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

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

1999-08-27

arxiv.org/abs/cond-mat/9908406v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1016/S1386-9477(99)00119-8

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.

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