Pressure-induced resonance broadening of exciton line shapes in semiconductors: Direct determination of intervalley scattering rates in GaAs
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We show that the exciton photoluminescence line shape in the GaAs/AlxGa1-xAs quantum wells under pressure is broadened by hybridization of the Γ exciton with the X and the L continua via electron-phonon coupling. Furthermore, we demonstrate the pressure tuning of the resonance-broadening effect which can be used to extract the electron-phonon coupling parameters directly. For GaAs we estimate the intervalley electron-phonon deformation potential DΓX to be 10.7±0.7 eV/Å. The resonance effect should be observable in other semiconductors as well.