Valence band electronic structure characterization of the rutile TiO2 (110)-(1 × 2) reconstructed surface

The electronic structure of the TiO2 (110)-(1 × 2) surface has been studied by means of angular resolved ultraviolet photoemission spectroscopy (ARUPS). The valence band dispersion along the high symmetry surface directions, [001] and [1–10], has been recorded. The experimental data show no dispersion of the band-gap Ti 3d states. However, the existence of dispersive bands along the [001] direction located at about 7 eV below the Fermi level is reported. The existence of two different contributions in the emission from the defects-related state located in the gap of the surface is univocally shown for the first time.This work has been supported by the Spanish CYCIT (MAT2011-26534) and the Ministry of Science and Innovation (CSD2007-41 NANOSELECT). C.S.S. gratefully acknowledges Ministerio de Educación for the financial support inside the “FPU programme” under the AP2005-0433 grant. M.G. G. and P.A. are grateful for the support by the Fonds National Suisse pour la Recherche Scientifique through Div. II and the Swiss National Center of Competence in Research MaNEP. M.B.-R. acknowledges financial support from the Gipuzkoako Foru Aldundia and the European Union 7th Framework Programme (FP7/2007–2013) under grant agreement no. FP7-PEOPLE-2010-RG276921.Peer reviewe