LAYERING TRANSITIONS IN A GAUSSIAN-CORE MODEL UNDER GEOMETRICAL CONFINEMENT

摘要

The order-disorder transition of a Gaussian-core model confined between parallel walls was investigated by a Monte Carlo simulation. When the density of the system is changed, the system shows successive layering transitions. It was also confirmed that there are ordered structures with a square lattice symmetry and with hexagonal lattice symmetry in the direction parallel to the walls. Such positional order remains beyond the critical temperature Tc~(3d),at which ordered states disappear at all densities in a three-dimensional system without confinement. Different from hard-sphere suspensions, the positional order of this model remains relatively stable, despite the polydis-persity of the system.