Electron–hole transition energy for a spherical quantum dot confined in a nano-cylindrical wire

A single-band constant confining potential is applied to InAs spherical quantum dot confined in a GaAs cylindrical nano-wire to determine the electronic structure. The energy eigenvalues and transition energies are numerically calculated as a function of the dot radius. The calculations were performed within the effective mass approximation, using the finite element method. The effect of both spherical and cylindrical confinement, the size dependence of the ground and first excited state energies for electron and heavy hole and transition energies are reported and compared with experimental and theoretical results in relevant conditions.

Graphical abstractIn this paper the energy levels and transition energies have been calculated for a spherical QD placed at the center of a cylindrical nano-wire.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A spherical quantum dot is considered at the center of a nano-wire. ► Finite element method has been used to solve the Schrodinger equation. ► Energy levels decrease as dot radius increases. ► Transition energy is a decreasing function of dot radius.