The metallic band structure of the hydrogen-adsorbed SrTiO3(001) surface is studied by polarization-dependent photoemission spectroscopy measurements. With the dipole-transition selection arguments, we attributed the metallic peaks into the Ti 3dxz, 3dyz, and 3dxy bands. These t2g bands are partially filled with electrons upon H-induced downward band bending at the surface. Energy splitting of the Ti 3d t2g bands is considered to be induced by a quantum confinement along the surface normal (z) direction. The metallic peaks are accompanied by the incoherent states induced by many-body interactions, which likely indicates that the electronic system forms a two-dimensional liquid phase. Also emerged by H exposure are an in-gap state and a σ(O-H) state. The possible origin and the feature of these states are discussed from the polarization dependence of the photoemission intensity.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2013 Mar 25|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics