Charged excitons trapped on monomolecular CdTe islands in wide ZnTe-(Zn,Mg)Te quantum wells.

Thierry Taliercio (1) , Pierre Lefebvre (1) , Vincent Calvo (1) , Denis Scalbert (1) , Noël Magnéa (2) , Henry Mathieu (1) , Jacques Allègre (1)

1 GES - Groupe d'étude des semiconducteurs
2 CEA GRENOBLE - Commissariat à l'Énergie Atomique (CEA) DRMFC

Optical spectroscopy at T=2K reveals systematically a low-energy companion to the features of heavy- and light-hole excitons localized on CdTe 1-ML-high islands, buried in wide ZnTe/(Zn,Mg) Te quantum wells. These transitions are assigned to a negatively charged excitonic complex (trion) from magnetoreflectance and photoluminescence results. A mechanism of formation of the trion is proposed. A clear correlation is found between the exciton energies, which depend on the size and strain of the islands, and the trion binding energy, which varies between 1 and 3 meV.

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

Thierry Taliercio, Pierre Lefebvre, Vincent Calvo, Denis Scalbert, Noël Magnéa, et al.. Charged excitons trapped on monomolecular CdTe islands in wide ZnTe-(Zn,Mg)Te quantum wells.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 1998, 58 (23), pp.15408. ⟨10.1103/PhysRevB.58.15408⟩. ⟨hal-01302334⟩