Abstract
The exciton condensation in a magnetic field, parallel to the interfaces, tunable type-I/type-II multiple quantum well structure made by semimagnetic materials of CdTe/CdMnTe has been investigated theoretically. In the type-II regime, the magnetic field results in suppression of exciton condensation, which in turn is attributed to the field-induced polarization of exciton, the increases of magnetic confinements and interacting strengths of electrons and holes. Detailed calculations show an ∼10meV insulating gap in the case of B=20T and n≈16×1010cm−2, and exhibit a transition from Bose–Einstein condensation to BCS condensed phase with increased excitonic density.
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