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

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Details zur Publikation

Autorinnen und Autoren: Hielscher J, Martinsons M, Schmiedeberg M, Kapfer S
Zeitschrift: Journal of Physics: Condensed Matter
Verlag: IOP PUBLISHING LTD
Jahr der Veröffentlichung: 2017
Band: 29
Heftnummer: 9
ISSN: 0953-8984
eISSN: 1361-648X


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Hielscher, Johannes
Lehrstuhl für Theoretische Physik
Kapfer, Sebastian
Lehrstuhl für Theoretische Physik
Martinsons, Miriam
Professur für Theoretische Physik
Schmiedeberg, Michael Prof. Dr.
Professur für Theoretische Physik


Zitierweisen

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://dx.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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Zuletzt aktualisiert 2018-14-07 um 15:23