Exciton Absorption in GaN |
| M. Sobol and W. Bardyszewski Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland |
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| The absorption coefficient of the wurtzite-type GaN is described in terms of three almost totally decoupled excitons A, B, C associated with split valence bands of Γ9, Γ7 and Γ7 symmetries using a spherically symmetric approximation for the standard effective-mass Hamiltonian. The excitonic equations are solved within the subspace of optically active states of s-symmetry. The effects of crystal field and spin-orbit coupling are discussed. The results show that the spherical approximation is in perfect agreement with experimental findings. |
| DOI: 10.12693/APhysPolA.94.534 PACS numbers: 71.35.-y, 78.20.Bh, 78.66.Fd |