On- and off-center helium atom in a spherical multilayer quantum dot with parabolic confinement

The ground state energy of a helium atom inside a spherical multilayer quantum dot as a function of the atomic impurity location inside the quantum dot has been calculated. The multilayer quantum dot is modeled by a core/shell/well/shell structure using a parabolic confinement. The Configuration Interaction method and the Diffusion Monte Carlo have been used to solve the Schrodinger equation. Results obtained showed that the lowest energy configuration depends on the size of the different layers of the quantum dot and agreement between Configuration Interaction and Diffusion Monte Carlo results indicates that the Configuration Interaction approach used here would be suitable to compute excited states of this system.

Automated summary

The ground state energy of a helium atom in a spherical multilayer quantum dot was calculated. The energy depended on the impurity location inside the quantum dot. A core/shell/well/shell structure with a parabolic confinement was used to model the multilayer quantum dot. The Configuration Interaction method and Diffusion Monte Carlo were employed to solve the Schrodinger equation. The results showed that the lowest energy configuration varied with the size of the different layers, and the agreement between Configuration Interaction and Diffusion Monte Carlo results suggested the suitability of the Configuration Interaction approach for computing excited states.