An Exciton Bound to a Neutral Donor in Quantum Dots

Abstract

The binding energies for an exciton (X) trapped in a two-dimensionalquantum dot by a neutral donor have been calculated using the method offew-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 quantumdot has in general a larger binding energy than those in a two-dimensionalquantum well and a three-dimensional bulk semiconductor, and the bindingenergy increases with the decrease of the dot radius. At dot radius R→∞, we compare our calculated result with the previous results.