Recently, particular interest has been placed in the study of a strikingly counter-intuitive phenomenon: the clustering of purely repulsive soft particles. This contribution serves the purpose of both reviewing our current understanding of the multiple occupancy crystals and presenting details of recently developed tailor-cut approaches to the problem. We first indicate, by use of analytically tractable examples, how such a phenomenon can arise at all. We then show that the thermodynamic formalism has to be adapted when studying such systems and present a novel computer simulation technique apt to do so. Finally, we discuss the intriguing mechanical and structural responses of such systems upon increasing the density.
J. Phys.: Condens. Matter

Mladek, B. M, Charbonneau, P, Likos, C. N, Frenkel, D, & Kahl, G. (2008). Multiple occupancy crystals formed by purely repulsive soft particles. J. Phys.: Condens. Matter, 20(49, Article number: 494245), 1–9. doi:10.1088/0953-8984/20/49/494245