Harmonic lattice behavior of two-dimensional colloidal crystals
arXiv:cond-mat/0402444 · doi:10.1103/PhysRevLett.92.215504
Abstract
Using positional data from video-microscopy and applying the equipartition theorem for harmonic Hamiltonians, we determine the wave-vector-dependent normal mode spring constants of a two-dimensional colloidal model crystal and compare the measured band-structure to predictions of the harmonic lattice theory. We find good agreement for both the transversal and the longitudinal mode. For , the measured spring constants are consistent with the elastic moduli of the crystal.
4 pages, 3 figures, submitted
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