QUANTUM-CONFINED STARK-EFFECT IN SEMICONDUCTOR QUANTUM-WELLS INCLUDING VALENCE-BAND MIXING AND COULOMB EFFECTS

In this paper we present a complete model to; evaluate the electro-opt ic response of a semiconductor quantum well structure. Heavy and light hole mixing in the valence band is included by using a variational te chnique to determine the basis states. The excitonic effects, which ar e clearly evident at room temperature in quantum well structures, aris e from coulomb interaction between the charged particles; the correspo nding many body problem is treated in the framework of the second quan tization approach, by writing the total hamiltonian of the interacting electron-hole plasma. The electro-optic responses, both for TE and TM polarized light, are computed by summing up the contributions of all the different transitions; they show a good agreement with experimenta l results.