Ryotaro Hayasaka, T. Kanda, Y. Masutake, Duy Khanh Nguyen, N. Hasegawa, Seitaro Inoue, Asato Wada, M. Kitamura, D. Shiga, K. Yoshimatsu, H. Kumigashira
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引用次数: 0
摘要
界面带排列是设计电子器件和人工功能材料的基本参数之一。然而,氧化物异质结构并没有牢固确立的准则,这限制了氧化物异质结构的功能设计。在此,我们提供了光谱证据,证明氧化物异质界面的能带图可以用基于共同阴离子规则的钟和汉斯曼方案很好地描述[Z. Zhong and P. Hansmann, Phys. Rev. X 7, 011023 (2017)]。通过利用 Ti 2p-3d 共振光发射对费米水平附近 Ti 3d 态的元素选择性,我们直接观察到在 SrVO3/SrTiO3 和 SrNbO3/SrTiO3 原型异质界面中是否存在从覆盖层薄膜到 SrTiO3 的电荷转移。研究发现,电荷转移发生在 SrNbO3/SrTiO3 中,而不是 SrVO3/SrTiO3 中,正如 Zhong 和 Hansmann 方案所预测的那样。我们的发现为设计和控制氧化物纳米结构的功能性提供了指导。
Common anion rule in oxide heterointerfaces: Experimental verification by in situ photoemission spectroscopy
The band alignment at the interface is one of the fundamental parameters for designing electronic devices and artificial functional materials. However, there is no firmly established guideline for oxide heterostructures, limiting the functional design of oxide heterostructures. Here, we provide spectral evidence that the band diagram of oxide heterointerfaces is well described by the Zhong and Hansmann scheme based on the common anion rule [Z. Zhong and P. Hansmann, Phys. Rev. X 7, 011023 (2017)]. By utilizing the elemental selectivity of Ti 2p–3d resonant photoemission for the Ti 3d state near the Fermi level, we directly visualize the presence or absence of charge transfer from the overlayer films to SrTiO3 in prototypical heterointerfaces of SrVO3/SrTiO3 and SrNbO3/SrTiO3. It is found that the charge transfer occurs in SrNbO3/SrTiO3 but not in SrVO3/SrTiO3, as predicted by the Zhong and Hansmann scheme, indicating that the presence or absence, as well as the sign and amount, of interfacial charge transfer is predicted by this scheme. Our findings provide guidelines for designing and controlling the functionalities in oxide nanostructures.
期刊介绍:
APL Materials features original, experimental research on significant topical issues within the field of materials science. In order to highlight research at the forefront of materials science, emphasis is given to the quality and timeliness of the work. The journal considers theory or calculation when the work is particularly timely and relevant to applications.
In addition to regular articles, the journal also publishes Special Topics, which report on cutting-edge areas in materials science, such as Perovskite Solar Cells, 2D Materials, and Beyond Lithium Ion Batteries.