Quasiparticle Band Structure of AlN and GaN

Physical Review B 48, 11810 - 11816 (1993)

Quasiparticle Band Structure of AlN and GaN

A. Rubio, J.L. Corkill, M.L. Cohen, E.L. Shirley, S.G. Louie

The ab initio pseudopotential method within the local-density approximation and the quasiparticle approach have been used to investigate the electronic properties of AlN and GaN in the wurtzite and zinc-blende structures. The quasiparticle band-structure energies are calculated using a model dielectric matrix for the evaluation of the electron self-energy. For this calculation, good agreement with the experimental results for the minimum band gaps in the wurtzite structure is obtained. In the zinc-blende structure we predict that AlN will be an indirect (Γ to X) wide band-gap semiconductor (4.9 eV) and that GaN will have a direct gap of 3.1 eV at Γ in good agreement with recent absorption experiments on cubic GaN (3.2–3.3 eV). A discussion of the direct versus indirect gap as well as other differences in electronic structure between the wurtzite and zinc-blende phases is presented. Other properties of quasiparticle excitations are predicted in this work and remain to be confirmed by experiment.

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