Frictionless nanohighways on crystalline surfaces

Abstract

The understanding of friction at nano-scales, ruled by the regular arrangement of atoms, is surprisingly incomplete. Here we provide a unified understanding by studying the interlocking potential energy of two infinite contacting surfaces with arbitrary lattice symmetries, and extending it to finite contacts. We categorize, based purely on geometrical features, all possible contacts into three different types: a structurally lubric contact where the monolayer can move isotropically without friction, a corrugated and strongly interlocked contact, and a newly discovered directionally structurally lubric contact where the layer can move frictionlessly along one specific direction and retains finite friction along all other directions. This novel category is energetically stable against rotational perturbations and provides extreme friction anisotropy. The finite-size analysis shows that our categorization applies to a wide range of technologically relevant materials in contact, from adsorbates on crystal surfaces to layered two-dimensional materials and colloidal monolayers.

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• Critical Peeling of Tethered Nanoribbons
• Ballistic nanofriction

Cited by in corpus (6)

• The twisting dynamics of large lattice mismatch van der Waals heterostructures
• Kinetic Friction of Structurally Superlubric 2D Material Interfaces
• Evidence of directional structural superlubricity and Lévy flights in a van der Waals heterostructure
• Programming frictionless interfaces for moiré layers
• Striped twisted state in the orientational epitaxy on quasicrystals
• Can Neural Networks Learn Nanoscale Friction?