Exchange effects on excitons in quantum wells.

Yong Chen (1) , Bernard Gil (1) , Pierre Lefebvre (1) , Henry Mathieu (1)

1 GES - Groupe d'étude des semiconducteurs

Exchange splitting of quasi-two-dimensional excitons confined in quantum wells is studied theoretically by performing a simplified calculation with a scaling argument. Both the exchange energy and the longitudinal-transverse splitting are found to be enhanced drastically when the confinement of the exciton increases. Taking into account the difference of the enchange interaction between the heavy-hole and the light-hole exciton, the intrinsic splittings of the exciton ground states are calculated for GaAs-Ga1−xAlxAs quantum wells within the envelope-function approximation.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique [physics.optics]; Micro et nanotechnologies/Microélectronique; Optique / photonique

Yong Chen, Bernard Gil, Pierre Lefebvre, Henry Mathieu. Exchange effects on excitons in quantum wells.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 1988, 37 (11), pp.4. ⟨10.1103/PhysRevB.37.6429⟩. ⟨hal-01175568⟩