Volume 88, Number 6, December 2009
Article Number 66004
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 01 January 2010
EPL, 88 (2009) 66004
DOI: 10.1209/0295-5075/88/66004

Dynamics of particles and cages in an experimental 2D glass former

S. Mazoyer, F. Ebert, G. Maret and P. Keim

Fachbereich Physik, Universität Konstanz - Universitätsstrasse 10, 78457 Konstanz, Germany, EU

received 30 July 2009; accepted in final form 25 November 2009; published December 2009
published online 4 January 2010

We investigate the dynamics of a glass-forming 2D colloidal mixture and show the existence of collective motions of the particles. We introduce a mean square displacement MSD with respect to the nearest neighbors which shows remarkable deviations from the usual MSD quantifying the individual motion of our particles. Combined with the analysis of the self-part of the Van Hove function this indicates a coupled motion of particles with their cage as well as intra-cage hopping processes.

64.70.kj - Glasses.
68.90.+g - Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures.
82.70.-y - Disperse systems; complex fluids.

© EPLA 2009