Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 29, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aa55a5
Keywords
colloids; quasicrystals; phasons; phonons
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Funding
- Deutsche Forschungsgemeinschaft (DFG) as part of the Research Unit Geometry and Physics of Spatial Random Systems [Me1361/12]
- DFG within the Emmy Noether programme [Schm2657/2]
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Phasons are additional degrees of freedom which occur in quasicrystals alongside the phonons known from conventional periodic crystals. The rearrangements of particles that are associated with a phason mode are hard to interpret in physical space. We reconstruct the quasicrystal structure by an embedding into extended higher-dimensional space, where phasons correspond to displacements perpendicular to the physical space. In dislocation-free decagonal colloidal quasicrystals annealed with Brownian dynamics simulations, we identify thermal phonon and phason modes. Finite phononic strain is pinned by phasonic excitations even after cooling down to zero temperature. For the phasonic displacements underlying the flip pattern, the reconstruction method gives an approximation within the limits of a multi-mode harmonic ansatz, and points to fundamental limitations of a harmonic picture for phasonic excitations in intrinsic colloidal quasicrystals.
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