Direct intersubband optical absorption of semiconducting thin wire

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Abstract
The optical absorption due to direct intersubband transitions and including the broadening effects has been calculated by using an electric dipole approximation for a quasi-one-dimensional semiconducting thin wire. Effective mass approximation is adopted to determine the eigen functions and energies of the conduction electrons in Schrodinger equation by assuming a two-dimensional infinite potential well. When the electromagnetic wave is polarized in a ẑ direction which possesses a size-quantization effect in the thin wire, the selection rule requires that the sum of the quantum numbers of the initial state and finial state must be odd integers. ac and dc conductivities, and the absorption line shapes due to collisions are discussed.