Negative Friction Coefficients in Superlubric Graphite-Hexagonal Boron Nitride Heterojunctions

Autor:	Mandelli, Davide, Ouyang, Wengen, Hod, Oded, Urbakh, Michael
Rok vydání:	2019
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 122, 076102 (2019)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.122.076102
Popis:	Negative friction coefficients, where friction is reduced upon increasing normal load, are predicted for superlubric graphite-hexagonal boron nitride heterojunctions. The origin of this counterintuitive behavior lies in the load-induced suppression of the moir\'e superstructure out-of-plane distortions leading to a less dissipative interfacial dynamics. Thermally induced enhancement of the out-of-plane fluctuations leads to an unusual increase of friction with temperature. The highlighted frictional mechanism is of a general nature and is expected to appear in many layered material heterojunctions. Comment: 34 pages, 16 figures, (file includes Supplemental Material)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1902.08067 Zobrazit plný text záznamu View this record from Arxiv