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• W4207072166 abstract "Circularly polarized photoluminescence (PL) spectroscopy measured at 19 K on GaAs/AlGaAs symmetric and asymmetric double quantum wells (DQW) is reported. The PL is obtained by exciting the sample with a circularly polarized (left or right) laser in order to create an initial unbalanced distribution of electron spins in the conduction band and, in this way, obtain the electron spin lifetime $tau_s$. The effects of the excitation laser wavelength were estimated by exciting with laser wavelengths of 701.0 nm, 787.0 nm, 801.5 nm and 806.5 nm. The increase of $tau_s$ with the excitation wavelength is attributed to the lower initial quasi-momentum $bf{k}$ of the excited carriers, which also reduces spin-orbit relaxation processes. $tau_s$ was found to be higher in asymmetric DQWs: this is attributed to the wider QWs in these samples, which reduces spin relaxation due to the Dresselhaus mechanism. In addition, we also detected a smaller contribution from the Rashba mechanism by comparing samples with built-in electric fields of different orientations defined by doped barrier layers." @default.
• W4207072166 created "2022-01-26" @default.
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• W4207072166 date "2022-02-12" @default.
• W4207072166 modified "2023-10-17" @default.
• W4207072166 title "Photoluminescence of Double Quantum Wells: Asymmetry and Excitation Laser Wavelength Effects" @default.
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• W4207072166 doi "https://doi.org/10.1002/pssb.202100612" @default.
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