Experimental observation of Shapiro-steps in colloidal monolayers driven across time-dependent substrate potentials

Brazda, Thorsten; July, Christoph; Bechinger, Clemens

Experimental observation of Shapiro-steps in colloidal monolayers driven across time-dependent substrate potentials

Dateien

Brazda_0-410698.pdf(261.58 KB)

Datum

2017

Autor:innen

Brazda, Thorsten

July, Christoph

Bechinger, Clemens

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Soft matter ; 13 (2017), 22. - S. 4024-4028. - eISSN 1744-6848

Zusammenfassung

We experimentally study the motion of a colloidal monolayer which is driven across a commensurate substrate potential whose amplitude is periodically modulated in time. In addition to a significant reduction of the static friction force compared to an unmodulated substrate, we observe a Shapiro step structure in the force dependence of the mean particle velocity which is explained by the dynamical mode locking between the particle motion and the substrate modulation. In this regime, the entire crystal moves in a stick-slip fashion similar to what is observed when a single point contact is driven across a periodic surface. Contrary to numerical simulations, where typically a large number of Shapiro steps is found, only a single step is observed in our experiments. This is explained by the formation of kinks which weaken the synchronization between adjacent particles.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

BRAZDA, Thorsten, Christoph JULY, Clemens BECHINGER, 2017. Experimental observation of Shapiro-steps in colloidal monolayers driven across time-dependent substrate potentials. In: Soft matter. 13(22), pp. 4024-4028. eISSN 1744-6848. Available under: doi: 10.1039/c7sm00393e

BibTex

@article{Brazda2017-06-07Exper-39231,
  year={2017},
  doi={10.1039/c7sm00393e},
  title={Experimental observation of Shapiro-steps in colloidal monolayers driven across time-dependent substrate potentials},
  number={22},
  volume={13},
  journal={Soft matter},
  pages={4024--4028},
  author={Brazda, Thorsten and July, Christoph and Bechinger, Clemens}
}

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