An Exciton Bound to a Neutral Donor in Quantum Dots

The binding energies for an exciton (X) trapped in a two-dimensional quantum dot by a neutral donor have been calculated by using the method of few-body physics for the heavy hole (σ = 0.196) and the light hole (σ =0.707). We find that the (D⁰,X) complex confined in a quantum dot has in general a larger binding energy than those in a two-dimensional quantum well and a three-dimensional bulk semiconductor, and the binding energy increases with decrease of the dot radius. At dot radius R → ∞, we compare our calculated result with the previous results.