Development of ultralow temperature and ultrahigh-resolution laser-based photoemission spectroscopy and investigation of the mechanism of exotic superconductors

2017 Fiscal Year Final Research Report

• Project/Area Number: 25220707
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: SHIN SHIK 東京大学, 物性研究所, 教授 (00162785)
• Co-Investigator(Kenkyū-buntansha): 石田 行章 東京大学, 物性研究所, 助教 (30442924) ; 近藤 猛 東京大学, 物性研究所, 准教授 (40613310) ; 岡崎 浩三 東京大学, 物性研究所, 准教授 (40372528)
• Project Period (FY): 2013-05-31 – 2018-03-31
• Keywords: 光電子分光 / レーザー / 超電導 / 超低温 / 高分解能

Outline of Final Research Achievements

The main purpose in our project is to develop angle-resolved photoelectron spectroscopy (ARPES) which achieves the minimum temperature less than 1K and the highest energy-resolution not reached before, and elucidate the mechanism of unconventional low-temperature superconductors. We have developed the state-of-the-art ARPES equipped with He3 cryostat, which enables an extremely low temperatures less than 1K. We have also developed measurement software which incorporates a photoelectric analyzer and a sCMOS-type camera (not a conventional CCD camera) to allow measurements at a high-speed frame rate. We have demonstrated that an iron-based superconductor is a topological superconductor. In addition, we have succeeded in observation of detailed superconducting gaps in the spin polarization band for the topological material grown as a film on a bulk superconductor.

Free Research Field

電子物性