Electronic structure of Cu(1 0 0)(22×2)R45°–O surface: angle-resolved photoemission spectroscopy and tight-binding calculation

The electronic structure of Cu(1 0 0)(22×2)–O surface is investigated by angle resolved ultraviolet photoemission spectroscopy with p- and s-polarized light. A tight-binding two-dimensional energy band calculation is successfully made to reproduce the experimental band dispersions. In the calculation, the parameters (Slater–Koster two-center integrals) determined for Cu(1 1 0)p(2×1)–O surface are used except the on-site energy of oxygen 2p state. Those parameters reproduce the oxygen induced bonding states along Γ̄–Ȳ, and the anti-bonding states along Γ̄–M̄, quantitatively.