Quantum wells with zero valence-band offset: Drastic enhancement of forbidden excitonic transitions.
- Kavokin, A.V.
- Kaliteevski, M.A.
- Goupalov, S.V
- Berger, J.D.
- Lyngnes, O.
- Gibbs, H.M.
- Khritova, G.
- Ribayrol, A.
- Bellabchara, A.
- Lefebvre, Pierre
- Coquillat, D.
- Lascaray, Jean-Paul
DOIAbstract
International audienceForbidden e1hh3 and e1lh3 exciton transitions (where hh and lh are heavy-hole and light-hole, respectively) appear in magnetooptical spectra of quantum wells that undergo a type-I-type-II band-alignment transition, here for ordinary (In,Ga)As/GaAs multiple quantum wells and a single CdTe quantum well with a (Cd,Mn)Te semimagnetic barrier exhibiting a giant Zeeman effect. The oscillator strength becomes so strong in a field of 11.25 T that vacuum-field Rabi splitting is clearly seen in reflection spectra when the e1lh3 exciton transition couples to the two-dimensional optical mode in a microcavity
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