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arXiv 1709.07348cond-mat.mtrl-sci
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纳米线在TiO2-terminated SrTiO3(001)表面的生长及电子性质

Growth and electronic properties of nanolines on TiO2-terminated SrTiO3(001) surfaces

W. Yan, W. Sitaputra, M. Skowronski, R. M. Feenstra

摘要:

用扫描隧道显微镜和光谱原位研究了同质外延生长的TiO_2封端的SrTiO_3(001)表面。通过控制Ti/Sr比,发现在表面上形成高度有序的线性纳米结构的二维域,即所谓的“纳米线”。为了进一步研究表面结构如何影响能带结构,对这些表面进行了光谱研究。我们的研究结果揭示了显着更多的带弯曲的表面与纳米线,表示与这些功能相关的受体状态。此外,在高缺氧条件下生长的纳米线表面上观察到间隙状态。这种状态似乎与先前观察到的相同,由表面氧空位的(++/+)跃迁能级引起。

英文摘要:

Surfaces of homoepitaxially grown TiO2-terminated SrTiO3(001) were studied in situ with scanning tunneling microscopy and spectroscopy. By controlling the Ti/Sr ratio, two-dimensional domains of highly ordered linear nanostructures, so-called "nanolines", are found to form on the surface. To further study how the surface structure affects the band structure, spectroscopic studies of these surfaces were performed. Our results reveal significantly more band bending for surfaces with the nanolines, indicative of an acceptor state associated with these features. Additionally, an in-gap state is observed on nanoline surfaces grown under high oxygen deficient conditions. This state appears to be the same as that observed previously, arising from the (++/+) transition level of surface oxygen vacancies.

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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