中国物理B ›› 2015, Vol. 24 ›› Issue (5): 57302-057302.doi: 10.1088/1674-1056/24/5/057302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Heat generation by spin-polarized current in a quantum dot connected to spin battery and ferromagnetic lead

白絮芳a, 孙连亮b, 迟锋c d   

  1. a College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China;
    b College of Science, North China University of Technology, Beijing 100041, China;
    c School of Physical Science and Technology, Inner Mongolia University, Huhehaote 010023, China;
    d College of Engineering, Bohai University, Jinzhou 121013, China
  • 收稿日期:2014-10-24 修回日期:2014-12-05 出版日期:2015-05-05 发布日期:2015-05-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61274101).

Heat generation by spin-polarized current in a quantum dot connected to spin battery and ferromagnetic lead

Bai Xu-Fang (白絮芳)a, Sun Lian-Liang (孙连亮)b, Chi Feng (迟锋)c d   

  1. a College of Physics and Electronic Information, Inner Mongolia National University, Tongliao 028043, China;
    b College of Science, North China University of Technology, Beijing 100041, China;
    c School of Physical Science and Technology, Inner Mongolia University, Huhehaote 010023, China;
    d College of Engineering, Bohai University, Jinzhou 121013, China
  • Received:2014-10-24 Revised:2014-12-05 Online:2015-05-05 Published:2015-05-05
  • Contact: Chi Feng E-mail:chifeng@bhu.edu.cn
  • About author:73.21.La; 72.15.Jf; 73.50.Lw
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61274101).

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摘要：

We study theoretically the heat originated from electron–phonon coupling in a spintronic device composed of a semiconductor quantum dot attached to one spin battery and one ferromagnetic lead. It is found that the phenomenon of the negative differential of the heat current, which has previously been predicted in the charge-based device, disappears due to the Pauli exclusion principle resulted from the presence of the spin battery. Under some conditions, huge heat in the heat generation induced by resonant phonon emitting processes also disappears in this spin-based device. Furthermore, we find that the ferromagnetism of the lead can be used to effectively adjust the magnitude of the heat current in different dot level ranges. The proposed system is realizable by current technology and may be useful in designing high-efficiency spintronic components.

关键词: quantum dot, heat generation, spin battery, ferromagnetic lead

Abstract:

We study theoretically the heat originated from electron–phonon coupling in a spintronic device composed of a semiconductor quantum dot attached to one spin battery and one ferromagnetic lead. It is found that the phenomenon of the negative differential of the heat current, which has previously been predicted in the charge-based device, disappears due to the Pauli exclusion principle resulted from the presence of the spin battery. Under some conditions, huge heat in the heat generation induced by resonant phonon emitting processes also disappears in this spin-based device. Furthermore, we find that the ferromagnetism of the lead can be used to effectively adjust the magnitude of the heat current in different dot level ranges. The proposed system is realizable by current technology and may be useful in designing high-efficiency spintronic components.

Key words: quantum dot, heat generation, spin battery, ferromagnetic lead

中图分类号:  (Quantum dots)

  • 73.21.La
72.15.Jf (Thermoelectric and thermomagnetic effects) 73.50.Lw (Thermoelectric effects)