The effect of elastic scattering due to impurities in the quantum waveguide is investigated with an exact calculation. We treat it as a one-dimensional scattering problem and neglect any width effect. The method is applied to the quantum modulated transistor and Aharonov–Bohm ring. It is found that the overall transmission of the structure is distorted due to the scattering, the extent of distortion is not only dependent on the impurity potential strength but also on impurity positions. The cutoff frequency of the transistor affected by the scattering is also discussed.
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Mao et al. (1993) studied this question.
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