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Title: Colloquium: Sliding and pinning in structurally lubric 2D material interfaces

Journal Article · · Reviews of Modern Physics
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. International School for Advanced Studies (SISSA), Trieste (Italy); OSTI
  2. International School for Advanced Studies (SISSA), Trieste (Italy); International Centre for Theoretical Physics (ICTP), Trieste (Italy)
  3. Consiglio Nazionale delle Ricerche (CNR) (Italy); International School for Advanced Studies (SISSA), Trieste (Italy)
  4. International School for Advanced Studies (SISSA), Trieste (Italy); International Centre for Theoretical Physics (ICTP), Trieste (Italy); Consiglio Nazionale delle Ricerche (CNR) (Italy)

A plethora of two-dimensional (2D) materials have been introduced in physics and engineering in the past two decades. Their robust, membranelike sheets permit (mostly require) deposition, giving rise to solid-solid dry interfaces whose mobility, pinning, and general tribological properties under shear stress are currently being understood and controlled, both experimentally and theoretically. Here, in this Colloquium simulated case studies of twisted graphene systems are used as a prototype workhorse tool to demonstrate and discuss the general picture of 2D material interface sliding. First highlighted is the crucial mechanical difference, often overlooked, between small and large incommensurabilities, which corresponds to, for example, small and large twist angles in graphene interfaces. In both cases, focusing on flat, structurally lubric or “superlubric” geometries, the generally separate scalings with the area of static friction in pinned states and of kinetic friction during sliding are elucidated and reviewed, tangled as they are with the effects of velocity, temperature, load, and defects. The roles of island boundaries and elasticity are also discussed, and compared when possible to results in the literature for systems other than graphene. It is proposed that the resulting picture of pinning and sliding should be applicable to interfaces in generic 2D materials that are of importance for the physics and technology of existing and future bilayer and multilayer systems.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States); Cornell Univ., Ithaca, NY (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0019064; SC0019481; SC0022106; SC0023113
OSTI ID:
2420931
Journal Information:
Reviews of Modern Physics, Journal Name: Reviews of Modern Physics Journal Issue: 1 Vol. 96; ISSN 0034-6861
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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