Photoionization cross section of a D+ 2 complex in quantum dots: the role of donor atoms configuration
Date
2022Metadata
Show full item recordAbstract
This study reports a theoretical investigation on the electronic spectrum and the photoionization cross section of a singly
ionized double donor complex D+
2 confined in a two-dimensional quantum dot with Gaussian confinement potential. Using the
diagonalization method and the effective mass approach, the energy spectrum, binding energy, and photoionization cross section of
the D+
2 complex were obtained for different quantum dot sizes and internuclear distances. The numerical results obtained reveal that
the size of the geometric confinement and the configuration of the donor atoms significantly affect the binding energy, equilibrium
distance and photoionization cross section of the D+
2 complex. As a result, the electronic spectrum and optical responses of the
artificial molecule D+
2 complex can be fine-tuned simply by controlling the confinement size and impurity configuration. Also, we
conclude that a significant increase in the amplitude of the photoionization cross section is observed when the donor atoms are
symmetrically positioned on the x-axes. In addition, the exact convergence of the results obtained in the limiting case to the known
results demonstrated the suitability of the method used in this study.