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The effect of Gamma-X mixing on the energy levels fine structure of indirectin k-space excitons in an ensemble of (In,Al)As/AlAs quantum dots with type Iband alignment was experimentally studied. Using the methods of optical spinorientation and optical alignment in a magnetic field, an increase in theanisotropic exchange splitting of excitonic levels (from approximately 0.6 to 5ueV) due to the Gamma-X mixing was revealed. The extent of direct electronicstates admixing to indirect ones depends on the size of the quantum dot. On theother hand, the optical and spin properties of excitons change radically withincreasing of the Gamma states admixture to the X states: in the absence of amagnetic field, the optical orientation of excitons decreases from 18 to 3%,while the alignment of excitons is restored from 6 to 53%.

Influence of Gamma-X mixing on optical orientation and alignment of excitons in (In,Al)As/AlAs quantum dots