Physics – Condensed Matter – Materials Science
Scientific paper
2011-11-13
Isr. J. Chem. 51 (2011) 1156-1167
Physics
Condensed Matter
Materials Science
To appear in a special issue on quasicrystals of The Israel Journal of Chemistry, in celebration of the 2011 Nobel Prize in Ch
Scientific paper
10.1002/ijch.201100156
The discovery of quasicrystals has changed our view of some of the most basic notions related to the condensed state of matter. Before the age of quasicrystals, it was believed that crystals break the continuous translation and rotation symmetries of the liquid-phase into a discrete lattice of translations, and a finite group of rotations. Quasicrystals, on the other hand, possess no such symmetries-there are no translations, nor, in general, are there any rotations, leaving them invariant. Does this imply that no symmetry is left, or that the meaning of symmetry should be revised? We review this and other questions related to the liquid-to-crystal symmetry-breaking transition using the notion of indistinguishability. We characterize the order-parameter space, describe the different elementary excitations, phonons and phasons, and discuss the nature of dislocations-keeping in mind that we are now living in the age of quasicrystals.
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