We formulate the exciton equations in k-space for thin AlGaAs/AlAs/AlGaAs under external electric field. Our model includes both Γ-X valley mixing and multi-band Coulomb interaction. The system is chosen to have a Γ level and an X level nearly degenerate under zero field. The electric field induces a type-I to type-II transition. In this work, we study the excitonic structures and calculate the absorption spectra for this asymmetrical quantum well under various field strengths.
All Science Journal Classification (ASJC) codes
- 化學 (全部)