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