Electron spin dynamics in InGaAs quantum wells

Electron spin dynamics in strained <f>In0.1Ga0.9As/Al0.4Ga0.6</f>As quantum wells (QWs) on <f>(1 0 0)</f> and <f>(1 1 0)</f>-oriented substrates are investigated by time-resolved Faraday rotation. We find that the spin relaxation time in <f>(1 1 0)</f> QWs is 6 times longer than that in <f>(1 0 0)</f> QWs at low temperatures, which is strongly reduced by applying magnetic fields. The sign of <f>g</f>-factor is found positive and its magnitude decreases with increasing well width, in the well width range investigated here. [Copyright &y& Elsevier]