Exciton-related optical properties in zinc-blende GaN/InGaN quantum wells under hydrostatic pressure

摘要

The exciton-related optical absorption in zinc-blende InGaN/GaN single quantum wells (QW) under hydrostatic pressure is studied. The energy states in the system are calculated within the effective mass approximation and a variational scheme, taking into account the effects of applied hydrostatic pressure an static electric field. The optical response is calculated in the framework of the two-level model and the rotating wave approximation. The results are given as functions of the In molar fraction, the QW width, the hydrostatic pressure, and the electric field strength. It is found that a significant excitonrelated nonlinear absorption can be achieved in the range of photon energies around 100 meV, for the kind of structures under study. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim