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    題名: Atomic-scale observation of a graded polar discontinuity and a localized two-dimensional electron density at an insulating oxide interface
    作者: Chang, C.-P.;Lin, J.-G.;Jeng, H.-T.;Cheng, S.-L.;Pong, W.-F.;Shao, Y.-C.;Chin, Y.-Y.;Lin, H.-J.;Chen, C.-W.;Yang, J.-R.;Chen, C.-H.;Chu, M.-W.
    貢獻者: 淡江大學物理學系
    日期: 2013-02
    上傳時間: 2014-03-19 16:45:05 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: Using atomically resolved electron energy-loss spectroscopy, the atomic-plane-by-atomic-plane, unit-cell-by-unit-cell stoichiometry, and charge characteristics of the oxide interface (Nd0.35Sr0.65)MnO3/SrTiO3, with a primitive polar discontinuity of (Nd0.35Sr0.65O)0.35+-(TiO2)0, were thoroughly investigated. (Nd0.35Sr0.65)MnO3 is a strongly correlated insulator and the interface was characterized to be insulating. The cell-specific stoichiometric evaluation unveiled an extensive interdiffusion across the interface. The plane-specific charge characterization revealed that the interdiffusion grades the primitive polar discontinuity. Despite the graded polar discontinuity, a charge transfer inversely into (Nd0.35Sr0.65)MnO3 was firmly resolved with a length scale of ∼2 nm and a charge density on the order of ∼1013/cm2 and is effectively mediated by an asymmetric Ti interdiffusion. The intricate electronic correlations of the interfacial (Nd0.35Sr0.65)MnO3 unit cells and the interdiffusion-induced chemical disorder tend to render the charges localized, resulting in a localized two-dimensional electron density and thus the insulating interface, in distinct contrast to the conventional understanding of a vanishing charge density for an insulating interface and the metallic two-dimensional electron gas found at other classical polar-discontinuous interface systems. A potential strain manipulation on the electronic localization of the electron density was also proposed.
    關聯: Physical Review B 87(7), 075129(9pages)
    DOI: 10.1103/PhysRevB.87.075129
    顯示於類別:[物理學系暨研究所] 期刊論文


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