Phonon dispersion curves of two-dimensional colloidal crystals: on the wavelength dependence of friction

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dc.creatorBaumgartl, Joerg
dc.creatorDietrich, Julian
dc.creatorDobnikar, Jure
dc.creatorBechinger, Clemens
dc.creatorvon Gruenberg, Hans Hennig
dc.date2008-05-10
dc.date.accessioned2026-07-07T09:38:14Z
dc.date.available2026-07-07T09:38:14Z
dc.descriptionDigital video-microscopy measurements are reported of both elastic bandstructures and overdamped phonon decay times in two-dimensional colloidal crystals. Both quantities together allow to determine the friction coefficients along various high symmetry directions in q-space. These coefficients contain valuable information on the hydrodynamic forces acting between the colloidal particles. We find Stokes-like friction for phonons near the edge of the first Brillouin zone and vanishing friction coefficients for long wavelength phonons. The effect of this wavelength dependence in real-space is further investigated by simulating a crystal with constant friction (Langevin simulation) and comparing experimentally measured and simulated particle auto-correlation functions.
dc.description10 pages, 5 figures, 1 table, submitted to Soft Matter
dc.identifierhttps://arxiv.org/abs/0805.1472
dc.identifierhttp://arxiv.org/abs/0805.1472
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160735
dc.subjectOther Condensed Matter
dc.titlePhonon dispersion curves of two-dimensional colloidal crystals: on the wavelength dependence of friction
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