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Generating and reversing spin accumulation by temperature gradient in a quantum dot attached to ferromagnetic leads
  • ISSN号:1674-1056
  • 期刊名称:《中国物理B:英文版》
  • 时间:0
  • 分类:O471.1[理学—半导体物理;理学—物理] TG244.3[金属学及工艺—铸造]
  • 作者机构:[1]College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China, [2]College of Engineering, Bohai University, dinzhou 121013, China, [3]SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • 相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 10704011), the SKLSM, China (Grant No. CHJG200901), and the LNET, China (Grant No. 2009R01).
中文摘要:

We propose to generate and reverse the spin accumulation in a quantum dot (QD) by using the temperature difference between the two ferromagnetic leads connected to the dot. The electrons are driven purely by the temperature gradient in the absence of an electric bias and a magnetic field. In the Coulomb blockade regime, we find two ways to reverse the spin accumulation. One is by adjusting the QD energy level with a fixed temperature gradient, and the other is by reversing the temperature gradient direction for a fixed value of the dot level. The spin accumulation in the QD can be enhanced by the magnitudes of both the leads’ spin polarization and the asymmetry of the dot-lead coupling strengths. The present device is quite simple, and the obtained results may have practical usage in spintronics or quantum information processing.

英文摘要:

We propose to generate and reverse the spin accumulation in a quantum dot (QD) by using the temperature difference between the two ferromagnetic leads connected to the dot. The electrons are driven purely by the temperature gradient in the absence of an electric bias and a magnetic field. In the Coulomb blockade regime, we find two ways to reverse the spin accumulation. One is by adjusting the QD energy level with a fixed temperature gradient, and the other is by reversing the temperature gradient direction for a fixed value of the dot level. The spin accumulation in the QD can be enhanced by the magnitudes of both the leads' spin polarization and the asymmetry of the dot-lead coupling strengths. The present device is quite simple, and the obtained results may have practical usage in spintronics or quantum information processing.

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期刊信息
  • 《中国物理B:英文版》
  • 中国科技核心期刊
  • 主管单位:中国科学院
  • 主办单位:中国物理学会和中国科学院物理研究所
  • 主编:欧阳钟灿
  • 地址:北京 中关村 中国科学院物理研究所内
  • 邮编:100080
  • 邮箱:
  • 电话:010-82649026 82649519
  • 国际标准刊号:ISSN:1674-1056
  • 国内统一刊号:ISSN:11-5639/O4
  • 邮发代号:
  • 获奖情况:
  • 国内外数据库收录:
  • 被引量:406