Zero temperature phase diagram of the square-shoulder system

Details Zero temperature phase diagram of the square-shoulder system Zero temperature phase diagram of the square-shoulder system

2008-08-05

arxiv.org/abs/0808.0687v1

Physics

Condensed Matter

Soft Condensed Matter

Submitted to J. Chem. Phys

Scientific paper

10.1063/1.3006065

Particles that interact via a square-shoulder potential, consisting of an impenetrable hard core with an adjacent, repulsive, step-like corona, are able to self-organize in a surprisingly rich variety of rather unconventional ordered structures. Using optimization strategies that are based on ideas of genetic algorithms we encounter, as we systematically increase the pressure, the following archetypes of aggregates: low-symmetry cluster and columnar phases, followed by lamellar particle arrangements, until at high pressure values compact, high-symmetry lattices emerge. These structures are characterized in the NPT ensemble as configurations of minimum Gibbs free energy. Based on simple considerations, i.e., basically minimizing the number of overlapping coronae while maximizing at the same time the density, the sequence of emerging structures can easily be understood.

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