Raman Spectra in AlxGa1-xAs under High Pressure

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  • Raman Spectra in Al<I><SUB>x</SUB></I>Ga<SUB>1−<I>x</I></SUB>As under High Pressure
  • Raman Spectra in AlxGa1-xAs under High
  • Raman Spectra in Al<sub><i>x</i></sub>Ga<sub>1-<i>x</i></sub>As under High Pressure

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Raman spectra have been measured in AlxGa1−xAs as a function of alloy composition and pressure. The Raman spectra are interpreted as a 2-mode behavior (persistence type) for LO and TO phonons and a 1-mode behavior (amalgamation type) for LA and TA phonons as being theoretically predicted. With increasing x, the AlAs-like LO and TO modes shift to higher frequencies and GaAs-like modes shift to lower frequencies. Under high pressure these modes shift to the higher frequencies. We analyze the Raman spectra of TO modes as the disorder activated lines from the whole Brillouin zone. The low energy structures are assigned to the disorder activated TA and LA modes by the pressure dependences of their energies and by their line shape. The spectral assignments of these modes in AlxGa1−xAs are consistent with their composition dependence.

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