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The effects of an externally applied one-dimensional periodic potential onthe freezing/melting behaviour of two-dimensional systems of colloidalparticles with a short-range attractive interaction are studied using MonteCarlo simulations. In such systems, incommensuration results when theperiodicity of the external potential does not match the length-scale at whichthe minimum of the attractive potential occurs. To study the effects of thisincommensuration, we consider two different models for the system. Oursimulations for both these models show the phenomenon of reentrant freezing asthe strength of the periodic potential is varied. Our simulations also showthat different exotic phases can form when the strength of the periodicpotential is high, depending on the length-scale at which the minimum of theattractive pair-potential occurs.Comment: 24 pages (including figures) in preprint forma

Laser-induced reentrant freezing in two-dimensional attractive colloidal systems