Figure 4.

Photo-excited carrier density dependence of electron spin relaxation times measured at 10 K with excitation wavelength of 798 nm. (a) The typical time-resolved Kerr rotation signals measured at three different pumping electron densities for the asymmetric GaAs QW. (b) Photo-excited carrier density dependence of electron spin relaxation times measured for both symmetric and asymmetric GaAs QW samples. The solid lines are drawn to guide eyes.

Han et al. Nanoscale Research Letters 2011 6:84   doi:10.1186/1556-276X-6-84
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