Electrical detection of nuclear spin polarization in low-dimensional electron systems baesd on semiconductors

2014 Fiscal Year Final Research Report

• Project/Area Number: 24340065
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: MACHIDA Tomoki 東京大学, 生産技術研究所, 准教授 (00376633)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 半導体核スピン / 量子ホール効果 / 低次元電子系

Outline of Final Research Achievements

We fabricated AlGaAs/GaAs Hall-bar devices and conducted pump&probe detection of nuclear spin polarization in two-dimensional electron gas under even filling quantum Hall regime. We detected dynamic nuclear polarization by measuring hysteresis of current-voltage characteristics. The results suggest that nuclear spin can be electrically polarized by breakdown of even filling quantum Hall effect. We also detected dynamic nuclear polarization in quantum point contact system under Kondo effect regime.

Free Research Field

固体物性