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It is presented a numerical study on the unjamming packing fraction of bi-and polydisperse disk packings, which are generated through compression of amonodisperse crystal. In bidisperse systems, a fraction f_+ = 40% up to 80% ofthe total number of particles have their radii increased by \Delta R, while therest has their radii decreased by the same amount. Polydisperse packings areprepared by changing all particle radii according to a uniform distribution inthe range [-\Delta R,\Delta R]. The results indicate that the critical packingfraction is never larger than the value for the initial monodisperse crystal,\phi = \pi/12, and that the lowest value achieved is approximately the one forrandom close packing. These results are seen as a consequence of the interplaybetween the increase in small-small particle contacts and the local crystallineorder provided by the large-large particle contacts.

From crystal to amorphopus: a novel route towards unjamming in soft disk packings