Abstract
The microscopic visco-elastic motion of a quasi-2D dustyplasma liquid confined to a width of about 15 interparticle distances undersquare stress pulses shorter than thermal relaxation time from achopped laser beam is investigated experimentally. Thestress-enhanced excitations of hopping vortices are responsible for particles in thelaser driven zone reaching, after a higher initial velocity,a constant nonzero terminal forward velocity and partial plasticdeformation through the loss of the structure memory. Thedriven particles around domains with caged shear motion stillpartially keep the structural memory and demonstrate partialelastic backwards motion with exponential relaxation afterturning off the laser.
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