2004/04/23 by M. Mikulis, Michael C. Mikulis, C. J. Olson Reichhardt +4 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Electrostatics and Colloid Interactions #Material Dynamics and Properties #Spectroscopy and Quantum Chemical Studies #cond-mat.soft
paper · pdf · doi:10.1088/0953-8984/16/45/013
published as J. Phys.: Condens. Matter 16, 7909 (2004) · 9 pages, 7 postscript figures
arxiv created 2004/04/23 · openalex publication_date 2004/10/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Using numerical simulations, we study colloidal ordering and disordering on two-dimensional periodic substrates where the number of colloids per substrate minima is two or three. The colloids form dimer or trimer states with orientational ordering, referred to as colloidal molecular crystals. At a fixed temperature such that, in the absence of a substrate, the colloids are in a triangular floating solid state, upon increasing the substrate strength we find a transition to an ordered colloidal molecular crystal state, followed by a transition to a disordered state where the colloids still form dimers or trimers but the orientational order is lost. These results are in agreement with recent experiments.