Experimental realization of a model glass former in 2D.
We have studied binary two-dimensional (2D) mixtures of superparamagnetic colloidal particles interacting through magnetic dipole moments, which were induced by an external magnetic field B. By tuning B the effective system temperature could be widely adjusted. Time-dependent particle coordinates measured by video-microscopy provide radial pair-distribution functions, mean-square displacements as well as evidence for heterogeneous dynamics. Characteristic features of 3D glass formers are observed experimentally in 2D for the first time.
König
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Department of Physics, University of Konstanz, 78457, Konstanz, Germany. koenigh@uni-mainz.de
Hund
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R
Zahn
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Maret
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