Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2004-09-09
Physics
Condensed Matter
Disordered Systems and Neural Networks
4 pages; 3 figures; based on poster presentation for "Phonons 2004" conference
Scientific paper
Force-constant and positional disorder have been introduced into diamond lattice models in an attempt to mimic the vibrational properties of a realistic amorphous silicon model. Neither type of disorder is sufficient on its own to mimic the realistic model. By comparing the spectral densities of these models, it is shown that a combination of both disorders is a better representation, but still not completely satisfactory. Topological disorder in these models was investigated by renumbering the atoms and examining the dynamical matrix graphically. The dynamical matrix of the realistic model is similar to that of a positionally-disordered lattice model, implying that the short-range order in both systems is similar.
Christie J. K.
Elliott Steven R.
Taraskin Sergei N.
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