High-frequency conductivity of films with different surfaces

The high-frequency conductivity of films with different surfaces and spherically symmetric energy band is calculated. General expressions are obtained for the conductivity for arbitrary values of the following quantities: the film thickness, the frequencies of the incident wave, and the specularity parameters with allowance for the bulk scattering mechanisms. A detailed analysis is made of the influence of the boundedness of the sample and the different surfaces on the conductivity in limiting cases with respect to the film thickness and the frequency of the incident wave. In particular, it is shown that in the case of thin films and low frequencies the conductivity decreases with decreasing thickness. The influence of different surfaces on the conductivity is also considered. The dependence of the coefficient of absorption of the wave on the film thickness and the carrier density is analyzed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 88–92, July, 1980.We are sincerely grateful to Professor B. M. Askerov for his interest in the work and a helpful discussion of the obtained results.