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Oshime, Norihiro Graduate School of Natural Science and Technology, Okayama University
Kano, Jun Graduate School of Natural Science and Technology, Okayama University
Ikenaga, Eiji Japan Synchrotron Radiation Research Institute, JASRI
Yasui, Shintaro Laboratory for Materials and Structures, Tokyo Institute of Technology
Hamasaki, Yosuke Laboratory for Materials and Structures, Tokyo Institute of Technology
Yasuhara, Sou Laboratory for Materials and Structures, Tokyo Institute of Technology
Hinokuma, Satoshi Innovative Oxidation Team, Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology
Ikeda, Naoshi Graduate School of Natural Science and Technology, Okayama University
Janolin, Pierre-Eymeric Université Paris-Saclay,CentraleSupélec, CNRS, Laboratoire SPMS
Kiat, Jean-Michel Université Paris-Saclay,CentraleSupélec, CNRS, Laboratoire SPMS
Itoh, Mitsuru Laboratory for Materials and Structures, Tokyo Institute of Technology
Yokoya, Takayoshi GResearch Institute for Interdisciplinary Science, Okayama University ORCID Kaken ID publons researchmap
Fujii, Tatsuo Graduate School of Natural Science and Technology, Okayama University Kaken ID publons researchmap
Yasui, Akira Japan Synchrotron Radiation Research Institute, JASRI
Osawa, Hitoshi Japan Synchrotron Radiation Research Institute, JASRI
Abstract
Skewed band structures have been empirically described in ferroelectric materials to explain the functioning of recently developed ferroelectric tunneling junction (FTJs). Nonvolatile ferroelectric random access memory (FeRAM) and the artificial neural network device based on the FTJ system are rapidly developing. However, because the actual ferroelectric band structure has not been elucidated, precise designing of devices has to be advanced through appropriate heuristics. Here, we perform angle-resolved hard X-ray photoemission spectroscopy of ferroelectric BaTiO3 thin films for the direct observation of ferroelectric band skewing structure as the depth profiles of atomic orbitals. The depth-resolved electronic band structure consists of three depth regions: a potential slope along the electric polarization in the core, the surface and interface exhibiting slight changes. We also demonstrate that the direction of the energy shift is controlled by the polarization reversal. In the ferroelectric skewed band structure, we found that the difference in energy shifts of the atomic orbitals is correlated with the atomic configuration of the soft phonon mode reflecting the Born effective charges. These findings lead to a better understanding of the origin of electric polarization.
Published Date
2020-07-01
Publication Title
Scientific Reports
Volume
volume10
Issue
issue1
Publisher
Nature
Start Page
10702
ISSN
2045-2322
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
© The Author(s) 2020
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publisher
PubMed ID
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.1038/s41598-020-67651-w
License
http://creat iveco mmons .org/licen ses/by/4.0/
Funder Name
Ministry of Education, Culture, Sports, Science and Technology
助成番号
R2705