Diffusons, Locons, Propagons: Character of Atomic Vibrations in Amorphous Si

Details Diffusons, Locons, Propagons: Character of Atomic Vibrations in Amorphous Si Diffusons, Locons, Propagons: Character of Atomic Vibrations in Amorphous Si

1999-07-08

arxiv.org/abs/cond-mat/9907132v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

11 pages, 13 embedded figures. To be published in Phil. Mag. (Proceedings of the 1999 Andalo/Molveno Conference on Physics of

Scientific paper

10.1080/014186399255836

Numerical studies of amorphous silicon show that the lowest 4% of vibrational modes are plane-wave like ("propagons") and the highest 3% of modes are localized ("locons"). The rest are neither plane-wave like nor localized. We call them "diffusons." Since diffusons are by far the most numerous, we try to characterize them by calculating such properties as wavevector and polarization (which seem not to be useful), "phase quotient" (a measure of the change of vibrational phase on between first neighbor atoms), spatial polarization memory, and diffusivity. Localized states are characterized by finding decay lengths, inverse participation ratios, and coordination numbers of the atoms participating.

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