Optical dielectric function of intrinsic amorphous silicon
- 15 December 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 18 (12), 6829-6833
- https://doi.org/10.1103/physrevb.18.6829
Abstract
The imaginary part of the optical dielectric function has been calculated using a continuous-random-tetrahedral network as the structural model for the atomic positions. Here the electronic energies and wave functions are determined by first-principles calculations with the method of linear combinations of atomic orbitals (LCAO), and the momentum matrix elements are evaluated directly from the LCAO wave functions. The calculated dielectric function is in good overall agreement with experiment. At energies within 1 eV above the threshold, the curve shows some structures that are due to interband transitions between the localized states near the band gap.
Keywords
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