Programming frictionless interfaces for moiré layers

Abstract

Structural superlubricity in van der Waals layered systems holds immense promise for diverse nanoscale contacts devices and energy-efficient applications. While all-direction structural superlubricity has been widely investigated, the understanding towards the more fundamental directional structural superlubricity requires further attentions. In this study, we reveal the physical origins of directional structural superlubricity, which reduces to all-direction superlubricity under certain conditions. By investigating the evolution of incomplete moiré tiles at crystalline interfaces, our general scaling approaches establish the mapping from geometry to tunable directional superlubricity, agreeing with large scale molecular dynamics simulations at both homogeneous or heterogeneous interfaces. Furthermore, diverse programmable frictionless motions of nanoflakes traveling inside double-surface nanoconfinement systems can be achieved. Our work delivers new insights into the design of ultra-low frictional interfaces for future nanoscale tribology and nanoconfinement transport.

References in corpus (4)

• Size effect in ion transport through angstrom-scale slits
• Robust Superlubricity in Graphene/h-BN Heterojunctions
• Tunable macroscale structural superlubricity in two-layer graphene via strain engineering
• Restriction of macroscopic structural superlubricity due to structure relaxation by the example of twisted graphene bilayer