title: Harmonic lattice behavior of two-dimensional colloidal crystals.
abstract: Using positional data from videomicroscopy 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 modes. For q-->0, the measured spring constants are consistent with the elastic moduli of the crystal.
authors.affiliation: Fachbereich Physik, Universität Konstanz, P.O.B. 5560, 78457 Konstanz, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Keim
authors.forename: G
authors.initials: G
authors.lastname: Maret
authors.forename: U
authors.initials: U
authors.lastname: Herz
authors.forename: H H
authors.initials: HH
authors.lastname: von Grünberg