Optical anisotropy and diamagnetic energy shifts in InP–GaP lateral quantum wells

Abstract

Linearly polarized photoluminescence (PL) measurements were made from InP–GaP lateral multiple quantum wells induced by composition modulation along the lateral direction. At B=0, two prominent emission peaks emerged, which are identified as transitions from In-rich well and Ga-rich barrier regions. Both transitions are strongly linear polarized parallel to the [110] crystal direction. While rotating PL orientation from [110] to [1–10] direction, the well and barrier transitions show red- and blue-shifts, respectively, due to the different valence states. In high magnetic fields, the two peaks exhibit different diamagnetic energy shifts mainly because of the effective-mass difference in the In-rich and Ga-rich alternate regions along the lateral direction.