Boundary conditions for excitons in CdS

N. N. Akhmediev; M. I. Sazhin; A. V. Sel'kin

doi:10.1117/12.200990

9 February 1995 Boundary conditions for excitons in CdS

N. N. Akhmediev, M. I. Sazhin, A. V. Sel'kin

Proceedings Volume 2362, International Conference on Excitonic Processes in Condensed Matter; (1995) https://doi.org/10.1117/12.200990
Event: Excitonic Processes in Condensed Matter: International Conference, 1994, Darwin, Australia

Abstract

The specular reflection spectra of CdS crystals are determined at T equals 2 K in the region of the Anequals1 exciton resonance. The great variability in the spectra cannot not be explained by the simple model of an exciton-free dead layer at the boundary of a crystal. Generalized boundary conditions are formulated for the excitons of large radius, which includes inhomogeneous additional boundary conditions for the exciton polarization and inhomogeneous boundary conditions for the tangential component of the magnetic induction vector B. An analysis of the energy balance equations at the surface of a crystal yields additional relationships between the parameters of the theory. The proposed system of boundary conditions describes the case with a sharp internal boundary at the dead layer and allows for the effects of the intrinsic and extrinsic mechanisms for formation of this layer. The reflection spectra of normally incident light are calculated numerically for various relationships between the parameters of the theory. All quantitative features of the optical exciton reflection spectra are in good agreement with the experimental data. We also give explicit expressions for the reflection and transmission coefficients of an optical wave incident normally on the plate.

Citation Download Citation

N. N. Akhmediev, M. I. Sazhin, and A. V. Sel'kin "Boundary conditions for excitons in CdS", Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); https://doi.org/10.1117/12.200990

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