Electronic states of novel functional materials studied by ultrahigh-resolution three-dimensional spin- and angle-resolved photoemission spectroscopy

2014 Fiscal Year Final Research Report

• Project/Area Number: 23224010
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: TAKAHASHI Takashi 東北大学, 原子分子材料科学高等研究機構, 教授 (00142919)
• Co-Investigator(Kenkyū-buntansha): SATO Takafumi 東北大学, 大学院理学研究科, 准教授 (10361065) ; SOUMA Seigo 東北大学, 原子分子材料科学高等研究機構, 准教授 (20431489)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: スピン分解光電子分光 / トポロジカル絶縁体 / スピントロニクス / 鉄系高温超伝導体

Outline of Final Research Achievements

We have constructed an ultrahigh-resolution three-dimensional spin- and angle-resolved photoemission spectrometer to elucidate the electronic states of novel functional materials such as spintronics-related materials. By developing a three-dimensional spin detector based on the very-low-energy-electron-diffraction method, we have obtained spin-resolved photoemission intensity two-orders-of-magnitude higher than that of the previous spin-resolved system. We have also achieved the energy resolution of 5 meV in the spin-resolved ARPES measurement, which is the world best at present. By using this spin-resolved system as well as synchrotron radiation, we have performed ARPES measurements on novel functional materials such as topological insulators, Rashba metals, and iron-based superconductors. We have succeeded in directly determining the fine electronic states in the vicinity of Fermi level responsible for the anomalous physical properties and novel quantum phenomena.

Free Research Field

数物系科学