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量子点接触中的自旋过滤特性 被引量:2

Spin filtering properties in the quantum point contact
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摘要 利用可调节自旋过滤器模型,计算并讨论了磁场和电子跃迁能量间隔变化对量子点接触结构中自旋电子过滤特性的影响。研究发现,磁场和电子跃迁能量间隔的变化引起了自旋电子隧穿概率和隧穿电导都呈现出量子台阶效应,磁场的增加使电子的回旋频率和Zeeman能级分裂同时加强,从而导致量子点接触结构中的横向约束加强,而自旋过滤效应明显减弱;当磁场一定时,电子跃迁能量间隔越小,电子的自旋过滤效应越明显。电子跃迁能量间隔改变的同时,也改变了鞍形势的势垒形状和自旋过滤的灵敏度。对于不同的材料,同时考虑磁场和电子跃迁能量间隔的作用可以找到自旋过滤器的最佳过滤效果。尤为重要的是过滤器的结构用标准的电子束技术很容易得到,所以研究结论为设计新型自旋过滤器提供了理论依据,具有广阔的应用前景和潜在的商业价值。此外,使用朗道因子值较高的材料作自旋过滤器的衬底,可以进一步提高过滤器的性能。 By using the adjustable spin filtering model, effect of the magnetic field and electron transition energy interval change on the spin electron filtering properties was calculated and discussed firstly. It's found that the changing of the magnetic field and electron transition energy interval cause the electron tunneling probability and tunneling conductance to show the quantum step effect. As the magnetic field increasing the electron cyclotron frequency and Zeeman energy levels splitting were strengthened at the same time Then the transverse binding force was strengthened in the quantum point contact, while the spin filtering effect was weakened. When the magnetic field is given, the electron transition energy interval is smaller, and the spin filtering effect is much more obvious. Consequently, as the electron transition energy is changed, shape of the saddle-like potential and spin filtering sensitivity are changed too. For different materials, the role of both the magnetic field and electron transition energy interval were considered to find the best spin filtering result. More importantly, the quantum point contact structure can be easy acquired through the standard electron beam technique, so the results give the theoretical support for designing new spin filtering devices with application prospects and the potentially commercial value. Morover, if the spin filter substrate is fabricated by use of the high Landau factor materials, the spin filter performance can be further improved.
出处 《量子电子学报》 CAS CSCD 北大核心 2013年第4期495-500,共6页 Chinese Journal of Quantum Electronics
关键词 量子光学 量子点接触 自旋过滤器 鞍形势 量子电导 quantum optics quantum point contact spin filter saddle-like potential quantum conductance
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  • 1苏晓琴,郭光灿.量子通信与量子计算[J].量子电子学报,2004,21(6):706-718. 被引量:62
  • 2Safari E. Influence of the laser-diode temperature on crystal absorpton and output power [J]. Physics, 2011, 76(1): 119.
  • 3Chun Yushang, Hui Kang, Hong Bojiang, et al. Introduction of cooperating conductive components into the phosphor to improve the low voltage cathodoluminescence [J]. Journal of Luminescence, 2013, 138: 182.
  • 4SunJY,DuHY,HuWX.SolidLuminescentMaterials(固体发光材料)[M].Beijing:ChemicalIndustryPress,2003(inChinese).
  • 5Ye T, Zhao G, Zhang W, et aI. Preparation of nanoscal rear-earth luminescence particles by a novel method [J]. Res. Bull., 1997, 32: 501.
  • 6FangJX,DongL.SolidStatePhysics(固体物理学)[M].Shanghai:ShanghaiScientificandTechnicalPress,1981(inChinese).
  • 7Shang C Y, Shang X H, Qu Y Q, et al. Quenching mechanisms of the optical centers in Eu^3+-doped nanophos- phors under charge transfer excitation [J]. AppI. Phys., 2010, 108: 79.
  • 8陈泉.半导体量子电子和光电子器件[J].城市建设理论研究(电子版),2015,5(27):1484-1485.
  • 9周惠平,王晓梅,张杨等.促进科技期刊科学发展的路径——以《量子电子学报》发展为例[C].2014:218-220.
  • 10张子良,提汝芳,黄腾,王颖萍,丁蕾,郑海洋,方黎.气溶胶单粒子光谱的PLS聚类分析[J].量子电子学报,2012,29(1):106-113. 被引量:7

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