Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure

The effect of a magnetic field on the excitonic and optical properties of an InP/ZnS core/shell nanodot (type I) including the influence of the geometrical confinement effect has been investigated. The exciton binding energy, oscillator strength, linear and nonlinear electronic and optical absorption coefficients, electronic dipole moment, and optical gain are studied for different ratios of the core/shell dot radii with and without the application of a magnetic field. The variational formalism is employed to obtain the electronic properties, whereas a compact density matrix method is applied to determine the optical properties. It is observed that the exciton binding energy is enhanced as the core/shell ratio tends to unity, attempting to reach its well-known two-dimensional (2D) limit. The application of a magnetic field shifts the peak to higher energies. The combined effects of a magnetic field and spatial confinement lead to control over the electronic as well as optical properties. These results will be useful for enhancing the performance of such structures for any desired potential application in optical devices.