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(In Japanese)量子閉じ込めモット絶緑体における強相関系の光学構築

Research report code R070000051
File No. R070000051
Posted date Apr 11, 2008
  • (In Japanese)Harold.Hwang
  • (In Japanese)Department of Advanced Materials Science, University of Tokyov
Research organization
  • (In Japanese)Department of Advanced Materials Science, University of Tokyo
Report name (In Japanese)量子閉じ込めモット絶緑体における強相関系の光学構築
Technology summary (In Japanese)A diverse range of physical properties can be found in perovskite oxides closely latticed-matched to one another. Our general research interest is to develop these materials as a new heteroepitaxial family with new physical phenomena and devices, focusing on atomic scale control and design. When we consider basic artificial structures used in semiconductor devices, such as heterojunctions and quantum wells, we find two important issues arise when incorporating perovskites: 1) The atomic composition of the interface. For abrupt perovskite interfaces in the (001) orientation, there are two different interface terminations which can be grown with often vastly different electronic properties. 2) Incorporating strongly correlated electrons. A key feature for poorly screened electrons is that the electronic structure evolves with electron density, quite different from filling electrons into a rigid single particle band. The aim this project is to develop the materials ingredients and optical probes for using band bending and quantum confinement with correlated electrons in perovskite oxide heterostructures.

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Research field
  • Surface structure of solids in general
  • Metal‐insulator transitions
Published papers related (In Japanese)(1) L. Fitting, Y. Hotta, T. Susaki, H.Y. Hwang, and D.A. Muller, "Nanometer Scale Electronic Reconstruction at the Interface between LaVO3 and LaVO4," Physics Review Letters, submitted.
(2) Y. Hotta, H. Wadati, A. Fujimori, T. Susaki, and H.Y. Hwang, "Electronic Structure of the Mott Insulator LaVO3 in a Quantum-Well Geometry," Applied Physics Letters, submitted.
(3) N. Nakagawa, H.Y. Hwang, and D.A. Muller, "Why Some Interfaces Cannot be Sharp," Nature Materials 5, 204 (2006).
(4) N. Nakagawa, M. Asai, Y. Mukunoki, T. Susaki, and H.Y. Hwang, "Magnetocapacitance and Exponential Magnetoresistance in Manganite-Titanate Heterojunctions," Applied Physics Letters 86, 082504 (2005).
(5) A. Ohtomo and H.Y. Hwang, "A High-Mobility Electron Gas at the LaAlO3/SrTiO3 Heterointerface," Nature 427, 423 (2004).
Research project
  • Precursory Research for Embryonic Science and Technology.;Nanostructure and Material Ptoperty, Light and Control
Information research report
  • (In Japanese)Harold.Hwang. 量子閉じ込めモット絶緑体における強相関系の光学構築. 個人型研究(さきがけタイプ)ナノテクノロジー分野2領域合同研究報告会 講演要旨集 「ナノと物性」「光と制御」領域(研究期間2003-2006), 2006. p.12 - 13.