Physics – Condensed Matter – Materials Science
Scientific paper
2012-02-03
Physics
Condensed Matter
Materials Science
9 pages, 3 figures, submitted to Physical Review B
Scientific paper
Scanning tunneling spectroscopy suggests the formation of a two dimensional electron gas (2DEG) on the TiO2 terminated surface of undoped SrTiO3 single crystals annealed at temperature lower than 400 {\deg}C in ultra high vacuum conditions. Low energy electron diffraction indicates that the 2D metallic SrTiO3 surface is not structurally reconstructed, suggesting that non-ordered oxygen vacancies created in the annealing process introduce carriers leading to an electronic reconstruction. The experimental results are interpreted in a frame of competition between oxygen diffusion from the bulk to the surface and oxygen loss from the surface itself.
Capua R. Di
de Luca G. M.
di Uccio Umberto Scotti
Granozio Fabio Miletto
Maggio-Aprile Ivan
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