Dynamic structure factors and Lyapunov modes in disordered chains.
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.
Helbig
Kai
K
Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany.
Just
Wolfram
W
Radons
Günter
G
Yang
Hongliu
H