Abstract
The optical properties of CdTe/ZnTe self-assembled quantum rings as functions of the height and inner diameter are investigated with a finite element method based on the linear elasticity theory of solids and the eight-band k·p Hamiltonian. We find that the quantum ring height significantly alters the bi-axial strain, while it has less effect on the hydrostatic strain. It was shown that the interband transition energy increases with increasing inner diameter (or decreasing quantum ring volume), while it decreases as the height increases. We find that the matrix element for the x-polarization is much larger than that of the z-polarization, in contrast to the result of the truncated quantum dot heterostructure. It is found that the gain peak is redshifted as the height of quantum ring increases, while it is blueshifted with increasing intensity as the inner diameter of quantum ring increases.
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