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

Hui Yao, Peng-Bin Niu, Chao Zhang, Wei-Ping Xu, Zhi-Jian Li and Yi-Hang Nie ()
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Hui Yao: Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University
Peng-Bin Niu: Institute of Solid State Physics, Shanxi Datong University
Chao Zhang: Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University
Wei-Ping Xu: School of Applied Science, Taiyuan University of Science and Technology
Zhi-Jian Li: Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University
Yi-Hang Nie: Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 3, 1-7

Abstract: Abstract 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 non-collinear configuration 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.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-80552-8

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