Estimation of effective mass and subbands in multi-quantum wells using polarized light irradiation

Nonparabolic nature of optical interband transitions of multi-quantum wells structure is important for related device designs. The optical interband transitions of In_0.53Ga_0.47As/In_0.52Al_0.48As MQWs including 20-nm-wide well clearly appeared on photocurrent spectra with polarized light source. The nonparabolic nature of conduction subbands was decided from experimental interband transitions. The electron effective mass smoothly increased from 0.041 m₀ to 0.07 m₀ in the conduction quantum well.