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Electronic structure of cubic GaN with self-energy corrections

Palummo, M., Reining, L., Godby, R.W., Bertoni, C.M. and Börnsen, N. (1994) Electronic structure of cubic GaN with self-energy corrections. Europhysics Letters, 26 (8). pp. 607-612. ISSN 0295-5075

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Abstract

We present the result of a calculation for the bulk electronic structure of gallium nitride in the zincblende phase. We determine the equilibrium lattice constant, the cohesive energy and the bulk modulus in the Density Functional approach within the Local Density Approximation (DFT-LDA). The one-particle eigenvalues of the DFT Kohn-Sham equation do in principle not agree with the experimental band structure. Therefore, we calculate the quasiparticle energies by including self-energy corrections to the DFT-LDA exchange-correlation potential, with the GW approximation for the electron self-energy. We use norm-conserving pseudopotentials and a large plane-wave basis set (100 Ry cut-off) for a converged calculation in the DFT-LDA. The LDA band gap turns out to be very sensitive to the crystal volume. We find that GW corrections to the LDA band gap are significant. A detailed comparison with other DFT-LDA results and approximate GW calculations and with existing experimental data is given.

Item Type: Article
Copyright, Publisher and Additional Information: © 1994 Institute of Physics.
Academic Units: The University of York > Physics (York)
Depositing User: Physics Import
Date Deposited: 17 Oct 2008 14:54
Last Modified: 17 Oct 2008 14:54
Published Version: http://dx.doi.org/10.1209/0295-5075/26/8/009
Status: Published
Publisher: Institute of Physics
Identification Number: 10.1209/0295-5075/26/8/009
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/3985

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