, Chungli, Taiwan 32054, Republic of China.
Wei-Yen
WY
Woon
Lin
L
I