One can think of colloids as model systems for solid state physics: Using microscopic particles whose interparticle interactions can be controlled in strength and range we study the atomic processes during crystallization, melting, or near the glass transition. We take advantage of the fact that colloidal particles can be observed on all relevant time- and length scales using simple tools such as light scattering and microscopy. This allows novel investigations of structural and dynamic properties with ''atomic'' resolution. In addition, the motions of these particles can be easily manipulated by light forces.
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