Origin of frictional scaling law in circular twist layered interfaces: simulations and theory

Abstract

Structural superlubricity based on twisted layered materials has stimulated great research interests. Recent MD simulations show that the circular twisted bilayer graphene (tBLG) presenting a size scaling of friction with strong Moiré-level oscillations. To reveal the physical origin of observed abnormal scaling, we proposed a theoretical formula and derived the analytic expression of frictional size scaling law of tBLG. The predicted twist angle dependent scaling law agrees well with MD simulations and provides a rationalizing explanation for the scattered power scaling law measured in various experiments. Finally, we show clear evidence that the origin of the scaling law comes from the Moiré boundary, that is, the remaining part of the twisted layered interfaces after deleting the internal complete Moiré supercells. Our work provides new physical insights into the friction origin of layered materials and highlights the importance of accounting for Moiré boundary in the thermodynamic models of layered materials.

17 pages, 11 figures

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Cited by in corpus (6)

• Moiré-Driven Interfacial Thermal Transport in Twisted Transition Metal Dichalcogenides
• The twisting dynamics of large lattice mismatch van der Waals heterostructures
• Emerging chirality and moiré dynamics in twisted layered material heterostructures
• Modular hybrid machine learning and physics-based potentials for scalable modeling of van der Waals heterostructures
• Programming frictionless interfaces for moiré layers
• A survey of interlayer interaction models for graphene and other 2D materials