期刊
PHYSICAL REVIEW B
卷 93, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.121402
关键词
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资金
- National Science Foundation [DMR-1411144]
- Deutsche Forschungsgemeinschaft [PA 2023/2]
- Julich Supercomputing Center [hfr13]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1411144] Funding Source: National Science Foundation
Geometrically imposed force cancellations lead to ultralow friction between rigid incommensurate crystalline asperities. Elastic deformations may avert this cancellation but are difficult to treat analytically in finite and three-dimensional systems. We use atomic-scale simulations to show that elasticity affects the friction only after the contact radius a exceeds a characteristic length set by the core width of interfacial dislocations b(core). As a increases past b(core), the frictional stress for both incommensurate and commensurate surfaces decreases to a constant value. This plateau corresponds to a Peierls stress that drops exponentially with increasing b(core) but remains finite.
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