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Free-carrier absorption in semiconducting quantum well wires for alloy-disorder scattering

A theory of free-carrier absorption is given for quasi-one-dimensional ternary semiconducting structures when the carriers are scattered by alloy disorder and the radiation field is polarized along the length of the wire. The free-carrier absorption coefficient is found to be an oscillatory function of the photon frequency and of the area of the cross-section of the wire. It is found that the absorption coefficient increases with decreasing transverse dimension of the quantum wire. The results obtained are compared with those from the quantum theory of free-carrier absorption in quasi-two-dimensional structures. In addition, it was found that in quantum wire the electron–alloy-disorder interaction gives a greater contribution to the absorption than the electron–acoustic phonon interaction.