期刊
SCIENCE
卷 348, 期 6239, 页码 1115-1118出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1261422
关键词
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资金
- NSF [PHY-0551153]
- Canada's Natural Sciences and Engineering Research Council
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205554, 1125846] Funding Source: National Science Foundation
Friction between ordered, atomically smooth surfaces at the nanoscale (nanofriction) is often governed by stick-slip processes. To test long-standing atomistic models of such processes, we implemented a synthetic nanofriction interface between a laser-cooled Coulomb crystal of individually addressable ions as the moving object and a periodic light-field potential as the substrate. We show that stick-slip friction can be tuned from maximal to nearly frictionless via arrangement of the ions relative to the substrate. By varying the ion number, we also show that this strong dependence of friction on the structural mismatch, as predicted by many-particle models, already emerges at the level of two or three atoms. This model system enables a microscopic and systematic investigation of friction, potentially even into the quantum many-body regime.
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