Quantum-confined Stark effect in graded-gap quantum wells

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Abstract
Exciton states in AlxGa1−xAs graded‐gap quantum well structures with an electric field perpendicular to the layer have been calculated. The calculations show that, for the ground‐state heavy‐hole exciton in this quantum well structure, the dependence of Stark shift and the oscillator strengths on the external electric field is quite different from the case of the usual square‐shaped quantum well structure, whereas for the ground‐state light‐hole exciton there is no significant difference between these two quantum well structures. These results can be interpreted in terms of the difference between the heavy‐hole effective mass and the light‐hole one.