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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 |
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 |
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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.
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Received: 24 October 2014
Revised: 05 December 2014
Accepted manuscript online:
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PACS:
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73.21.La
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(Quantum dots)
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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73.50.Lw
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(Thermoelectric effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61274101). |
Corresponding Authors:
Chi Feng
E-mail: chifeng@bhu.edu.cn
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| About author: 73.21.La; 72.15.Jf; 73.50.Lw |
Cite this article:
Bai Xu-Fang (白絮芳), Sun Lian-Liang (孙连亮), Chi Feng (迟锋) Heat generation by spin-polarized current in a quantum dot connected to spin battery and ferromagnetic lead 2015 Chin. Phys. B 24 057302
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