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The behavior of hydrogen in p-type Cu 2 O has been reported to be quite unusual. Muon experiments have been unable to ascertain the preferential hydrogen site within the Cu 2 O lattice, and indicate that hydrogen causes an electrically active level near the middle of the band gap, whose nature, whether accepting or donating, is not known. In this Letter, we use screened hybrid-density-functional theory to study the nature of hydrogen in Cu 2 O, and identify for the first time the "quasiatomic"doi:10.1103/physrevlett.106.186403 pmid:21635109 fatcat:j4r4epatrjhs3bw7bimg235eya