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Direct observation of picosecond spin relaxation of excitons in GaAs/AlGaAs quantum wells using spin‐dependent optical nonlinearity

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4 Author(s)
Tackeuchi, Atsushi ; Fujitsu Laboratories Ltd., 10‐1 Morinosato‐Wakamiya, Atsugi, Kanagawa 243‐01, Japan ; Muto, Shunichi ; Inata, Tsuguo ; Fujii, Toshio

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We have directly observed spin relaxation of excitons in the picosecond region using time‐resolved polarization absorption measurements. With the help of spin‐dependent optical nonlinearity of excitonic absorption, we obtained a fast decay of spin‐up carriers and a fast accumulation of spin‐down carriers with a spin relaxation time of 32 ps for a GaAs/Al0.51Ga0.49As multiple quantum well at room temperature with a time resolution of 1 ps.

Published in:

Applied Physics Letters  (Volume:56 ,  Issue: 22 )