2023 Fiscal Year Final Research Report

Optical spin-functional transistor

Research Project

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Project/Area Number	20K20433
Project/Area Number (Other)	19H05507 (2019)
Research Category	Grant-in-Aid for Challenging Research (Pioneering)
Allocation Type	Multi-year Fund (2020) Single-year Grants (2019)
Review Section	Medium-sized Section 21:Electrical and electronic engineering and related fields
Research Institution	Hokkaido University
Principal Investigator	Murayama Akihiro 北海道大学, 情報科学研究院, 教授 (00333906)
Project Period (FY)	2020-04-01 – 2024-03-31
Keywords	光スピントランジスタ / 電界効果 / 半導体量子ドット / 二次元電子系 / 希薄窒化物半導体 / スピンフィルタリング増幅
Outline of Final Research Achievements	Solving energy loss is an issue in electronic information and optical communications supporting the information society. Therefore, it is important to conduct research that utilizes and integrates electron spin memory and optoelectronics, which can suppress power consumption. Circularly polarized light is a spin state of light, which can be mutually converted to the spin state of electrons during photoelectric conversion such as light absorption and emission in compound semiconductors such as GaAs. In order to explore new optical spin functions, a field-effect optical spin transistor was studied, where the spin-polarized state of electrons generated by circularly polarized light input can be controlled by an external electric field, and the output will be circularly polarized luminescence. As a result, electric field control of spin polarization information has been realized at room temperature, which is important for practical use.
Free Research Field	半導体光スピントロニクス
Academic Significance and Societal Importance of the Research Achievements	現代の高度な情報社会を支える電子情報や光通信では、エネルギー熱損失の解決が課題であり、消費電力を抑制できる電子スピンメモリと光エレクトロニクスを活用し融合する研究が重要で、社会的な意義も大きい。そこで、新しい光スピン機能の開拓に向けて、円偏光の入力により生成する電子のスピン偏極状態を外部電界により制御し円偏光発光として出力する、電界効果型の光スピントランジスタを研究した。通常は磁場にのみ応答する半導体中の電子のスピン状態を電界だけで制御するデバイスの研究は、学問的にも意義は大きい。その結果、実用上必須の室温で、電子スピンや円偏光特性の偏り度合いで与えられるスピン偏極情報の電界制御を実現した。