Spin control via near-field optomagnetic effects

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13705
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Optical engineering, Photon science
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: OGAWA NAOKI 国立研究開発法人理化学研究所, 創発物性科学研究センター, ユニットリーダー (30436539)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: スピン偏極光電流

Outline of Final Research Achievements

We aimed at detecting the transverse spin moment of optical near-field, by detecting the spin-polarized photocurrent in the adjacent materials having large spin-split electronic states. We used SiO2 prisms to prepare the optical near-field with varying spin states, and employed cleaved crystals of BiTeBr, single crystalline films of (Bi,Sb)2Te3, and single crystals of CdSe as detectors with spin-split band structures. It is found that a flat exposed surface with a large spin-splitting is crucial to realize this experiment. The (Bi,Sb)2Te3 films may have potentials after an appropriate cryostat modification, to finely control the distance between the film and prism surface.

Free Research Field

光物性