Self-organized quantum disks for a two-state system

We mainly discuss the self-organization in a strained InGaAs/AlGaAs system on a GaAs(311)B surface. This self-organizing growth mode in metal–organic–vapor phase epitaxy automatically produces very small confined nanostructure of quantum disks during growth interruption under a high growth temperature. The micro-photoluminescence (micro-PL) and PL excitation spectroscopies exhibit very narrow excitonic emission and absorption lines. These results indicate that the self-organized quantum disk is a zero-dimensional nanostructure and discrete excitonic states in the zero-dimensional disk may be applicable to a two-state quantum system.