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- W2014994166 abstract "We present a first-principles pseudopotential study of the effects of the (001) biaxial strain on the transverse phonon spectra of Si and Ge along the $ensuremath{Delta}$ direction, and of the transverse phonon modes of strained Si/Ge (001) superlattices (SL's). The supercell method is used to calculate the [001] transverse interplanar force constants (IPFC's) of Si and Ge at three strain configurations corresponding to coherent growth on ${mathrm{Si}}_{1ensuremath{-}x}{mathrm{Ge}}_{x}$ (001) (with $x=0, 0.5, mathrm{and} 1$) substrates. IPFC's up to the eighth-nearest-neighboring planes were included. It has been found that (i) the strain-induced frequency shift of the transverse optical (TO) branch is in excellent agreement with the available experimental data and has a weak wave vector dependence. (ii) Both the Si- and Ge-like TO confined modes in strained Si/Ge (001) SL's are well described relative to the bulk dispersions by an effective confinement length ${d}_{mathrm{eff}}=(n+3)frac{{a}_{ensuremath{perp}}}{4}$, where $n$ is the number of monolayers of Si or Ge, and $frac{{a}_{ensuremath{perp}}}{4}$ is the corresponding interplanar distance. (iii) The frequencies of the interface modes are about 400 ${mathrm{cm}}^{ensuremath{-}1}$ and have a strong dependence on the interfaces coupling in short period SL's." @default.
- W2014994166 created "2016-06-24" @default.
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- W2014994166 date "1996-03-01" @default.
- W2014994166 modified "2023-09-26" @default.
- W2014994166 title "Transverse interplanar forces and phonon spectra of strained Si, Ge, and Si/Ge superlattices" @default.
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- W2014994166 doi "https://doi.org/10.1103/physrevb.53.5372" @default.
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