Abstract
The so-called optical or dynamical Stark effect of excitons in semiconductors is studied by applying a two-band density matrix approach. It is found that the effect of a Stark-like field induced modification of the excitonic envelope function can be neglected. A pump pulse below the exciton resonance leads to a blue-shift and a bleaching. These two effects are linked in such a way that the shift can at most be of the order of the dephasing rate. The essential features of the effect are found to be present already in the two-level approximation where other resonances and the absorption continuum are neglected.
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