Observation of Strongly Heterogeneous Dynamics at the Depinning Transition in a Colloidal Glass.
- Şenbil N Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
- Gruber M Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.
- Zhang C Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
- Fuchs M Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.
- Scheffold F Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
- 2019-04-02
Published in:
- Physical review letters. - 2019
English
We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual colloidal polystyrene probe particles seeded in an emulsion glass composed of droplets of the same size. Fluid and glass states can be probed. We monitor the trajectories of the probe and measure displacements and their distributions. Our experiments reveal intermittent dynamics around a depinning transition at a threshold force. For smaller forces, linear response connects mean displacement, and quiescent mean squared displacement. Mode coupling theory calculations rationalize the observations.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.122.108002
- PMID 30932679
- Persistent URL
- https://sonar.ch/global/documents/93885
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