A lattice-dynamics model for the mixing of acoustic and optical modes in III-V compounds and its effect on the electron-phonon interaction

摘要: Abstract This paper addresses the phenomenon of mode-mixing in acoustic and optical branches vibrational modes III-V compounds, its effect on electron-phonon interaction. A description is given based analytic lattice-dynamics model long wavelengths diamond lattice valency force fields (VFF). known to give good results for elastic constants, it allows an account be optical-mode elasticity. versatility motivates presentation full here. Its application polar material introduces effects associated with difference atomic masses differences valence bonding, both which are source mixing towards short wavelengths. Short confinement nanostructures. It shown that interaction at extremely may become non-polar branches, but this likely small. more definitive conclusion awaits extension VFF