Quantum-Confinement Effects on Binding Energies and OpticalProperties of Excitons in Quantum Dots

Abstract

Quantum-confinement effects on the binding energy and the linearoptical susceptibility of excitons in quantum dots arestudied. It is found that the binding energy and the linearoptical susceptibility are sensitive to the barrier height andthe dot size. For an infinite barrier, the binding energy ofexcitons decreases monotonically with the increasing dot radius, andthe absorption intensity has almost the same amplitude withthe increasing photon energy. For a finite barrier, the bindingenergy has a maximum value with the increasing dot radius, and theabsorption intensity damps rapidly with the increasing photon energy.The effective mass ratio is also found to have an influence onthe binding energy. The results could be confirmed by futureexperiments on excitons in quantum dots.