We developed a conical potential model for InGaAs/GaAs quantum dots formed in tetrahedral-shaped recesses (TSRs) and evaluated the diameter and average indium (In) content of TSR quantum dots by combining with magnetophotoluminescence (PL) measurements. The model calculations of the PL peak energy and its diamagnetic shift of TSR quantum dots were performed using the effective mass approximation method. We found that the diameter and the ratio of average In content of a TSR quantum dot to that of the surrounding quantum well are independent of the flow rate of trimethylindium, which is the source gas of In, in the range of our experiments. The negative diamagnetic shift of the PL peak from the first excited state transition, which was observed for the "In-rich" sample, could be explained by the contributions of two different energy levels with a different angular momentum.
ASJC Scopus subject areas
- General Physics and Astronomy