Low-energy modes and Debye behavior in a colloidal crystal

Antina Ghosh, Romain Mari, V.K. Chikkadi, Peter Schall, A.C. Maggs and Daniel Bonn

Physica A: Statistical Mechanics and its Applications, 2011, vol. 390, issue 18, 3061-3068

Abstract: We study the vibrational spectrum and the low-energy modes of a three-dimensional colloidal crystal using confocal microscopy. This is done in a two-dimensional cut through a three-dimensional crystal. We find that the observed density of states is incompatible with the standard Debye form in either two or three dimensions. These results are confirmed by numerical simulations. We show that an effective theory for the projections of the modes onto the two-dimensional cut describes the experimental and simulation data in a satisfactory way.

Keywords: Colloids; Phonons or vibrational states in low-dimensional structures and nanoscale materials; Lattice dynamics measurements (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:390:y:2011:i:18:p:3061-3068

DOI: 10.1016/j.physa.2011.02.051

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