Article Synopsis
- Van der Waals (vdW) layered materials exhibit ultra-low friction at incommensurate contact interfaces due to weak interlayer interactions and strong intralayer bonding, leading to a phenomenon called structural superlubricity.
- The study uses cracks in vdW crystals and microfabrication techniques to analyze how different regions (edge, complete moiré tile, and incomplete moiré rim) contribute to friction, with the incomplete moiré rim being particularly influential.
- A proposed friction law for vdW heterojunctions reveals that friction behavior shifts with normal force and is influenced by the presence of moiré ridges and edge atom dissipation.
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Article Abstract
The weak interlayer interaction and strong intralayer bonding in Van der Waals (vdW) layered materials give rise to ultralow friction at incommensurate contact interfaces, a phenomenon known as structural superlubricity. This phenomenon is complicated by the interplay between atomic degrees of freedom, twist angle, and normal force. In this Letter, we exploit naturally occurring cracks in vdW crystals and microfabrication techniques to qualitatively separate the contributions of edge, complete moiré tile, and incomplete moiré rim regions. It is observed that friction from the incomplete moiré rim region, scaling linearly with the rim area, plays a dominant role in determining the twist angle dependence of friction. Interestingly, despite lower friction contributions from complete moirés, friction from a complete moiré tile is independent of moiré size; consequently, friction from the moiré tile scales linearly with the total number of moirés. By integrating the contributions from edge, moiré tile, and incomplete moiré rim, a friction law for vdW heterojunctions is proposed. Finally, friction changes from positively to negatively correlating with normal force, contingent on the suppression of moiré ridge and the dissipation from edge atoms.
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| http://dx.doi.org/10.1103/PhysRevLett.133.126202 | DOI Listing |
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