Studies on Electronic and Spin Transport at Topological Surfaces and Edge States

2015 Fiscal Year Final Research Report

• Project/Area Number: 25246025
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The University of Tokyo
• Principal Investigator: Hasegawa Shuji 東京大学, 理学(系)研究科(研究院), 教授 (00228446)
• Co-Investigator(Kenkyū-buntansha): TAKAYAMA Akari 東京大学, 大学院理学系研究科, 助教 (70722338) ; AKIYAMA Ryota 東京大学, 大学院理学系研究科, 助教 (40633962) ; HIRAHARA Toru 東京工業大学, 大学院理工学研究科, 准教授 (30451818)
• Research Collaborator: Saranin Alexander Institute of Automation and Control Processes, ロシア科学アカデミー, 教授 ; HOBARA Rei 東京大学, 大学院理学系研究科, 特任研究員 (30568176)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: トポロジカル絶縁体 / ラシュバ効果 / スピン偏極電流 / スピン流 / ラシュバ超伝導 / フォトガルバニック効果 / スピンホール効果 / スピン軌道相互作用

Outline of Final Research Achievements

The present research on transport phenomena at surfaces of strong spin-orbit coupling materials has provided the following results. (1) Direct detection of suppression of back scattering of surface-state carriers on topological insulators. (2) Detection of photogalvanic effect (spin-polarized current induced by irradiation of circularly polarized light) at Rashba-type spin-split surface states. (3) Detection of energy-gap opening in a topological Dirac-cone type state by proximity effect of magnetic material. (4) Detection of spin Hall effect at ultrathin films of topological insulators. (5) Discovery of superconductivity at Rashba-type spin-split surface states. (6) Discovery of superconductivity at Ca-intercalated double-layer graphene.

Free Research Field

表面物理学