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

作　　者：白絮芳 孙连亮 迟锋 

机构地区：[1]College of Physics and Electronic Information, Inner Mongolia National University [2]College of Science, North China University of Technology [3]School of Physical Science and Technology, Inner Mongolia University [4]College of Engineering, Bohai University

出　　处：《Chinese Physics B》2015年第5期523-528,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.61274101)

摘　　要：We study theoretically the heat originated from electron-phonon coupling in a spintronic device composed of a semi- conductor 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.We study theoretically the heat originated from electron-phonon coupling in a spintronic device composed of a semi- conductor 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 

分 类 号：O471.1[理学—半导体物理]