Detection of pure spin current in topological insultors by using the inverse spin Hall effect

2014 Fiscal Year Final Research Report

• Project/Area Number: 25600076
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: Kyoto University
• Principal Investigator: SHIRAISHI Masashi 京都大学, 工学(系)研究科(研究院), 教授 (30397682)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: トポロジカル絶縁体 / スピン偏極状態 / スピン運動量ロッキング

Outline of Final Research Achievements

We have selected BiSeTeSe, the bulk-insulative 3-dimensional topological insultor, as a model material of my experiment. The purpose of my study is to detect a surface spin-polarized state ascribed to the spin-momentum locking. Although the experimental procedure was changed from the planned procedure, I have successfully detected the surface spin polarization up to 150 K. This is the first experimental demonstration of the detection using BiSbTeSe, and the detail of the results was described in a paper, which was published in Nano Letters (an ACS journal, the impact factor is 12.9). My result has been attracting much interest.

Free Research Field

固体物理