We studied experimentally the influence of the size of GaN quantum dots on the exciton photoluminescence at 10 K under high optical excitation for which the spatial confinement was found to be a critical parameter for optical nonlinearities such as band-gap renormalization (BGR) and state-filling effects. As the dot size decreases, the BGR characteristic of bulk like dots becomes dominated by the state-filling nonlinearity. In addition, three-dimensional confinement is demonstrated by a comparison with a quantum well.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry