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Why Sliding Friction of Ne and Kr Monolayers Is So Different on the Pb(111) Surface

Y. N. Zhang ; F. Hanke ; V. Bortolani ; Mats Persson (Institutionen för teknisk fysik, Material- och ytteori) ; R. Q. Wu
Physical Review Letters (0031-9007). Vol. 106 (2011), 23,
[Artikel, refereegranskad vetenskaplig]

To understand the tribological properties of Ne and Kr on Pb(111), the potential energy surfaces for sliding motion of Ne, Kr, and Xe monolayers on the Pb(111) surface are examined through density functional calculations, using either local density or self-consistent nonlocal van der Waals functionals. The calculated adsorption energy for Xe/Pb(111) agrees well with experiment, validating the present approach and parameters. Activation energies along a sliding path indicate that Ne motion is much faster than Kr and Xe on Pb(111) at T similar to 6 K, which explains the puzzling experimental observation.

Nyckelord: atomic-scale friction, nanotribology

Denna post skapades 2011-07-04. Senast ändrad 2011-07-04.
CPL Pubid: 142998


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