Spin-resolved STM and ARPES studies of spin-nano-physics at surfaces

2016 Fiscal Year Final Research Report

• Project/Area Number: 26287061
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: KOMORI Fumio 東京大学, 物性研究所, 教授 (60170388)
• Co-Investigator(Kenkyū-buntansha): 宮町 俊生 東京大学, 物性研究所, 助教 (10437361) ; 矢治 光一郎 東京大学, 物性研究所, 助教 (50447447)
• Co-Investigator(Renkei-kenkyūsha): SHIN Shik 東京大学, 物性研究所, 教授 (00162785) ; IIMORI Takushi 東京大学, 物性研究所, 技術職員
• Research Collaborator: KOBAYASHI Katsuyoshi お茶の水女子大学, 理学部, 教授 ; ERNST Arthur マックスプランク微細構造研究所, 教授 ; KURODA Kenta 東京大学, 物性研究所, 助教 ; HARASAWA Ayumi 東京大学, 物性研究所, 技術職員
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: スピン分解 / 光電子分光 / 走査トンネル顕微鏡 / トポロジカル表面 / 強磁性 / 原子層

Outline of Final Research Achievements

We have constructed a spin- and angle-resolved photoemission spectrometer using laser light with an energy resolution of 1.7 meV, which is the world best. The spin direction is three-dimensionally detected. By using the constructed spectrometer and the existing spin-resolved scanning tunneling microscopes for the atomic structure imaging and local electron tunneling spectroscopy, we have achieved the following results on the spin-related phenomena at surfaces. (1) spin-polarized surface electronic band structures of the spin-split bands due to strong spin-orbit interaction, of topological insulators and of Weil semimetals, (2)　Control of photoelectron spin direction from spin-polarized surface states by linearly polarized laser light. (3) Local wave functions and magnetism of a few atomic layers of iron nitrides, and (4) Growth and magnetism of fcc iron films with a few atomic layer Mn films.

Free Research Field

表面ナノ構造科学・表面電子状態・表面磁性