| T型量子点结构中的自旋极化输运过程 |
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| 引用本文： | 黄睿,吴绍全. T型量子点结构中的自旋极化输运过程[J]. 低温物理学报, 2010, 32(4) |
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| 作者姓名： | 黄睿 吴绍全 |
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| 作者单位： | 西南石油大学理学院,四川南充,637001;四川师范大学物理与电子工程学院,成都,610066 |
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| 基金项目： | 西南石油大学校级科技基金(青年基金)资助的课题 |
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| 摘 要： | 我们利用单杂质Anderson模型及运动方程等理论,通过求解格林函数的方法研究了通过T型量子点结构(耦合于铁磁电极和介观环量子点结构)的自旋极化输运过程.研究结果表明,与量子点相耦合的铁磁电极中的极化强度是控制量子点电子输运的重要参数,由此可以达到自旋阀效应.另外我们还发现与量子点相耦合的介观环中的磁通会影响电子自旋向上和自旋向下近藤共振峰的分裂程度,但若加入适当的外磁场,那么这样的分裂将被抵消。
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| 关 键 词： | 单量子点 近藤效应 态密度 |
SPIN-POLARIZED TRANSPORT THROUGH T-SHAPEDQUANTUM DOT SYSTEM |
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| HUANG Rui WU Shao-quan College of Sciences,Southwest Petroleum University,Nanchong,College of Physics , Electronic Engineering,Sichuan Normal University,Chengdu. SPIN-POLARIZED TRANSPORT THROUGH T-SHAPEDQUANTUM DOT SYSTEM[J]. Chinese Journal of Low Temperature Physics, 2010, 32(4) |
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| Authors: | HUANG Rui WU Shao-quan College of Sciences Southwest Petroleum University Nanchong College of Physics Electronic Engineering Sichuan Normal University Chengdu |
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| Affiliation: | HUANG Rui1 WU Shao-quan2 1College of Sciences,Southwest Petroleum University,Nanchong637001,2College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu610068 |
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| Abstract: | Using the single impurity Anderson model and equation of motion technique to solve the Green function,we investigate spin-polarized transport throughT-shaped quantum dot system(aquantum dot coupled to ferromagnetic leads and a mesoscopic ring).In this letter we show that the magnetic polarization in the ferromagnetic leads coupled to a quantum dot is the important parameter to control electron transport in quantum dot,which can be used to generate a spin-valve effect.At the same time,we find that the magnet... |
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| Keywords: | Quantum dot Kondo effect Density of states |
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