Vibrational behaviour of a realistic amorphous-silicon model

Details Vibrational behaviour of a realistic amorphous-silicon model Vibrational behaviour of a realistic amorphous-silicon model

2007-01-09

arxiv.org/abs/cond-mat/0701170v1

Physics

Condensed Matter

Materials Science

18 pages, 11 figures, uses Elsevier file 'elsart.cls', submitted to J. Non-Cryst. Solids

Scientific paper

10.1016/j.jnoncrysol.2007.02.039

The vibrational properties of a high-quality realistic model of amorphous silicon are examined. The longitudinal and transverse dynamical structure factors are calculated, and fitted to a damped harmonic oscillator (DHO) function. The width $\Gamma$ of the best-fit DHO to the longitudinal dynamical structure factor scales approximately as $k^{2}$ for wavevectors $k\lesssim0.55\textrm{\AA}^{-1}$, which is above the Ioffe-Regel crossover frequency separating the propagating and diffusing regimes, occurring at $k=0.38\pm0.03\textrm{\AA}^{-1}$. Using the DHO function as a fitting function for the transverse dynamical structure factor (without theoretical justification), gives a dependence of $\Gamma\propto k^{\alpha}$ with $\alpha\sim2.5$ for wavevectors $k\lesssim0.7\textrm{\AA}^{-1}$. There was no evidence for $\Gamma\propto k^{4}$ behaviour for either polarization.

Affiliated with

Also associated with

No associations

Rating

Vibrational behaviour of a realistic amorphous-silicon model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Vibrational behaviour of a realistic amorphous-silicon model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibrational behaviour of a realistic amorphous-silicon model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-722720