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Dynamic phases of colloidal monolayers sliding on commensurate substrates

Autor(en)
Jaffar Hasnain, Swetlana Jungblut, Christoph Dellago
Abstrakt

We report on numerical simulations of a monolayer of charge-stabilized colloids driven over a substrate potential by an external dc force acting along a symmetry axis of the monolayer. Using overdamped Langevin dynamics, we studied the sliding transition for various inter-particle interaction strengths as a function of the driving force. For weak interactions, the diffusion of individual defects is responsible for the motion of the monolayer. As the interaction strength is increased, sliding is induced by distinct density compression and decompression zones. For very strong interactions, a type of stick-slip mechanism emerges, in which the sliding of the monolayer is mediated by the propagation of collective distortion waves. Our predictions can be tested experimentally with two-dimensional arrangements of colloidal particles exposed to periodic light fields and our work shows that the inter-particle interaction strength tunes the degree of correlation in the sliding mechanism adopted by a monolayer driven over a commensurate substrate.

Organisation(en)
Computergestützte Physik und Physik der Weichen Materie
Journal
Soft Matter
Band
9
Seiten
5867-5873
Anzahl der Seiten
7
ISSN
1744-683X
DOI
https://doi.org/10.1039/c3sm50458a
Publikationsdatum
2013
Peer-reviewed
Ja
ÖFOS 2012
103036 Theoretische Physik, 103015 Kondensierte Materie, 103029 Statistische Physik
Schlagwörter
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/4a3434f8-4c66-4302-8cca-f2cab7b78fe3