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Jang, H.W; Felker, D.A; Bark, C.W; Wang, Y; Niranjan, M.K; Nelson, C.T; Zhang, Y; Su, D; Folkman, C.M; Baek, S.H; Lee, S; Janicka, K; Zhu, Y; Pan, X.Q; Fong, D.D; Tsymbal, E.Y; Rzchowski, M.S; Eom, C.B
Science (American Association for the Advancement of Science), 02/2011, Letnik: 331, Številka: 6019Journal Article
The formation of two-dimensional electron gases (2DEGs) at complex oxide interfaces is directly influenced by the oxide electronic properties. We investigated how local electron correlations control the 2DEG by inserting a single atomic layer of a rare-earth oxide (RO) (R is lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), or yttrium (Y) into an epitaxial strontium titanate oxide (SrTiO₃) matrix using pulsed-laser deposition with atomic layer control. We find that structures with La, Pr, and Nd ions result in conducting 2DEGs at the inserted layer, whereas the structures with Sm or Y ions are insulating. Our local spectroscopic and theoretical results indicate that the interfacial conductivity is dependent on electronic correlations that decay spatially into the SrTiO₃ matrix. Such correlation effects can lead to new functionalities in designed heterostructures.
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