Two-dimensional charged magneto-excitons: Magnetic translations and localization

Abstract

For composite complexes -- quasi-two-dimensional (2D) charged magneto-excitons X- -- we propose a new exact classification of states, which is based on magnetic translations. We consider implications of this symmetry for magneto-optical transitions. It is shown, in particular, that in a translationally-invariant system with a simple valence band, the ground triplet X- state is dark in interband transitions at finite magnetic fields B. This exact result calls for the re-interpretation of several previous theoretical studies. We consider the symmetry-breaking effects of spatial lateral confinement on internal transitions of charged complexes.

Contribution to EP2DS-13, submitted to Physica E; 3 pages, one ps figure included

Cited by in corpus (6)

• Magnetic field dependence of the energy of negatively charged excitons in semiconductor quantum wells
• Definitive observation of the dark triplet ground state of charged excitons in high magnetic fields
• Positively charged magneto-excitons in a semiconductor quantum well
• Trions in a periodic potential
• Internal transitions of quasi-2D charged magneto-excitons in the presence of purposely introduced weak lateral potential energy variations
• Internal transitions of negatively charged magnetoexcitons in quantum dots