Dynamical phases of attractive particles sliding on a structured surface

Inspired by experiments on quartz crystal microbalance setups, we study the mobility of a monolayer of Lennard-Jones particles driven over a hexagonal external potential. We pay special attention to the changes in the dynamical phases that arise when the lattice constant of the external substrate po...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2015-05, Vol.27 (19), p.194122-194122
Main Authors: Hasnain, J, Jungblut, S, Dellago, C
Format: Article
Language:English
Subjects:
colloidal monolayer
computer simulations
friction
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Summary:Inspired by experiments on quartz crystal microbalance setups, we study the mobility of a monolayer of Lennard-Jones particles driven over a hexagonal external potential. We pay special attention to the changes in the dynamical phases that arise when the lattice constant of the external substrate potential and the Lennard-Jones interaction are mismatched. We find that if the average particle separation is such that the particles repel each other, or interact harmonically, the qualitative behavior of the system is akin to that of a monolayer of purely repulsive Yukawa particles. On the other hand, if the particles typically attract each other, the ensuing dynamical states are determined entirely by the relative strength of the Lennard-Jones interaction with respect to that of the external potential.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/27/19/194122