Domaines
Statistical physics
Soft matter
Type of internship
Théorique, numérique Description
Quasicrystals are exotic aperiodic structures, that can exhibit symmetries forbidden by the normal rules of crystallography. While typically found in metallic alloys, over the past decades a number of soft-matter systems – both experimental and simulated – have been developed that are capable of forming quasicrystal phases.
In most cases, these self-assembled quasicrystal can be interpreted as being constructed out of a limited set of tiles, such as squares and triangles in 2D, that are mixed together to produce an aperiodic pattern. Interestingly, there are usually many ways these tilings can be rearranged in order to form similar patterns. This degeneracy leads to a so-called configurational entropy contribution to the free energy of the quasicrystal, which helps stabilize the quasicrystal phase. In some of our past work [1], we have examined the free energy of quasicrystal tilings in a simple model system, in order to map out the phase diagram. Interestingly, in that model system, it turned out that all different variations of the same quasicrystal tiling provided essentially the same contribution to the free energy. While this greatly simplified our calculations, this is likely not a typical case.
In this project, you will explore methods to predict how likely a given quasicrystalline tiling is in a model system consisting of two-dimensional patchy particles.
Contact
Frank Smallenburg