Characteristics of a quantum waveguide: Effects of finite confinement potential and geometrical deformations and comparison with simple theoretical approach

Abstract

Based on numerical solutions for the transmission characteristics of a typical quantum waveguide (the T-structure and its modifications), some effects of practical importance, the finiteness of confinement potential and the geometrical deviations from the ideal shape, are clarified. Numerical results are also compared with those of the simplified S-matrix method and the applicability of the latter is discussed. The results may be useful in applying a quantum waveguide to electronic devices and in analyzing more complex structures by the simplified S-matrix.