Raman Spectra in Al_xGa_<1-x>As under High Pressure

概要

論文の詳細を見る
Raman spectra have been measured in A1.Ga. .As as a function of alloy composition and pressure. The Raman spectra are interpreted as a 2-mode behavior (per-sistence 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, theAIAs-like LO and TO modes shift to higher frequencies and GaAs-like modes shift tolower 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 thewhole Brillouin zone. The low energy structures are assigned to the disorder activatedTA and LA modes by the pressure dependences of their energies and by their lineshape. The spectral assignments of these modes in Al.Ga. .As are consistent withtheir composition dependence.
社団法人日本物理学会の論文
1987-03-15