Supersonic dislocations observed in a plasma crystal

Details Supersonic dislocations observed in a plasma crystal Supersonic dislocations observed in a plasma crystal

2007-09-12

arxiv.org/abs/0709.1782v1

Physical Review Letters 99, 025002 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.99.025002

Experimental results on the dislocation dynamics in a two-dimensional plasma crystal are presented. Edge dislocations were created in pairs in lattice locations where the internal shear stress exceeded a threshold and then moved apart in the glide plane at a speed higher than the sound speed of shear waves, $C_T$. The experimental system, a plasma crystal, allowed observation of this process at an atomistic (kinetic) level. The early stage of this process is identified as a stacking fault. At a later stage, supersonically moving dislocations generated shear-wave Mach cones.

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