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Stick-slip -- the sequence of mechanical instabilities through which a slideradvances on a solid substrate -- is pervasive throughout sliding friction, fromnano to geological scales. Here we suggest that trapped cold ions in an opticallattice can also be of help in understanding stick-slip friction, and also theway friction changes when one of the sliders undergoes structural transitions.For that scope, we simulated the dynamical properties of a 101-ions chain,driven to slide back and forth by a slowly oscillating electric field in anincommensurate periodic "corrugation" potential of increasing magnitude U0. Wefound the chain sliding to switch, as U0 increases and before the Aubrytransition, from a smooth-sliding regime with low dissipation to a stick-slipregime with high dissipation. In the stick-slip regime the onset of overallsliding is preceded by precursor events consisting of partial slips of few ionsonly, leading to partial depinning of the chain, a nutshell remnant ofprecursor events at the onset of motion also observed in macroscopic sliders.Seeking to identify the possible effects on friction of a structuraltransition, we reduced the trapping potential aspect ratio until the ion chainshape turned from linear to zigzag. Dynamic friction was found to rise at thetransition, reflecting the opening of newer dissipation channels.

Stick-Slip Nanofriction in Trapped Cold Ion Chains