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Electronic states near the band-width control Mott transition investigated by spectroscopic-imaging scanning tunneling microscopy

Research Project

Project/Area Number 19H01855
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Hanaguri Tetsuo  国立研究開発法人理化学研究所, 創発物性科学研究センター, チームリーダー (40251326)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Keywords走査型トンネル顕微鏡 / 分光イメージング / Mott絶縁体 / バンド幅制御 / フォノン / Dirac電子 / 電子ネマティシティ / Mott転移 / 電荷密度波 / 1T-TaS2 / NiS2
Outline of Research at the Start

本研究は、SのSe置換によってバンド幅制御型のMott転移を示す1T-TaS2-xSexとNiS2-xSexの二つの物質を対象に、分光イメージング走査型トンネル顕微鏡を用いて電子状態を系統的に調べ、Mott転移近傍の非自明な電子状態の探索を行うとともに、Mott転移の臨界領域における電子状態解明を行う。

Outline of Final Research Achievements

Spectroscopic-imaging scanning tunneling microscopy (SI-STM) has been mostly applied to cuprate superconductors, and other strongly correlated systems have remained unexplored. We applied SI-STM to band-width-controlled Mott insulators 1T-TaS2 and NiS2. Although the origin of the insulating behavior in 1T-TaS2 was controversial, we clearly showed that the strong correlation is the driver of the insulating behavior. We also discovered a novel bound state coupled with phonon just below the upper Hubbard band. As for NiS2, we revealed that the step edges exhibit metallic behavior.

Academic Significance and Societal Importance of the Research Achievements

強相関電子系は、高温超伝導現象をはじめとする非自明な物性創発の舞台であり、その背景となる電子状態の実験的解明は重要な学術的意義を持つ。本研究で、論争となっていた1T-TaS2の絶縁性の起源に関する電子相関の役割が明確になったことにより、本物質を舞台とする創発現象発現の期待が高まったといえる。フォノンと結合した新奇束縛状態は、このような強相関系に特徴的なダブロン様の励起と考えられ、今後のより詳しい研究の対象として興味深い。NiS2における金属的エッジ状態も、トポロジカル物性等、他分野との関連からも重要な発見であると考えている。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (15 results)

All 2022 2021 2020 2019 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Doublonlike Excitations and Their Phononic Coupling in a Mott Charge-Density-Wave System2021

    • Author(s)
      Butler C.J.、Yoshida M.、Hanaguri T.、Iwasa Y.
    • Journal Title

      Physical Review X

      Volume: 11 Issue: 1 Pages: 011059-011059

    • DOI

      10.1103/physrevx.11.011059

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mottness versus unit-cell doubling as the driver of the insulating state in 1T-TaS22020

    • Author(s)
      Butler C. J.、Yoshida M.、Hanaguri T.、Iwasa Y.
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 2477-2477

    • DOI

      10.1038/s41467-020-16132-9

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Scanning tunneling microscopy observation of electronic nematicity in the correlated Dirac semimetal BaNiS22022

    • Author(s)
      C. J. Butler, Y. Kohsaka, M. S. Bahramy, Y. Yamakawa, S. Onari, H. Kontani, T. Hanaguri, S. Shamoto
    • Organizer
      Annual Meeting of the Physical Society of Taiwan
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observation of Electronic Nematicity in the Dirac Semimetal BaNiS22022

    • Author(s)
      C. J. Butler, Y. Kohsaka, M. S. Bahramy, Y. Yamakawa, S. Onari, H. Kontani, T. Hanaguri, S. Shamoto
    • Organizer
      Quantum Liquid Crystals FYR03 Meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] STM observation of electronic nematicity within Landau levels at the ZrSiS surface2022

    • Author(s)
      C. J. Butler, M. Murase, T. Hanaguri and T. Sasagawa
    • Organizer
      ISSP workshop “Frontier of scanning probe microscopy and related nano science”
    • Related Report
      2021 Annual Research Report
  • [Presentation] Scanning Tunneling Microscopy Observation of Electronic Nematicity in the Dirac Semimetal BaNiS22021

    • Author(s)
      C. J. Butler, Y. Kohsaka, M. S. Bahramy, Y. Yamakawa, S. Onari, H. Kontani, T. Hanaguri, S. Shamoto
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Electronic nematicity observed in the correlated Dirac semimetal BaNiS22021

    • Author(s)
      C. J. Butler, Y. Kohsaka, M. S. Bahramy, Y. Yamakawa, S. Onari, H. Kontani, T. Hanaguri, S. Shamoto
    • Organizer
      第15回物性科学領域横断研究会 凝縮系科学の最前線
    • Related Report
      2021 Annual Research Report
  • [Presentation] バンド幅制御モット絶縁体NiS2-xSexの分光イメージングSTM2021

    • Author(s)
      安井勇気, 岡崎尚太, 宮坂茂樹, 花栗哲郎, 笹川崇男, 高木英典
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Tunneling injection of doublon-like excitations and their coupling to the charge density wave in 1T-TaS22021

    • Author(s)
      C. J. Butler,M. Yoshida,T. Hanaguri,Y. Iwasa
    • Organizer
      American Physical Society March Meeting 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Exotic Bound States and Dynamics of Electron-Phonon Coupling Observed in 1T-TaS2 Using Scanning Tunneling Microscopy2020

    • Author(s)
      C. J. Butler,吉田将郎,花栗哲郎,岩佐義宏
    • Organizer
      日本物理学会 2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 1T-TaS_2_における絶縁性の起源2020

    • Author(s)
      C. J. Butler,吉田将郎,花栗哲郎,岩佐義宏
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Mottness versus unit-cell doubling as the driver of the insulating state in 1T-TaS22020

    • Author(s)
      Christopher Butler, Masaro Yoshida, Tetsuo Hanaguri, Yoshihiro Iwasa
    • Organizer
      2020 Annual Meeting of the Physical Society of Taiwan
    • Related Report
      2019 Annual Research Report
  • [Presentation] Three-dimensional stacking of two-dimensional charge density wave layers in Mott insulating 1T-TaS22019

    • Author(s)
      Christopher J. Butler
    • Organizer
      IBS-RIKEN Joint Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 「電子の避け合い」が生む絶縁体を実証

    • URL

      https://www.riken.jp/press/2020/20200518_2/index.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] “Tantalizing” clues about why ...(snip)

    • URL

      https://www.riken.jp/en/news_pubs/research_news/pr/2020/20200518_2/index.html

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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