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Observation of strongly heterogeneous dynamics at the depinning transition in a colloidal glass

  • Şenbil, Nesrin Department of Physics, University of Fribourg, Switzerland
  • Gruber, Markus Fachbereich Physik, Universität Konstanz, Germany
  • Zhang, Chi Department of Physics, University of Fribourg, Switzerland
  • Fuchs, Matthias Fachbereich Physik, Universität Konstanz, Germany
  • Scheffold, Frank Department of Physics, University of Fribourg, Switzerland
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    13.03.2019
Published in:
  • Physical Review Letters. - 2019, vol. 122, no. 10, p. 108002
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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307837
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