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Self‐consistent simulations, including free carrier screening and many body effects, have been carried out for Stark shifts of intersubband transitions in step quantum wells. Unlike carrier screening in single quantum wells, where the charge distribution screens the applied field and reduces the Stark shift, our numerical results show that the asymmetric nature of the step quantum well may yield to an enhancement in the Stark shift. Discrepancies between experimental data and theoretical simulations are also addressed.