Abstract
We employ density-functional theory within the generalized-gradient approximation to study the structural and electronic properties of Cu-doped GaN. We find that spin polarization on the Cu atoms in the GaN lattice is very small, leading to rather weak ferromagnetic behavior. We therefore suggest that Cu-doped GaN is unsuitable for spintronics applications. Our results refute previous calculations, which reported robust ferromagnetism in Cu-doped GaN.
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