Superlubricity of graphite.

By M. Dienwiebel, G. S. Verhoeven, N. Pradeep, J. Frenken, J. Heimberg, H. Zandbergen. Physical Review Letters, 2004

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Friction and energy dissipation mechanisms in adsorbed molecules and molecularly thin films (2012, methodology): “The variation of sliding friction with rotation angle has been well documented by means of AFM experiments for the case of graphite on graphite [363,364] (Figure 48, upper left) and also SFA measurements for mica on mica [218] (Figure 48, upper right).”
Observation of Van Hove singularities in twisted graphene layers (2009, methodology): “A method to vary θ in situ (and thus to control the position of the VHSs) using an AFM was demonstrated in the discovery of superlubricity in graphit”
Nanotribological Properties of Fluorinated, Hydrogenated, and Oxidized Graphenes (2013, background): “Previously, several possible mechanisms were proposed for nanoscale friction on graphene, including (1) commensurate contact between the tip and sample [31, 32], (2) electron–phonon coupling [9], and (3) the puckering effect [10, 13].”
Modeling and simulation in tribology across scales: An overview (2018, neutral): “[21] Dienwiebel M, Verhoeven GS, Pradeep N, Frenken JW, Heimberg JA, Zandbergen HW.”