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The real space observation of non-local electrical conductivity by low temperature scanning tunneling potentiometry

Research Project

Project/Area Number 16K04956
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionThe University of Tokyo

Principal Investigator

Hamada Masayuki  東京大学, 物性研究所, 技術専門職員 (00396920)

Co-Investigator(Kenkyū-buntansha) 長谷川 幸雄  東京大学, 物性研究所, 教授 (80252493)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords走査トンネルポテンショメトリ / 表面状態伝導 / 表面電気伝導 / 表面電位測定 / 走査プローブ顕微鏡 / STP / STM / SPM / 走査トンネルポテンショメトリー / 表面電位分布 / 低温STM
Outline of Final Research Achievements

By introducing STP(scanning tunneling potentiometry) which we have exploited so far to our existing low-temperature scanning tunneling microscopy(LT-STM), we have built the techniques and the devices that were needed for LT-STP (low-temperature scanning tunneling potentiometry) measurements. Then, in order to evaluate the performance, we tried the LT-STP measurements at T=19K with Au thin film formed on an insulating substrate which is a Si substrate covered with Si oxide, and as a result we could obtain the potential images which were consistent with the direction of a lateral current parallel to the surface. This demonstrates the perfect operation of our LT-STP. In addition, we also succeeded in the measurements of STP in the range of T=20-80K with employing the Au thin film.

Academic Significance and Societal Importance of the Research Achievements

表面の電気伝導は、物理的にもデバイス応用の観点からも重要であるが、技術的な難しさのために測定の優先順位が下がりがちである。本研究では、表面電気伝導をナノスケールの空間分解能・マイクロボルトレベルという非常に高い電位分解能で可視化できることが知られている走査トンネルポテンショメトリ(STP)という顕微鏡を開発し、その動作環境を低温下まで拡張し、さらに、T=20-80K程度の温度範囲でも測定することに成功した。
この手法は、低温下で、表面電気伝導の温度依存性を実空間でマッピングできるので、原子欠陥・表面ステップといった局所的な電気伝導特性のメカニズムを探る手段として大いに期待できる。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (13 results)

All 2020 2019 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Si(111)-7×7 表面上の一次元欠陥における電気伝導評価2020

    • Author(s)
      浜田雅之、長谷川幸雄
    • Journal Title

      Vacuum and Surface Science (表面と真空)

      Volume: -

    • NAID

      130007886639

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of one-dimensional defects in the electrical transport through Si(111) - 7×7 surface states2019

    • Author(s)
      Hamada Masayuki, Hasegawa Yukio
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 12 Pages: 1254021-5

    • DOI

      10.1103/physrevb.99.125402

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Surface state conductivity on the Si(111)-7x7 surface measured by scanning tunneling potentiometry2020

    • Author(s)
      Masayuki Hamada, Hung-Hsiang Yang, Yukio Hasegawa
    • Organizer
      The Symposium on Surface and Nano Science 2020 (SSNS'20)(岩手県岩手郡雫石町・雫石プリンスホテル)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 低温走査トンネルポテンショメトリーの開発2019

    • Author(s)
      浜田雅之、Hung-Hsiang Yang,長谷川幸雄
    • Organizer
      応用物理学会(北海道札幌市・北海道大学札幌キャンパス)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Si(111)-(7x7)表面上の一次元線欠陥における電気伝導評価2019

    • Author(s)
      浜田雅之、Hung-Hsiang Yang,長谷川幸雄
    • Organizer
      日本表面真空学会(茨城県つくば市・つくば国際会議場)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Surface state conductivity on the Si(111)-7x7 surface measured by scanning tunneling potentiometry2019

    • Author(s)
      Masayuki Hamada, Hung-Hsiang Yang, Yukio Hasegawa
    • Organizer
      27th International Colloquium on Scanning Probe Microscopy (ICSPM27)(静岡県伊豆市・ホテルラフォーレ修善寺)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurements of the surface conductivity on the Si(111)-7x7 surface by scanning tunneling potentiometry2018

    • Author(s)
      Masayuki Hamada, Hung-Hsiang Yang and Yukio Hasegawa
    • Organizer
      14th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures(宮城県仙台市青葉区・仙台国際センター)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Si(111)-(7x7)表面の走査トンネルポテンショメトリー測定2018

    • Author(s)
      浜田雅之、Hung-Hsiang Yang,長谷川幸雄
    • Organizer
      nanospec2018 (千葉県柏市・東京大学物性研究所)
    • Related Report
      2017 Research-status Report
  • [Presentation] Si(111)-(7x7)表面上の位相境界における電気伝導評価2017

    • Author(s)
      浜田雅之、Hung-Hsiang Yang,長谷川幸雄
    • Organizer
      応用物理学会(福岡県福岡市・福岡国際会議場・国際センター・福岡サンパレス)
    • Related Report
      2017 Research-status Report
  • [Presentation] The observation of the surface conductivity on the Si(111)-7x7 surface by scanning tunneling potentiometry2017

    • Author(s)
      Masayuki Hamada, Hung-Hsiang Yang, Yukio Hasegawa
    • Organizer
      The 8th International Symposium on Surface Science(茨城県つくば市・つくば国際会議場)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] The measurement of the surface conductivity on the Si(111)-7x7 surface by scanning tunneling potentiometry2017

    • Author(s)
      Masayuki Hamada, Hung-Hsiang Yang, Yukio Hasegawa
    • Organizer
      The 5th Ito International Research Conference(東京都文京区・東京大学伊藤国際学術研究センター)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Si(111)-(7x7)表面上の位相境界における電気伝導評価2016

    • Author(s)
      浜田雅之, 長谷川幸雄
    • Organizer
      物性研短期研究会
    • Place of Presentation
      東京大学物性研究所(千葉県柏市)
    • Year and Date
      2016-10-31
    • Related Report
      2016 Research-status Report
  • [Presentation] Si(111)-(7x7)表面上の位相境界における電気伝導評価2016

    • Author(s)
      浜田雅之, 長谷川幸雄
    • Organizer
      応用物理学会
    • Place of Presentation
      朱鷺メッセ(新潟県新潟市中央区)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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