THE COUPLING BETWEEN QUASI-LOCALIZED STATES IN SEMICONDUCTOR DOUBLE-QUANTUM BARRIERS

The interaction between above-barrier states quasilocalized in barrier layers was studied in a double quantum barrier configuration. Optical transmission experiments were performed on type-II CdSe/ZnTe samples, in which the valence band has a double-barrier structure. Numerical s tudies reveal a change of symmetry for the coupled quasilocalized stat es, as a function of the separation between the two barriers. Conseque ntly, the strongest optical transition occurs between different pairs of states as the barrier separation changes. The behavior is illustrat ed by both experimental and numerical results. (C) 1998 Elsevier Scien ce Ltd. All rights reserved.