Abstract:

This talk consists of the following two parts of experimental work on spin related phenomena in some III-V quantum wells.
The first part is to demonstrate the spin driven photocurrent in a InGaAs/InAlAs two dimensional electron gas system by using the spin-orbit coupling. Conversely, the current will also induce in-plane spin polarization perpendicular to the current, which can be measured by Kerr rotation.
The second part is about the spin relaxation process in InAs/GaAs quantum wells and GaAsN/GaAs quantum wells. Significant enhancement of the spin lifetime in InAs submonolayer will be shown, which is interpreted as the suppressed DP spin relaxation process due to the lateral constriction. The spin lifetime in GaAsN/GaAs quantum wells will be systematically shown with the well width dependence, the nitrogen composition dependence, the pumping density dependence and the temperature dependence.
 
 
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