Spatially modulated photoluminescence properties in dynamically strained GaAs/AIAs quantum wells by surface acoustic wave

摘要

Spatially resolved photoluminescence (PL) spectra and polarization anisotropy were investigated in GaAs/AIAs dynamic wires, which were formed by applying a surface acoustic wave(SAW) on GaAs/ AlAs quantum wells along the [110] or [1-10] direction. A synchronized excitation method clearly demonstrates that the band gap energies are spatially modulated by the travelling-SAW-induced strain. It is found that both the spatial PL modulation and anisotropic polarization properties depend on the SAW direction. The spatial modulation of the polarization anisotropies and their dependence on the strain-induced valence band mixing are also discussed theoretically.