Energy spectrum and optical properties of $D^{-}$− centers in structures with quantum disks

The impurity absorption of light in a quasi-zero-dimensional structure with disk-like quantum dots is theoretically investigated using the zero-range potential model. It is shown that the singularity of the geometric and potential confinement of a quantum disk manifests itself in spatial anisotropy of the coupling energy of the $D^{-}$ − state and in a significant dependence of the impurity absorption edge on the characteristic dimensions of disk-like quantum dots.