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

Research Project

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
Project Status	Completed (Fiscal Year 2014)
Budget Amount *help	¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000) Fiscal Year 2014: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000) Fiscal Year 2013: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000) Fiscal Year 2012: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywords	半導体核スピン / 量子ホール効果 / 低次元電子系 / 物性実験 / 半導体物性 / 低温物性 / 量子閉じ込め / スピンエレクトロニクス / 量子ドット
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.

Report

(4 results)