Journal
PHYSICAL REVIEW LETTERS
Volume 129, Issue 27, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.276101
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Funding
- Sackler Center for Computational Molecular and Materials Science
- Ratner Center for Single Molecule Science at Tel Aviv University
- Israel Science Foundation
- ISF-NSFC joint Grant
- Heineman Chair in Physical Chemistry, Tel Aviv University Center for Nanoscience and Nanotechnology
- Naomi Foundation
- Sackler Center for Computational Molecular and Materials Science
- Ratner Center for Single Molecule Science at Tel Aviv University
- Israel Science Foundation
- ISF-NSFC joint Grant
- Heineman Chair in Physical Chemistry, Tel Aviv University Center for Nanoscience and Nanotechnology
- Naomi Foundation
- [1141/18]
- [1586/17]
- [3191/19]
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A new frictional mechanism based on collective stick-slip motion of moire superstructures across polycrystalline two-dimensional material interfaces is predicted. This phenomenon is expected to occur in various large-scale layered material interfaces, such as h-BN/graphene.
A new frictional mechanism, based on collective stick-slip motion of moire superstructures acrosspolycrystalline two-dimensional material interfaces, is predicted. The dissipative stick-slip behaviororiginates from an energetic bistability between low- and high-commensurability configurations of large-scale moire superstructures. When the grain boundary separates between grains of small and largeinterfacial twist angle, the corresponding moire periods are significantly different, resulting in forbiddengrain boundary crossing of the moire superstructures during shear induced motion. For small twist anglegrains, where the moire periods are much larger than the lattice constant, this results in multiple reflectionsof collective surface waves between the surrounding grain boundaries. In combination with the individualgrain boundary dislocation snap-through buckling mechanism dominating at the low normal load regime,the friction exhibits nonmonotonic behavior with the normal load. While the discovered phenomenon isdemonstrated for h-BN/graphene polycrystalline junctions, it is expected to be of general nature and occurin many other large-scale layered material interfaces.
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