The intricate relaxation dynamics in compressively strained Ge quantum wells with Ge-rich SiGe barriers is investigated systematically for various excitation conditions. Evidence of efficient ultrafast intersubband relaxation in competition with the intrasubband electron cooling is found in continuous wave photoluminescence spectra measured with different excitation wavelengths. These findings are corroborated by time-resolved pumpprobe absorption measurements yielding an intersubband relaxation time in the range of 100 fs.
Gatti, E., Grilli, E., Guzzi, M., Chrastina, D., Isella, G., Chernikov, A., et al. (2011). Photoluminescence and ultrafast inter-subband relaxation in Ge/SiGe multiple quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 84(24), 245319 [10.1103/PhysRevB.84.245319].
Photoluminescence and ultrafast inter-subband relaxation in Ge/SiGe multiple quantum wells
GATTI, ELEONORA;GRILLI, EMANUELE ENRICO;GUZZI, MARIO;
2011
Abstract
The intricate relaxation dynamics in compressively strained Ge quantum wells with Ge-rich SiGe barriers is investigated systematically for various excitation conditions. Evidence of efficient ultrafast intersubband relaxation in competition with the intrasubband electron cooling is found in continuous wave photoluminescence spectra measured with different excitation wavelengths. These findings are corroborated by time-resolved pumpprobe absorption measurements yielding an intersubband relaxation time in the range of 100 fs.
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