期刊
PHYSICAL REVIEW B
卷 94, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.245418
关键词
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资金
- European Commission
- US Department of Energy, Office of Science, Office of Basic Energy Sciences, Energy Frontier Research Center [DE-AC36-08GO28308]
A joint experimental and theoretical study is presented for the electronic structures of copper oxides including Cu2O, CuO, and the metastable mixed-valence oxide Cu4O3. The optical band gap is determined by experimental optical absorption coefficient, and the electronic structure in valence and conduction bands is probed by photoemission and electron energy loss spectroscopies, respectively. The experimental results are compared with many-body GW calculations utilizing an additional on-site potential for d-orbital energies that facilitates tractable and predictive computations. The side-by-side comparison between the three oxides, including a band insulator (Cu2O) and two Mott/charge-transfer insulators (CuO, Cu4O3) leads to a consistent picture for the optical and band-structure properties of the Cu oxides, strongly supporting indirect band gaps of about 1.2 and 0.8 eV in CuO and Cu4O3, respectively. This comparison also points towards surface oxidation and reduction effects that can complicate the interpretation of the photoemission spectra.
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