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Based on the effective-mass approximation, exciton states in wurtzite (WZ) and zinc-blende (ZB) InGaN/GaN coupled quantum dots (QDs) are studied by means of a variational method. Numerical results show clearly that both the sizes and In content of QDs have a significant influence on exciton states in WZ and ZB InGaN/GaN coupled QDs. Moreover, the ground-state exciton binding energy decreases when...
Within the framework of effective-mass approximation, we have calculated the binding energy of a hydrogenic donor impurity in a zinc-blende (ZB) GaN/AlGaN cylindrical quantum dot (QD) using a variational procedure. It is found that the donor binding energy is highly dependent on the impurity position and QD size. The donor binding energy Eb is largest when the impurity is located at the center of...
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