Structure of rutile TiO2 (110)-(1 x 2): formation of Ti2O3 quasi-1D metallic chains |
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Authors: | Blanco-Rey M Abad J Rogero C Mendez J Lopez M F Martin-Gago J A de Andres P L |
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Affiliation: | Instituto de Ciencia de Materiales (CSIC), Cantoblanco, 28049 Madrid, Spain. |
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Abstract: | Combining STM, LEED, and density functional theory, we determine the atomic surface structure of rutile TiO2 (110)-(1 x 2): nonstoichiometric Ti2O3 stripes along the [001] direction. LEED patterns are sharp and free of streaks, while STM images show monatomic steps, wide terraces, and no cross-links. At room temperature, atoms in the Ti2O3 group have large amplitudes of vibration. The long quasi-1D chains display metallic character, show no interaction between them, and cannot couple to bulk or surface states in the gap region, forming good atomic wires. |
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