Abstract
Titania (TiO${}_{2}$) continues to be closely investigated for a host of applications, including the photocatalytic splitting of water (a clean source of H${}_{2}$ for fuel cells and the ``hydrogen economy''). This study reveals the special electronic structure of the (001) surface: The anisotropy of the anatase crystal structure leads to two-dimensional orbital interactions, localized surface states, and facilitated electron-hole separation. This physical insight may help to identify and engineer functionalities of other oxide surfaces as well.
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