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Fig. 1. (Color) (a) Sample structure of multiple quantum wells, where r=0.75 and s=0.82, and 5× signifies the growth repetition. The average aluminum concentrations of the quantum wells and barriers are _w and _b, respectively. (b) Photoluminescence spectra at room temperature. The vertical arrows indicate the positions of the calculated effective band gaps. The intensity of the PL spectra for samples C and D is scaled for clarity. First citation in article

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Fig. 2. (Color) Time-resolved Kerr rotation of sample A at room temperature for (a) B=0  T and (b) B=0.6  T and sample D for (c) B=0  T and (d) B=0.6  T. Offset is subtracted for clarity. The circles are measurements and lines are fits using the expression for (t). First citation in article

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Fig. 3. (Color) (a) Electron spin coherence time T and (b) spin precession frequency _L as a function of magnetic field B at room temperature. The corresponding lines are linear fits. First citation in article

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Fig. 4. (Color) Electron effective g-factor g^* (a), electron spin coherence time T for B=0.6  T (b), and calculated T₂ (c) as a function of _w. The red crosses represent the calculated T₂ assuming µ=2000  cm²/V  s. n is the electron density used in the calculations. The line is a guide for the eyes. First citation in article