Detection of phonon and phason modes in intrinsic colloidal quasicrystals by reconstructing their structure in hyperspace

Hielscher J, Martinsons M, Schmiedeberg M, Kapfer S (2017)


Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Publisher: IOP PUBLISHING LTD

Book Volume: 29

Journal Issue: 9

DOI: 10.1088/1361-648X/aa55a5

Abstract

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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How to cite

APA:

Hielscher, J., Martinsons, M., Schmiedeberg, M., & Kapfer, S. (2017). Detection of phonon and phason modes in intrinsic colloidal quasicrystals by reconstructing their structure in hyperspace. Journal of Physics: Condensed Matter, 29(9). https://doi.org/10.1088/1361-648X/aa55a5

MLA:

Hielscher, Johannes, et al. "Detection of phonon and phason modes in intrinsic colloidal quasicrystals by reconstructing their structure in hyperspace." Journal of Physics: Condensed Matter 29.9 (2017).

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