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arXiv 1202.0634cond-mat.mtrl-scicond-mat.other
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退火SrTiO3单晶表面二维电子气的扫描隧道谱观察

Observation of a two-dimensional electron gas at the surface of annealed SrTiO3 single crystals by scanning tunneling spectroscopy

R. Di Capua, M. Radovic, G. M. De Luca, I. Maggio-Aprile, F. Miletto Granozio, N. C. Plumb, Z. Ristic, U. Scotti di Uccio, R. Vaglio, M. Salluzzo

摘要:

扫描隧道光谱表明在超高真空条件下在低于400 °C的温度下退火的未掺杂SrTiO 3单晶的TiO 2终止表面上形成二维电子气(2DEG)。低能电子衍射表明,2D金属SrTiO 3表面没有结构重建,这表明在退火过程中产生的无序氧空位引入载流子,导致电子重建。实验结果被解释在一个框架中的氧从体到表面的扩散和表面本身的氧损失之间的竞争。

英文摘要:

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 °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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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