quantum wells

We measured the electron spin relaxation time τs in n-modulation doped GaAs/AlGaAs (110) multiple quantum wells by pump probe method. The value of τs exceeds View the MathML source even at room temperature, which is two orders of magnitude longer than that in (001) GaAs quantum wells. The τs dependence on quantized-electron energy, pump beam power and temperature can qualitatively be explained by the reduction of the electron-hole exchange interaction due to screening.