The Role of Impurity Scattering in the Quantum Waveguide

Abstract

The effect of elastic scattering due to impurities in the quantum waveguide is investigated with an exact calculation. It is treated as a one-dimensional scattering problem and any width effect is neglected.The method is applied to the quantum modulated transistor and the Aharonov-Bohm ring. The overall transmission of the structure is found to be distorted owing to the scattering, the extent of the distortion being not only dependent on the impurity potential strength, but also on the impurity positions. The cutoff frequency of the transistor affected by the scattering is also discussed.