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arXiv 1804.04466cond-mat.mtrl-sci
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SrTiO $_3$(110)面的畴界空位簇和能带弯曲

Vacancy clusters at domain boundaries and band bending at the SrTiO$_3$(110) surface

Zhiming Wang, Xianfeng Hao, Stefan Gerhold, Michael Schmid, Cesare Franchini, Ulrike Diebold

摘要:

利用扫描隧道显微镜、X射线光电子能谱和密度泛函理论(DFT)计算研究了SrTiO $_3$(110)表面($n \times 1$)($n=4,5$)重构中的反相畴界.两种类型的APDB形成的每一个重建,它们由Ti $_x$ O $_y$空缺集群与特定的化学计量。这些团簇的存在由退火期间的氧压控制。用密度泛函理论对空位团簇的结构模型进行了解析,结果表明空位团簇的相对稳定性取决于氧的化学势。表面能带弯曲可以通过控制畴界处的空位团来调节。

英文摘要:

Antiphase domain boundaries (APDBs) in the ($n \times 1$)($n=4,5$) reconstructions of the SrTiO$_3$(110) surface were studied with scanning tunneling microscopy, x-ray photoemission spectroscopy, and density functional theory (DFT) calculations. Two types of APDBs form on each reconstruction; they consist of Ti$_x$O$_y$ vacancy clusters with a specific stoichiometry. The presence of these clusters is controlled by the oxygen pressure during annealing. The structural models of the vacancy clusters are resolved with DFT, which also shows that their relative stability depends on the chemical potential of oxygen. The surface band bending can be tuned by controlling the vacancy clusters at the domain boundaries.

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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