g-Factors and diamagnetic coefficients of electrons, holes and excitons in InAs/InP quantum dots

TL;DR

This study calculates electron, hole, and exciton g-factors and diamagnetic coefficients in InAs/InP quantum dots using envelope-function theory, revealing their dependence on quantum dot properties and comparing well with experimental data.

Contribution

It provides a detailed theoretical analysis of g-factors and diamagnetic coefficients in quantum dots, including the effects of Coulomb interaction and remote-band contributions.

Findings

Electron g-factor linked to valence envelope functions with non-zero orbital momentum.

Exciton diamagnetic coefficients depend on quantum dot height and effective mass.

Theoretical results align with experimental data, especially when Coulomb interaction is included.

Abstract

The electron, hole, and exciton g-factors and diamagnetic coefficients have been calculated using envelope-function theory for cylindrical InAs/InP quantum dots in the presence of a magnetic field parallel to the dot symmetry axis. A clear connection is established between the electron g-factor and the amplitude of the those valence-state envelope functions which possess non-zero orbital momentum associated with the envelope function. The dependence of the exciton diamagnetic coefficients on the quantum dot height is found to correlate with the energy dependence of the effective mass. Calculated exciton g-factor and diamagnetic coefficients, constructed from the values associated with the electron and hole constituents of the exciton, match experimental data well, however including the Coulomb interaction between the electron and hole states improves the agreement. Remote-band contributions to the valence-band electronic structure, included perturbatively, reduce the agreement between theory and experiment.