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- W1574665945 abstract "By using time resolved luminescence with polarized light we have studied spin relaxation in type II and type I GaAsAlGaAs quantum wells (QW's). The sample is, at 1.7 K, resonantly excited at the exciton transition with circularly polarized light and detection is on one of the two circularly polarized components in a direction perpendicular to the layers. In a type II QW the electrons are confined in the AlAs layer and the holes in the GaAs well. Therefore the optical transition is indirect and a long lifetime results. During the energy relaxation of the exciton we observe that the polarization is partially lost when a longitudinal magnetic field of 100 mT is applied. After the localization of the excitons the polarization ratio stays constant during the decay of the luminescence. This means a spin relaxation time longer than the lifetime of 7 μs. At zero magnetic field no polarization is observed. The long spin relaxation time for the type II QW is in contrast with the time obtained for the type I QW. In the latter case the polarization of the luminescence disappears at times shorter or equal than the instrumental response of 60 ps which is much shorter than the lifetime of about 200 ps. From the time integrated polarization ratio combined with the lifetime we estimate a spin relaxation time of 50 ps." @default.
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- W1574665945 date "1989-01-01" @default.
- W1574665945 modified "2023-09-27" @default.
- W1574665945 title "Spin relaxation in type I and II quantum wells" @default.
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- W1574665945 doi "https://doi.org/10.1016/0749-6036(89)90078-5" @default.
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