Few-spin physcis in lateral quantum dots in near-zero magnetic field regime

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K13867
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Osaka University
• Principal Investigator: Fujita Takafumi 大阪大学, 産業科学研究所, 准教授 (00809642)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 量子ドット / 量子情報処理 / 半導体 / スピン制御 / 光励起

Outline of Final Research Achievements

In this research project, we have developed a new device that confines single electrons and single holes. This allows us to control electrons and holes at very close distances, leading to the realization of new quantum dot devices. We aim to initialize spins by confining optically excited spins, and have conducted electromagnetic field simulations of the device structures while establishing high-precision electrode fabrication techniques. Additionally, we are aiming for spin manipulation at low magnetic fields and have demonstrated each foundational technology. These achievements are expected to lead to the realization of the aimed applications.

Free Research Field

半導体量子ドット中の電子スピン

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、学術的には新しい量子ドットデバイスを実現し、量子情報処理や通信の分野での応用が期待されます。従来、半導体中の量子情報キャリアは電子か正孔の片方のみの制御でしたが、本研究では両方のキャリアの制御や光との結合を目指し、磁場不要で高温での動作を目指しています。これにより、汎用性の高い複合的なデバイスの開発が促進され、情報技術やセキュリティー、ナノスケールのセンシングなど社旗への貢献が期待されます。