Thermoelectric efficiency enhanced in a quantum dot with polarization leads, spin-flip and external magnetic field

被引：2
|
作者：
Yao, Hui [1 ]
Niu, Peng-Bin [2 ]
Zhang, Chao [1 ]
Xu, Wei-Ping [3 ]
Li, Zhi-Jian [1 ]
Nie, Yi-Hang [1 ]
机构：
[1] Shanxi Univ, Inst Theoret Phys, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Shanxi, Peoples R China
[2] Shanxi Datong Univ, Inst Solid State Phys, Datong 037009, Peoples R China
[3] Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL B | 2018年 / 91卷 / 03期
基金：
中国国家自然科学基金;
关键词：
TRANSPORT; OSCILLATIONS; THERMOPOWER;
D O I：
10.1140/epjb/e2018-80552-8
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We theoretically study the thermoelectric transport properties in a quantum dot system with two ferromagnetic leads, the spin-flip scattering and the external magnetic field. The results show that the spin polarization of the leads strongly influences thermoelectric coefficients of the device. For the parallel configuration the peak of figure of merit increases with the increase of polarization strength and noncollinear con figuration trends to destroy the improvement of figure of merit induced by lead polarization. While the modulation of the spin-flip scattering on the figure of merit is effective only in the absence of external magnetic field or small magnetic field. In terms of improving the thermoelectric efficiency, the external magnetic field plays a more important role than spin-flip scattering. The thermoelectric efficiency can be significantly enhanced by the magnetic field for a given spin-flip scattering strength.
引用
收藏
页数：7
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