Slitless time-resolved ARPES

2022 Fiscal Year Final Research Report

• Project/Area Number: 19KK0350
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: The University of Tokyo
• Principal Investigator: Ishida Yukiaki 東京大学, 大学院理学系研究科(理学部), 特任講師 (30442924)
• Project Period (FY): 2020 – 2022
• Keywords: 角度分解光電子分光 / 仕事関数 / ファイバーレーザー / 表面第２高調波

Outline of Final Research Achievements

In the ISSP-CCES Joint Research lab located at Seoul National University, we achieved the followings: (1) Two time-resolved ARPES systems developed at ISSP were transferred to the Joint-Research lab; (2) We succeeded in developing a compact femto-fiber laser system that operates in an ordinary laboratory environment; thereby we docket the laser system to a slitless photoelectron analyze and demonstrated a new method by which work function can be measured with a precision better than 1-2 orders of magnitude than conventional methods; (3) By utilizing a slitless analyzer and circularly-polarized laser harmonics, we investigated the circular dichroism in the photoelectron solid angular distribution, and formulated the pattern classification. (4) We developed a compact second harmonic generation detector and observed some novel first-order structural transition occurring in a transition-metal chalcogenide; (4) We developed a compact 1 MHz femto-fiber laser system that operates on a hand.

Free Research Field

固体および固体表面の電子物性

Academic Significance and Societal Importance of the Research Achievements

本課題で得られた成果は、超高速分光学、レーザー技術、材料科学の領域に渡って意義をもち、ISSP-CCESの共同ラボにおけるさらなる国際共同研究を促進する。本研究期間中に開発した小型で汎用性のあるフェムト秒域パルスレーザー光源や装置は、光電子分光に限らず様々な科学・技術分野で進歩とイノベーションを推進すると期待される。