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Exploration of novel strongly correlated electronic states by dopant adsorption on Mott insulators

Research Project

Project/Area Number 21K13872
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionThe University of Tokyo

Principal Investigator

HORIO MASAFUMI  東京大学, 物性研究所, 助教 (80897025)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsモット転移 / 光電子分光 / 強相関電子系 / 表面吸着 / キャリアドープ / 表面キャリアドープ
Outline of Research at the Start

本研究課題では。キャリアドーパントの表面吸着によるモット絶縁体のその場制御を行う。特に、モット転移の実現を試みる。得られた表面電子状態は、真空紫外光を用いた高分解能角度分解光電子分光と、軟X線を用いた内殻光電子分光の相補的な利用によってその全貌を解明する。表面への原子・分子吸着により、化学置換が困難な試料へのキャリアドープが可能となるだけではなく、表面電場や化学結合による表面特有の効果の発現が期待される。固体表面に特有な高い操作性を駆使することで、新たな強相関金属状態の実現とその性質・起源の解明を目指す。

Outline of Final Research Achievements

In this research project, we explored novel Mott transitions by dopant adsorption on the surface of Mott insulators. In particular, we deposited alkali metals and C60 on Mott-insulating Ca2RuO4 and found, by observing the surface electronic states using photoemission spectroscopy, a metallic state which cannot be realized by carrier doping to the bulk of the sample. Furthermore, we extended the target to strongly correlated materials in general which do not accept carrier doping by chemical substitutions and/or where the influence of carrier doping remains unclear. It was found that, by alkali-metal dosing, that the metal-semimetal transition in Ca3Ru2O7 is suppressed and a new metallic state is realized. We also revealed that the antiferromagentic correaltion in the high-temperature superconductor (Pr,La,Ce)2CuO4 varies depending directly on the electron concentration.

Academic Significance and Societal Importance of the Research Achievements

固体にキャリアをドープする方法として、結晶中の元素の一部を価数の異なる元素で置換するという手法が広く用いられてきたが、イオン半径の違いにより元素置換が施せず、キャリアをドープできないような場合が多く存在した。本研究では、自由度の高い固体表面を土台にすることで、元素置換に依らない原子・分子表面吸着によりキャリアドープを実現し、それを表面敏感な光電子分光を用いて直接観測することで、固体内部では実現できないような新たな強相関金属状態を見出した。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (11 results)

All 2023 2022 2021 Other

All Int'l Joint Research (2 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Int'l Joint Research] University of Zurich(スイス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Salerno(イタリア)

    • Related Report
      2021 Research-status Report
  • [Presentation] Photoemission study of single-layer cuprates with different oxygen coordinations and carrier types2023

    • Author(s)
      Masafumi Horio
    • Organizer
      International workshop on Microscopic Properties of Quantum Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 角度分解光電子分光によるT*型銅酸化物高温超伝導体の電子構造の研究2023

    • Author(s)
      堀尾眞史, Xie Peiao, 宮本将成, 和田哲弥, Jacek Osiecki, Balasubramanian Thiagarajan, Craig Polley, 田中清尚, 北村未歩, 堀場弘司, 小澤健一, 谷口貴紀, 藤田全基, 松田巌
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 角度分解光電子分光を用いたT’型銅酸化物高温超伝導体における不均一な還元アニール効果の研究2023

    • Author(s)
      宮本将成, 堀尾眞史, 森谷要, 高橋晶, Malik Anjelh Baqiya, 辻川夕貴, 和田哲弥, Jacek Osiecki, Balasubramanian Thiagarajan, Craig Polley, 田中清尚, 小池洋二, 足立匡, 溝川貴司, 松田巌
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 放射光施設における新規物質作製とその場電子状態評価2022

    • Author(s)
      堀尾眞史
    • Organizer
      NanospecFY2021mini
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Ca2RuO4への表面キャリアドープによるモット転移: 角度分解光電子分光による研究2021

    • Author(s)
      堀尾眞史, D. Sutter, F. Forte, C. G. Fatuzzo, S. Moser, 和田哲弥, R. Fittipaldi, A. Vecchione, V. Granata, Y. Sassa, G. Gatti, M. Grioni, H. M. Ronnow, M. Hoesch, T. K. Kim, C. Jozwiak, A. Bostwick, E. Rotenberg, 松田巌, M. Cuoco, J. Chang
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Ca2RuO4への表面キャリアドープによるモット転移: X線内殻光電子分光法による研究2021

    • Author(s)
      和田哲弥, 堀尾眞史, 工藤佳生, V. Granata, R. Fittipaldi, A. Vecchione, J. Chang, 松田巌
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Alkali-metal induced surface metallization of the Mott insulator Ca2RuO4 studied by angle-resolved photoemission spectroscopy2021

    • Author(s)
      M. Horio, D. Sutter, F. Forte, C. G. Fatuzzo, S. Moser, T. Wada, R. Fittipaldi, A. Vecchione, V. Granata, Y. Sassa, G. Gatti, M. Grioni, H. M. Ronnow, M. Hoesch, T. K. Kim, C. Jozwiak, A. Bostwick, E. Rotenberg, I. Matsuda, M. Cuoco, J. Chang
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Surface-doping induced Mott breakdown in Ca2RuO42021

    • Author(s)
      M. Horio, D. Sutter, F. Forte, C. G. Fatuzzo, S. Moser, T. Wada, R. Fittipaldi, A. Vecchione, V. Granata, Y. Sassa, G. Gatti, M. Grioni, H. M. Ronnow, M. Hoesch, T. K. Kim, C. Jozwiak, A. Bostwick, E. Rotenberg, I. Matsuda, M. Cuoco, J. Chang
    • Organizer
      Advanced Spectroscopy of Organic Materials for Electronic Applications (ASOMEA-X)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mott transition in Ca2RuO4 driven by surface carrier doping: an x-ray photoelectron spectroscopy study2021

    • Author(s)
      T. Wada, M. Horio, Y. Kudo, V. Granata, R. Fittipaldi, A. Vecchione, J. Chang, I. Matsuda
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2024-01-30  

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