Spin Torque Effect in Mesoscopic Systems

介观系统中的自旋扭矩效应

• 批准号: 21540320
• 负责人: HATTORI Kiminori
• 金额: $ 1.91万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21540320/
• 关键词: スピントルク; メゾスコピック系; スピントロニクス; スピンポンピング; 量子スピンホール効果; スピン輸送; 量子細線; 磁性不純物; 磁気的乱れ; エッジ状態; スピンカレント; スピン軌道結合; 量子ドット; スピンボンピング

Spintronics is a burgeoning field in condensed matter physics which aims to harness electron spin in addition to charge in solid-sate systems. Many ideas for achieving this goal have been proposed to date. Among these, spin torque effect and spin Hall effect in mesoscopic systems are extensively investigated in this study. We obtain the following important results. The spin torque effect occurring in Rashba spin-orbit(SO) coupled systems efficiently produces a pure spin current which is orders of magnitude larger than ordinary spin Hall currents. Reflecting time evolution of spin state, a Rabi oscillation is exhibited in transient spin current pumped from a ESR-driven quantum dot. Helical edge states are formed in a harmonic quantum wire due to the SO interaction induced by lateral confinement, yielding the quantum spin Hall(QSH) effect. Quantized charge transport in the QSH system is destroyed by any weak magnetic disorder, whereas quantized and conserved spin transport survives magnetic disorder as long as bulk insulating gap remains intact.

Spintronics是凝聚态物理学中新兴的领域，其目的是利用电子自旋，除了在固态系统中充电。迄今为止，已经提出了许多实现这一目标的想法。其中，在本研究中广泛研究了介质系统中的自旋扭矩效应和自旋霍尔效应。我们获得以下重要结果。在Rashba自旋轨道（SO）耦合系统中发生的自旋扭矩效应有效地产生纯自旋电流，该电流比普通的自旋大厅电流大。反映自旋态的时间演变，在从ESR驱动的量子点泵送的瞬态自旋电流中表现出RABI振荡。螺旋边缘状态由于横向限制引起的SO相互作用而形成谐波量子线，产生了量子自旋大厅（QSH）效应。 QSH系统中的量化电荷传输会被任何弱磁性障碍破坏，而量化和保守的自旋运输将存活磁性障碍，只要散装绝缘间隙保持完整。

项目成果

量子細線の量子スピンホール効果

量子线中的量子自旋霍尔效应

• 发表时间: 2011
• 作者: K.Sato;H.Murakami;K.Ito;K.Hirata;Y.Kobayashi;服部公則
• 通讯作者: 服部公則

Quantum Spin-Hall Effect, in a Quantum Wire

量子线中的量子自旋霍尔效应

• 发表时间: 2010
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: Sergiy V.Divinski;Jens Ribbe;Dietmar Baither;Guido Schmitz;Gerrit Reglitz;Harald Rosner;Kiminori Sato;Yuri Estrin;Gerhard Wilde;Kiminori Hattori;安食博志;Kiminori Hattori
• 通讯作者: Kiminori Hattori

Spin Current Generated from a Quantum Dot Driven by Pulsed Magnetic Resonance : Real-Time Spin Dynamics

脉冲磁共振驱动的量子点产生的自旋电流：实时自旋动力学

• 发表时间: 2010
• 期刊: Journal of the Physical Society of Japan, Virtual Journal of Nanoscale Science & Technology, American Institute of Physics and American Physical Society
• 作者: K. Ito;T. Oka;Y. Kobayashi;Y. Shirai;K. Wada;M. Matsumoto;M. Fujinami;T. Hirade;Y. Honda;H. Hosomi;Y. Nagai;K. Inoue;H. Saito;K. Sakaki;K. Sato;A. Shimazu;and A. Uedono;安食博志;Kiminori Hattori
• 通讯作者: Kiminori Hattori

Spin-Current-Driven Spin Pumping in Rashba Spin-Orbit Coupled Systems : A Spin Torque Effect

• DOI: 10.1143/jpsj.78.084703
• 发表时间: 2009-07
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: K. Hattori

Quantized Spin Transport in Magnetically-D isordered Quantum Spin Hall Systems

磁D无序量子自旋霍尔系统中的量子化自旋输运

• DOI: 10.1143/jpsj.80.124712
• 发表时间: 2011
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: K. Sato;H. Murakami;K. Fujimoto;M. Nakata;and Y. Kobayashi;Kiminori Hattori
• 通讯作者: Kiminori Hattori