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On the photoelectric effect at the edge of matter

Research Project

Project/Area Number 17K18749
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Ishida Yukiaki  東京大学, 物性研究所, 助教 (30442924)

Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywords光電子分光 / 仕事関数 / レーザー / 表面非線形効果 / 光電効果 / 表面光物性 / 非線形光学 / 表面非線形光学
Outline of Final Research Achievements

The advances in the laser and angle-resolved photoemission spectroscopy (ARPES) techniques have enabled us to investigate the low-photon-energy photoelectron emission phenomena in depth. Here, we implemented the platform for low-photon-energy ARPES, and demonstrated a new method to measure the work function at the unprecedented precision. (1) We open-accessed a software to map the photoelectron distribution to the Bloch-electron distribution. The software is compatible to the data recorded with“slit-less” analyzers. (2) We developed a compact and versatile 6-eV fiber-laser source. The foot print is 50x56cm2 and operates stably for > 3 months in an ordinary laboratory environment. (3) We found a new method to measure the work function at the unprecedented precision of 1 meV. By using the compact source, we found a phenomenon that the slow end of the photoelectron distribution depends on the emission angle of photoelectrons, which can be utilized for the high-precision measurement.

Academic Significance and Societal Importance of the Research Achievements

仕事関数は固体内から電子を一つ取り出すための最小のエネルギーがである。1905年にアインシュタインは「光子のエネルギーが仕事関数を超えると固体から光電子が放出する」と提唱した。この理論によれば最も遅い光電子が存在するはずである。ところが遅い光電子を精度よく捉えることが技術的に難しかったため、その素性はよくわかっていなかった。本研究ではレーザーと光電子分光の技術の高度化を図り、最も遅い光電子の放出角依存性を捉えることに世界で初めて成功した。その結果、最も遅い光電子は表面垂直方向にの

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (3 results)

All 2019 2018

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

  • [Journal Article] Functions to map photoelectron distributions in a variety of setups in angle-resolved photoemission spectroscopy2018

    • Author(s)
      Y. Ishida, S. Shin
    • Journal Title

      Review of Scientific Instruments

      Volume: 89 Issue: 4

    • DOI

      10.1063/1.5007226

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 時間分解光電子分光法によるトポロジカル相の分類と光機能化2018

    • Author(s)
      石田行章、辛埴
    • Journal Title

      固体物理

      Volume: 53 Pages: 233-248

    • NAID

      40021577468

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] “Slit-less” ARPES analyzers: Some utilities and prospects in surface photo-electronics2019

    • Author(s)
      Y. Ishida
    • Organizer
      Momentum Microscopy & Spectroscopy for Materials Science
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited

URL: 

Published: 2017-07-21   Modified: 2020-03-30  

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