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Phonon spectra of strained Si and Ge.

Phonon spectra of Si and Ge grown pseudomorphically on [001]-oriented Si 1-x Ge x substrates are studied theoretically. In the case of Si or Ge grown on a [001]-oriented substrate, the frequency shift induced by the biaxial strain for the LO-phonon mode is found to be nearly rigid along the [001] direction, whereas for the TO-phonon mode the frequency shift is wave-vector dependent. Frequency shifts of the LA- and TA-phonon modes also show a wave-vector dependence