2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22636The electronic properties of quasi two-dimensional multicomponent systems are investigated in the presence of a perpendicular magnetic field. The effects of the presence of a few valence band holes on the properties of quantum Hall systems are examined by analyzing the results of exact numerical diagonalization of small electron-hole systems confined to the spherical surface. The novel type of elementary excitations, the angular momenta, binding energies, interaction pseudopotentials, and effects on the photoluminescence spectrum are presented.31 pages, 8 figures, review articleMesoscale and Nanoscale Physicstext