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Collective response of the plasma medium is well known and has been exploredextensively in several contexts. The single particle response is typicallytreated as collisional interactions leading to dissipative effects. In thismanuscript a 2D molecular dynamics (MD) simulation of dusty plasma with Yukawainteractions amidst dust grains have been considered in a strongly coupledregime. It has been shown that disturbances induced in the crystal byintroducing highly charged particle elicit both collective and single particleresponses. The single particle collisional interaction often generates highlyenergetic few particles which move with speeds exceeding the acoustic and alsothe shock velocity (which gets excited by the external moving body inserted inthe medium). The dust crystal is observed to crack and deform along the path ofthese energetic particles. Ultimately as they slow down they excite collectiveresponse in the medium. It is thus observed that the medium ahead of the shockgets disturbed by these energetic particles generated by collisionalinteraction. The trailing shock then sees a disturbed medium. It is thus clearthat there is an interesting interplay between the single particle andcollective response in the medium which governs the dynamics.

Interplay of single particle and collective response in molecular dynamics simulation of dusty plasma system