title: Dynamic structure factors and Lyapunov modes in disordered chains.
abstract: We investigate various dynamic structure factors for harmonic and anharmonic chains. For harmonic chains with mass disorder we find some unexpected features, such as a fine structure contributing to a central peak, which is present also in the spatial spectra of the eigenfunctions. These results are contrasted with structure factors of Lyapunov modes obtained for the disordered Lennard-Jones chain. For this nonlinear system the static and the dynamic Lyapunov structure factors show opposite trends in their temperature dependence.
authors.affiliation: Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany.
authors.forename: Kai
authors.initials: K
authors.lastname: Helbig
authors.forename: Wolfram
authors.initials: W
authors.lastname: Just
authors.forename: Günter
authors.initials: G
authors.lastname: Radons
authors.forename: Hongliu
authors.initials: H
authors.lastname: Yang