The results of a density functional calculation on gallium nitride are
given. We use norm-conserving pseudopotentials with sufficiently exte
nded sets of plane waves to investigate the ground-state properties an
d the electronic band structure for the zincblende phase of GaN and co
mpare them with the corresponding results for the wurtzite structure.
A comparison with the outcomes of other calculations and with the exis
ting experimental data is also given.